fix

* Fixed typo in message

* Fixed typo in message

.gitignore

@@ -1,7 +1,7 @@
 .idea/*
 .idea/codeStyleSettings.xml
 .temp/*
-composer.lock
+/composer.lock
 /vendor/
 coverage.xml
 .phpunit.result.cache

CLAUDE.md

@@ -0,0 +1,34 @@
+# CLAUDE.md
+
+**Do not edit this file.** Agents must never add, remove, or reword anything here. If a change seems needed, say so and let a human do it.
+
+## Ask before testing
+
+When asked to review code or build a feature, do not run the test suite and do not write new tests. Make the change, report it, then ask the user whether tests should be added — describing the tests you have in mind — and wait for the user to confirm.
+
+Two reasons this matters here: the suite takes minutes, and `tests/.snapshots/success.txt` plus the tally in `tests/Visual/Parallel.php` encode the whole suite's result, so a single added test breaks both.
+
+Once the user confirms:
+
+```bash
+composer test:unit         # fast, excludes the visual group
+composer test:integration  # visual and snapshot tests
+composer test              # everything CI runs, in CI's order
+composer update:snapshots  # only when a test was added or removed
+```
+
+## TIA scenario tests
+
+`tests/Features/Tia/*` scaffold a throwaway git project, run a real `pest` subprocess against it, and diff the TIA graph it wrote. They exist because TIA's contract is about what a run *writes* — replay, branch keys, and the COMPLETE / RESULTS-ONLY / HARD-SUPPRESSED tiers are invisible to ordinary assertions, and every case used to be measured by hand against a playground app.
+
+Add one whenever a change touches branch resolution, replay, filtered mode, or the write tiers. How:
+
+- `Project::make('master')` scaffolds; `seed('master')` writes a graph and sentinels every cached result (`time=9.999`, `assertions=42`) so any rewrite shows up.
+- `$project->pest('--tia', …)` runs it; `$project->delta()` compares against that snapshot. `writtenCount()` is the discriminator — `0` means "replayed", not "wrote the same values". `mutateGraph()` bends one entry; overlays in `tests/Fixtures/Tia/overlays/<name>/` supply a different `tests/Pest.php`.
+- Keep expectations driver-independent: a cold recording run needs pcov/xdebug and behaves differently without one. Seed a graph instead of recording one.
+
+Run them by file (a directory argument finds nothing) or by `--filter`:
+
+```bash
+php bin/pest tests/Features/Tia/PartialRunWriteTier.php
+```

README.md

@@ -35,6 +35,7 @@ We cannot thank our sponsors enough for their incredible support in funding Pest
 - **[SerpApi](https://serpapi.com/?ref=nunomaduro)**
 - **[Typesense](https://typesense.org/?ref=nunomaduro)**
 - **[Bento](https://bentonow.com/?ref=nunomaduro)**
-- **[Redberry](https://redberry.international/laravel-development/)**
+- **[Pixel](https://wearepixel.com.au/?ref=nunomaduro)**
+- **[Redberry](https://redberry.international/laravel-development/?ref=nunomaduro)**
 
 Pest is an open-sourced software licensed under the **[MIT license](https://opensource.org/licenses/MIT)**.

composer.json

@@ -23,7 +23,7 @@
         "nunomaduro/termwind": "^2.4.0",
         "pestphp/pest-plugin": "^5.0.0",
         "pestphp/pest-plugin-arch": "^5.0.0",
-        "pestphp/pest-plugin-mutate": "^5.0.0",
+        "pestphp/pest-plugin-mutate": "^5.0.1",
         "pestphp/pest-plugin-profanity": "^5.0.0",
         "phpunit/phpunit": "^13.2.6",
         "symfony/process": "^8.1.0"
@@ -48,6 +48,7 @@
             "Tests\\Fixtures\\Covers\\": "tests/Fixtures/Covers",
             "Tests\\Fixtures\\Inheritance\\": "tests/Fixtures/Inheritance",
             "Tests\\Fixtures\\Arch\\": "tests/Fixtures/Arch",
+            "Tests\\Fixtures\\Tia\\": "tests/Fixtures/Tia",
             "Tests\\": "tests/PHPUnit/"
         },
         "classmap": [
@@ -58,12 +59,11 @@
         ]
     },
     "require-dev": {
-        "laravel/pao": "^1.1.3",
         "pestphp/pest-dev-tools": "^5.0.0",
         "pestphp/pest-plugin-browser": "^5.0.0",
         "pestphp/pest-plugin-phpstan": "^5.0.0",
-        "pestphp/pest-plugin-rector": "^5.0.0",
+        "pestphp/pest-plugin-rector": "^5.0.2",
-        "pestphp/pest-plugin-type-coverage": "^5.0.0",
+        "pestphp/pest-plugin-type-coverage": "^5.0.2",
         "psy/psysh": "^0.12.24"
     },
     "minimum-stability": "dev",
@@ -71,6 +71,7 @@
     "config": {
         "sort-packages": true,
         "preferred-install": "dist",
+        "process-timeout": 0,
         "allow-plugins": {
             "pestphp/pest-plugin": true
         }
@@ -94,6 +95,7 @@
         "test:inline": "php bin/pest --configuration=phpunit.inline.xml",
         "test:parallel": "php bin/pest --exclude-group=integration --parallel --processes=3",
         "test:integration": "php bin/pest --group=integration -v",
+        "test:tia": "php bin/pest --group=tia -v",
         "update:snapshots": "REBUILD_SNAPSHOTS=true php bin/pest --update-snapshots",
         "test": [
             "@test:lint",

overrides/Runner/TestSuiteLoader.php

@@ -90,11 +90,11 @@ final class TestSuiteLoader
         (static function () use ($suiteClassFile) {
             try {
                 include_once $suiteClassFile;
+
+                TestSuite::getInstance()->tests->makeIfNeeded($suiteClassFile);
             } catch (Throwable $e) {
                 Panic::with($e);
             }
-
-            TestSuite::getInstance()->tests->makeIfNeeded($suiteClassFile);
         })();
 
         $loadedClasses = array_values(

phpunit.xml

@@ -18,8 +18,9 @@
       <directory suffix=".php">./tests</directory>
       <directory suffix=".php">./tests-external</directory>
       <exclude>./tests/.snapshots</exclude>
-      <exclude>./tests/.tests</exclude>
       <exclude>./tests/Fixtures/Inheritance</exclude>
+      <exclude>./tests/Fixtures/Suites</exclude>
+      <exclude>./tests/Fixtures/Tia</exclude>
     </testsuite>
   </testsuites>
   <source>

pint.json

@@ -0,0 +1,5 @@
+{
+    "exclude": [
+        "tests/Fixtures/Suites"
+    ]
+}

rector.php

@@ -28,6 +28,7 @@ return RectorConfig::configure()
     ->withSkip([
         __DIR__.'/src/Plugins/Parallel/Paratest/WrapperRunner.php',
         __DIR__.'/tests/Fixtures/Arch',
+        __DIR__.'/tests/Fixtures/Suites',
         ReturnNeverTypeRector::class,
         ArrowFunctionDelegatingCallToFirstClassCallableRector::class,
         NarrowObjectReturnTypeRector::class,

src/Bootstrappers/BootSubscribers.php

@@ -35,6 +35,12 @@ final readonly class BootSubscribers implements Bootstrapper
         Subscribers\EnsureTiaResultIsRecordedOnSkipped::class,
         Subscribers\EnsureTiaResultIsRecordedOnIncomplete::class,
         Subscribers\EnsureTiaResultIsRecordedOnRisky::class,
+        Subscribers\EnsureTiaResultIsRecordedOnNoticeTriggered::class,
+        Subscribers\EnsureTiaResultIsRecordedOnPhpNoticeTriggered::class,
+        Subscribers\EnsureTiaResultIsRecordedOnDeprecationTriggered::class,
+        Subscribers\EnsureTiaResultIsRecordedOnPhpDeprecationTriggered::class,
+        Subscribers\EnsureTiaResultIsRecordedOnWarningTriggered::class,
+        Subscribers\EnsureTiaResultIsRecordedOnPhpWarningTriggered::class,
         Subscribers\EnsureTiaAssertionsAreRecordedOnFinished::class,
     ];
 

src/Concerns/Testable.php

@@ -280,12 +280,14 @@ trait Testable
 
         /** @var Tia $tia */
         $tia = Container::getInstance()->get(Tia::class);
-        $status = $tia->getStatus(self::$__filename, $this::class.'::'.$this->name());
+        $status = $tia->getStatus(self::$__filename, $this->valueObjectForEvents()->id());
         $replay = ReplayType::fromStatus($status);
 
         if ($replay !== ReplayType::None) {
             assert($status !== null);
 
+            $this->__replay = $replay;
+
             match ($replay) {
                 ReplayType::Pass, ReplayType::Risky => $this->__beginReplay($replay, $tia),
                 ReplayType::Skipped => $this->markTestSkipped($status->message()),
@@ -319,7 +321,7 @@ trait Testable
     private function __beginReplay(ReplayType $replay, Tia $tia): void
     {
         $this->__replay = $replay;
-        $this->__replayAssertions = $tia->getAssertionCount($this::class.'::'.$this->name());
+        $this->__replayAssertions = $tia->getAssertionCount($this->valueObjectForEvents()->id());
         $this->__ran = true;
     }
 

src/Exceptions/AfterAllAlreadyExist.php

@@ -19,6 +19,6 @@ final class AfterAllAlreadyExist extends InvalidArgumentException implements Exc
      */
     public function __construct(string $filename)
     {
-        parent::__construct(sprintf('The afterAll already exists in the filename `%s`.', $filename));
+        parent::__construct(sprintf('The afterAll already exists in the filename [%s].', $filename));
     }
 }

src/Exceptions/AfterAllWithinDescribe.php

@@ -19,6 +19,6 @@ final class AfterAllWithinDescribe extends InvalidArgumentException implements E
      */
     public function __construct(string $filename)
     {
-        parent::__construct(sprintf('The afterAll method can not be used within describe functions. Filename `%s`.', $filename));
+        parent::__construct(sprintf('The afterAll method can not be used within describe functions. Filename [%s].', $filename));
     }
 }

src/Exceptions/AfterBeforeTestFunction.php

@@ -19,6 +19,6 @@ final class AfterBeforeTestFunction extends InvalidArgumentException implements
      */
     public function __construct(string $filename)
     {
-        parent::__construct('After method cannot be used with before the [test|it] functions in the filename `['.$filename.']`.');
+        parent::__construct('After method cannot be used with before the [test|it] functions in the filename ['.$filename.'].');
     }
 }

src/Exceptions/BeforeAllAlreadyExist.php

@@ -19,6 +19,6 @@ final class BeforeAllAlreadyExist extends InvalidArgumentException implements Ex
      */
     public function __construct(string $filename)
     {
-        parent::__construct(sprintf('The beforeAll already exists in the filename `%s`.', $filename));
+        parent::__construct(sprintf('The beforeAll already exists in the filename [%s].', $filename));
     }
 }

src/Exceptions/BeforeAllWithinDescribe.php

@@ -19,6 +19,6 @@ final class BeforeAllWithinDescribe extends InvalidArgumentException implements
      */
     public function __construct(string $filename)
     {
-        parent::__construct(sprintf('The beforeAll method can not be used within describe functions. Filename `%s`.', $filename));
+        parent::__construct(sprintf('The beforeAll method can not be used within describe functions. Filename [%s].', $filename));
     }
 }

src/Exceptions/DatasetAlreadyExists.php

@@ -19,6 +19,6 @@ final class DatasetAlreadyExists extends InvalidArgumentException implements Exc
      */
     public function __construct(string $name, string $scope)
     {
-        parent::__construct(sprintf('A dataset with the name `%s` already exists in scope [%s].', $name, $scope));
+        parent::__construct(sprintf('A dataset with the name [%s] already exists in scope [%s].', $name, $scope));
     }
 }

src/Exceptions/DatasetDoesNotExist.php

@@ -19,6 +19,6 @@ final class DatasetDoesNotExist extends InvalidArgumentException implements Exce
      */
     public function __construct(string $name)
     {
-        parent::__construct(sprintf("A dataset with the name `%s` does not exist. You can create it using `dataset('%s', ['a', 'b']);`.", $name, $name));
+        parent::__construct(sprintf("A dataset with the name [%s] does not exist. You can create it using `dataset('%s', ['a', 'b']);`.", $name, $name));
     }
 }

src/Exceptions/FileOrFolderNotFound.php

@@ -19,6 +19,6 @@ final class FileOrFolderNotFound extends InvalidArgumentException implements Exc
      */
     public function __construct(string $filename)
     {
-        parent::__construct(sprintf('The file or folder with the name `%s` could not be found.', $filename));
+        parent::__construct(sprintf('The file or folder with the name [%s] could not be found.', $filename));
     }
 }

src/Exceptions/InvalidTestClassName.php

@@ -0,0 +1,41 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Exceptions;
+
+use InvalidArgumentException;
+use NunoMaduro\Collision\Contracts\RenderlessEditor;
+use NunoMaduro\Collision\Contracts\RenderlessTrace;
+use Symfony\Component\Console\Exception\ExceptionInterface;
+
+/**
+ * @internal
+ */
+final class InvalidTestClassName extends InvalidArgumentException implements ExceptionInterface, RenderlessEditor, RenderlessTrace
+{
+    /**
+     * Creates a new Exception instance for the given class name.
+     */
+    public static function fromClassName(string $filename, string $className): self
+    {
+        return new self(sprintf(
+            'The test file [%s] would create the class [%s], which is not a valid PHP class name. Please rename the test file.',
+            $filename,
+            $className,
+        ));
+    }
+
+    /**
+     * Creates a new Exception instance for the given namespace.
+     */
+    public static function fromNamespace(string $filename, string $namespace, string $part): self
+    {
+        return new self(sprintf(
+            'The test file [%s] would create the namespace [%s], which is not a valid PHP namespace, as [%s] may not be used as a namespace name. Please rename the folder in question.',
+            $filename,
+            $namespace,
+            $part,
+        ));
+    }
+}

src/Exceptions/MissingDependency.php

@@ -19,6 +19,6 @@ final class MissingDependency extends InvalidArgumentException implements Except
      */
     public function __construct(string $feature, string $dependency)
     {
-        parent::__construct(sprintf('The feature "%s" requires "%s".', $feature, $dependency));
+        parent::__construct(sprintf('The feature [%s] requires [%s].', $feature, $dependency));
     }
 }

src/Exceptions/TestAlreadyExist.php

@@ -19,6 +19,6 @@ final class TestAlreadyExist extends InvalidArgumentException implements Excepti
      */
     public function __construct(string $fileName, string $description)
     {
-        parent::__construct(sprintf('A test with the description `%s` already exists in the filename `%s`.', $description, $fileName));
+        parent::__construct(sprintf('A test with the description [%s] already exists in the filename [%s].', $description, $fileName));
     }
 }

src/Exceptions/TestCaseClassOrTraitNotFound.php

@@ -19,6 +19,6 @@ final class TestCaseClassOrTraitNotFound extends InvalidArgumentException implem
      */
     public function __construct(string $testCaseClass)
     {
-        parent::__construct(sprintf('The class `%s` was not found.', $testCaseClass));
+        parent::__construct(sprintf('The class [%s] was not found.', $testCaseClass));
     }
 }

src/Exceptions/TestDescriptionMissing.php

@@ -19,6 +19,6 @@ final class TestDescriptionMissing extends InvalidArgumentException implements E
      */
     public function __construct(string $fileName)
     {
-        parent::__construct(sprintf('Test description is missing in the filename `%s`.', $fileName));
+        parent::__construct(sprintf('Test description is missing in the filename [%s].', $fileName));
     }
 }

src/Exceptions/TiaRequiresCommit.php

@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Exceptions;
+
+use NunoMaduro\Collision\Contracts\RenderlessEditor;
+use NunoMaduro\Collision\Contracts\RenderlessTrace;
+use Pest\Contracts\Panicable;
+use RuntimeException;
+use Symfony\Component\Console\Exception\ExceptionInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * @internal
+ */
+final class TiaRequiresCommit extends RuntimeException implements ExceptionInterface, Panicable, RenderlessEditor, RenderlessTrace
+{
+    public function __construct()
+    {
+        parent::__construct(
+            'Tia mode requires a repository with at least one commit, so the baseline it records can be anchored to a revision.',
+        );
+    }
+
+    public function render(OutputInterface $output): void
+    {
+        $output->writeln([
+            '',
+            '  <fg=white;options=bold;bg=red> ERROR </> Tia mode requires at least one commit.',
+            '',
+            '  A baseline is anchored to the revision it was recorded at, and this repository',
+            '  has none yet, so there is nothing to record against and nothing to compare a',
+            '  later run to.',
+            '',
+            '  Commit once, then run again:',
+            '',
+            '    <fg=yellow>git add . && git commit -m "Initial commit"</>',
+            '',
+            '  Runs without <fg=yellow>--tia</> are unaffected.',
+            '',
+        ]);
+    }
+
+    public function exitCode(): int
+    {
+        return 1;
+    }
+}

src/Exceptions/TiaRequiresDefaultBranch.php

@@ -0,0 +1,52 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Exceptions;
+
+use NunoMaduro\Collision\Contracts\RenderlessEditor;
+use NunoMaduro\Collision\Contracts\RenderlessTrace;
+use Pest\Contracts\Panicable;
+use RuntimeException;
+use Symfony\Component\Console\Exception\ExceptionInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * @internal
+ */
+final class TiaRequiresDefaultBranch extends RuntimeException implements ExceptionInterface, Panicable, RenderlessEditor, RenderlessTrace
+{
+    public function __construct()
+    {
+        parent::__construct(
+            'Tia mode could not determine the default branch every other branch falls back to reading.',
+        );
+    }
+
+    public function render(OutputInterface $output): void
+    {
+        $output->writeln([
+            '',
+            '  <fg=white;options=bold;bg=red> ERROR </> Tia mode could not determine the default branch.',
+            '',
+            '  It is the branch whose baseline every other branch falls back to reading, and',
+            '  nothing in this checkout names it: the repository has a remote, but no',
+            '  <fg=yellow>origin/HEAD</>, and no CI provider stated it either. Guessing would re-run the',
+            '  whole suite on every new branch while reporting it as a cache hit.',
+            '',
+            '  Name the branch in <fg=yellow>tests/Pest.php</>:',
+            '',
+            '    <fg=yellow>pest()->tia()->defaultBranch(\'master\');</>',
+            '',
+            '  Or let git answer, once per clone:',
+            '',
+            '    <fg=yellow>git remote set-head origin --auto</>',
+            '',
+        ]);
+    }
+
+    public function exitCode(): int
+    {
+        return 1;
+    }
+}

src/Exceptions/TiaRequiresRemote.php

@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Exceptions;
+
+use NunoMaduro\Collision\Contracts\RenderlessEditor;
+use NunoMaduro\Collision\Contracts\RenderlessTrace;
+use Pest\Contracts\Panicable;
+use RuntimeException;
+use Symfony\Component\Console\Exception\ExceptionInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * @internal
+ */
+final class TiaRequiresRemote extends RuntimeException implements ExceptionInterface, Panicable, RenderlessEditor, RenderlessTrace
+{
+    public function __construct()
+    {
+        parent::__construct(
+            'Tia mode requires a repository with a remote, so the default branch every other branch falls back to reading can be resolved.',
+        );
+    }
+
+    public function render(OutputInterface $output): void
+    {
+        $output->writeln([
+            '',
+            '  <fg=white;options=bold;bg=red> ERROR </> Tia mode requires a repository with a remote.',
+            '',
+            '  Without one there is no way to tell which branch is the default — the branch',
+            '  whose baseline every other branch falls back to reading — so the first run on',
+            '  each new branch would silently re-run the whole suite.',
+            '',
+            '  Add a remote, or name the branch yourself in <fg=yellow>tests/Pest.php</>:',
+            '',
+            '    <fg=yellow>pest()->tia()->defaultBranch(\'master\');</>',
+            '',
+        ]);
+    }
+
+    public function exitCode(): int
+    {
+        return 1;
+    }
+}

src/Factories/TestCaseFactory.php

@@ -9,6 +9,7 @@ use Pest\Concerns;
 use Pest\Contracts\HasPrintableTestCaseName;
 use Pest\Evaluators\Attributes;
 use Pest\Exceptions\DatasetMissing;
+use Pest\Exceptions\InvalidTestClassName;
 use Pest\Exceptions\ShouldNotHappen;
 use Pest\Exceptions\TestAlreadyExist;
 use Pest\Exceptions\TestClosureMustNotBeStatic;
@@ -138,6 +139,16 @@ final class TestCaseFactory
 
         if (trim($className) === '') {
             $className = 'InvalidTestName'.Str::random();
+        } elseif (! Str::isValidClassName($className)) {
+            throw InvalidTestClassName::fromClassName($this->filename, $className);
+        }
+
+        if ($this->namespace === null) {
+            foreach ($partsFQN as $partFQN) {
+                if (! Str::isValidIdentifier($partFQN)) {
+                    throw InvalidTestClassName::fromNamespace($this->filename, $namespace, $partFQN);
+                }
+            }
         }
 
         $this->attributes = [

src/Pest.php

@@ -6,7 +6,7 @@ namespace Pest;
 
 function version(): string
 {
-    return '5.0.2';
+    return '5.0.4';
 }
 
 function testDirectory(string $file = ''): string

src/Plugins/Parallel/Paratest/WrapperRunner.php

@@ -14,6 +14,7 @@ use ParaTest\RunnerInterface;
 use ParaTest\WrapperRunner\MissingResultsException;
 use ParaTest\WrapperRunner\SuiteLoader;
 use ParaTest\WrapperRunner\WrapperWorker;
+use Pest\Plugins\Tia;
 use Pest\Result;
 use Pest\TestSuite;
 use PHPUnit\Event\Facade as EventFacade;
@@ -155,6 +156,7 @@ final class WrapperRunner implements RunnerInterface
 
         /** @var array<int, non-empty-string> $parameters */
         $parameters = $this->handleLaravelHerd($parameters);
+        $parameters = $this->handleTia($parameters);
 
         $parameters[] = $wrapper;
         $parameters[] = '--test-directory='.TestSuite::getInstance()->testPath;
@@ -202,6 +204,19 @@ final class WrapperRunner implements RunnerInterface
         return $parameters;
     }
 
+    /**
+     * @param  array<int, non-empty-string>  $parameters
+     * @return array<int, non-empty-string>
+     */
+    private function handleTia(array $parameters): array
+    {
+        if (! Tia::recordsEdgesInWorkers()) {
+            return $parameters;
+        }
+
+        return array_merge($parameters, ['-d', 'pcov.directory='.TestSuite::getInstance()->rootPath]);
+    }
+
     private function startWorkers(): void
     {
         for ($token = 1; $token <= $this->options->processes; $token++) {

src/Plugins/Tia.php

@@ -7,13 +7,20 @@ namespace Pest\Plugins;
 use NunoMaduro\Collision\Adapters\Phpunit\Printers\DefaultPrinter;
 use Pest\Contracts\Plugins\AddsOutput;
 use Pest\Contracts\Plugins\HandlesArguments;
+use Pest\Contracts\Plugins\HandlesOriginalArguments;
 use Pest\Contracts\Plugins\Terminable;
+use Pest\Exceptions\InvalidOption;
+use Pest\Exceptions\MissingDependency;
 use Pest\Exceptions\NoAffectedTestsFound;
+use Pest\Exceptions\TiaRequiresCommit;
+use Pest\Exceptions\TiaRequiresDefaultBranch;
+use Pest\Exceptions\TiaRequiresRemote;
 use Pest\Exceptions\TiaRequiresRepositoryRoot;
 use Pest\Panic;
 use Pest\Plugins\Concerns\HandleArguments;
 use Pest\Plugins\Tia\BaselineSync;
 use Pest\Plugins\Tia\ChangedFiles;
+use Pest\Plugins\Tia\CiDefaultBranch;
 use Pest\Plugins\Tia\Contracts\State;
 use Pest\Plugins\Tia\CoverageCollector;
 use Pest\Plugins\Tia\Fingerprint;
@@ -26,17 +33,18 @@ use Pest\Plugins\Tia\Storage;
 use Pest\Plugins\Tia\TableExtractor;
 use Pest\Plugins\Tia\WatchPatterns;
 use Pest\Support\Container;
+use Pest\Support\Git;
 use Pest\Support\View;
 use Pest\TestCaseFilters\TiaTestCaseFilter;
 use Pest\TestSuite;
 use PHPUnit\Framework\TestStatus\TestStatus;
+use PHPUnit\TestRunner\TestResult\Facade as TestResultFacade;
 use Symfony\Component\Console\Output\OutputInterface;
-use Symfony\Component\Process\Process;
 
 /**
  * @internal
  */
-final class Tia implements AddsOutput, HandlesArguments, Terminable
+final class Tia implements AddsOutput, HandlesArguments, HandlesOriginalArguments, Terminable
 {
     use HandleArguments;
 
@@ -56,6 +64,8 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
 
     private const string BASELINE_PATH_OPTION = '--baseline';
 
+    private const string ENV_MUTATION_TESTING = 'PEST_MUTATION_TESTING';
+
     private const string ENV_TIA = 'PEST_TIA';
 
     private const string ENV_FILTERED = 'PEST_TIA_FILTERED';
@@ -86,8 +96,14 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
 
     private const string FILTERED_GLOBAL = 'TIA_FILTERED';
 
+    private const string WORKER_RESULTS_GLOBAL = 'TIA_WORKER_RESULTS';
+
     private const string PIGGYBACK_COVERAGE_GLOBAL = 'TIA_PIGGYBACK_COVERAGE';
 
+    private const string FALLBACK_BRANCH_GLOBAL = 'TIA_FALLBACK_BRANCH';
+
+    private const string DEFAULT_BRANCH = 'main';
+
     /**
      * PHPUnit/Pest CLI flags whose subsequent argument is a value, not a path.
      *
@@ -101,12 +117,32 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
         '--include-path', '--whitelist',
         '--log-junit', '--log-teamcity', '--testdox-html', '--testdox-text',
         '--coverage-clover', '--coverage-cobertura', '--coverage-crap4j',
-        '--coverage-html', '--coverage-php', '--coverage-text', '--coverage-xml',
+        '--coverage-html', '--coverage-openclover', '--coverage-php',
+        '--coverage-text', '--coverage-xml',
         '--coverage-filter', '--path-coverage',
         '--repeat', '--retry-times', '--memory-limit', '--seed',
         '--compact', '--ci-build-id', '--min',
     ];
 
+    /** @var list<string> */
+    private const array COVERAGE_REPORT_FLAGS = [
+        '--coverage-clover', '--coverage-cobertura', '--coverage-crap4j',
+        '--coverage-html', '--coverage-openclover', '--coverage-php',
+        '--coverage-text', '--coverage-xml',
+    ];
+
+    /** @var list<string> */
+    private const array PARTIAL_SELECTION_FLAGS = [
+        '--filter', '--exclude-filter', '--group', '--exclude-group',
+        '--covers', '--uses', '--testsuite', '--exclude-testsuite', '--test-suffix',
+        '--dirty', '--todo', '--todos', '--flaky', '--notes',
+        '--assignee', '--issue', '--ticket', '--pr', '--pull-request',
+    ];
+
+    private const array UNSUPPORTED_OPTIONS = [
+        '--covers', '--uses', '--random-order-seed',
+    ];
+
     private bool $graphWritten = false;
 
     private bool $replayRan = false;
@@ -120,9 +156,21 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
     /** @var array<string, int> */
     private array $cachedAssertionsByTestId = [];
 
+    /** @var array<string, array{status: int, message: string}> */
+    private array $cachedStatusByTestId = [];
+
+    /** @var array<string, float> */
+    private array $cachedTimeByTestId = [];
+
     private ?Graph $replayGraph = null;
 
-    private string $branch = 'main';
+    private string $branch = self::DEFAULT_BRANCH;
+
+    private string $fallbackBranch = self::DEFAULT_BRANCH;
+
+    private bool $fallbackBranchResolved = false;
+
+    private bool $branchResolved = false;
 
     /** @var array<string, true> */
     private array $affectedFiles = [];
@@ -138,10 +186,23 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
 
     private bool $baselineFetchAttemptedForDrift = false;
 
-    private bool $freshRebuild = false;
-
     private bool $filteredMode = false;
 
+    private bool $writesSuppressed = false;
+
+    private bool $resultsOnlyWrites = false;
+
+    private bool $flushesWorkerResults = false;
+
+    private bool $unreadableGraphReported = false;
+
+    private bool $detachedHead = false;
+
+    private bool $graphUnreachable = false;
+
+    /** @var array<int, string> */
+    private array $originalArguments = [];
+
     private ?string $driftLabel = null;
 
     private ?string $driftDetails = null;
@@ -185,11 +246,54 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
             return null;
         }
 
-        return Graph::decode($json, $projectRoot);
+        $graph = Graph::decode($json, $projectRoot);
+
+        if (! $graph instanceof Graph) {
+            $this->discardUnreadableGraph();
+
+            return null;
+        }
+
+        $graph->setFallbackBranch($this->fallbackBranch);
+
+        return $graph;
+    }
+
+    private function discardUnreadableGraph(): void
+    {
+        if (Parallel::isWorker()) {
+            return;
+        }
+
+        if (! $this->deleteState(self::KEY_GRAPH)) {
+            return;
+        }
+
+        if ($this->unreadableGraphReported) {
+            return;
+        }
+
+        $this->unreadableGraphReported = true;
+
+        $this->output->writeln('');
+        $this->renderBadge('WARN', 'The dependency graph could not be read — it will be rebuilt.');
+    }
+
+    private function deleteState(string $key): bool
+    {
+        if ($this->detachedHead) {
+            return false;
+        }
+
+        return $this->state->delete($key);
     }
 
     private function saveGraph(Graph $graph): bool
     {
+        if ($this->detachedHead) {
+            return true;
+        }
+
         $json = $graph->encode();
 
         if ($json === null) {
@@ -227,6 +331,12 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
         return ! self::argumentPresent('--ci', $arguments);
     }
 
+    public static function recordsEdgesInWorkers(): bool
+    {
+        return (string) Parallel::getGlobal(self::RECORDING_GLOBAL) === '1'
+            && (string) Parallel::getGlobal(self::PIGGYBACK_COVERAGE_GLOBAL) !== '1';
+    }
+
     /**
      * @param  array<int, string>  $arguments
      */
@@ -303,8 +413,18 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
             }
 
             $this->replayedCount++;
+            $this->cachedStatusByTestId[$testId] = [
+                'status' => $result->asInt(),
+                'message' => $result->message(),
+            ];
             $assertions = $this->replayGraph->getAssertions($this->branch, $testId);
             $this->cachedAssertionsByTestId[$testId] = $assertions ?? 0;
+
+            $time = $this->replayGraph->getTime($this->branch, $testId);
+
+            if ($time !== null) {
+                $this->cachedTimeByTestId[$testId] = $time;
+            }
         } else {
             $this->executedCount++;
         }
@@ -317,6 +437,14 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
         return $this->cachedAssertionsByTestId[$testId] ?? 0;
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    public function handleOriginalArguments(array $arguments): void
+    {
+        $this->originalArguments = $arguments;
+    }
+
     /**
      * {@inheritDoc}
      */
@@ -339,9 +467,20 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
         $cliEnabled = $this->hasArgument(self::OPTION, $arguments) || self::envFlagEnabled(self::ENV_TIA);
         $alwaysEnabled = $watchPatterns->isEnabled()
             && (! $watchPatterns->isLocally() || Environment::name() === Environment::LOCAL);
+        if (! $isWorker && ! $disabled && ($cliEnabled || $alwaysEnabled)) {
+            $this->guardUnsupportedOptions($arguments);
+        }
+
+        $hasExplicitPath = $this->hasExplicitPathArgument($arguments);
+        $partial = ! $isWorker && ($hasExplicitPath || $this->hasPartialSelection($arguments));
+        $disabled = $disabled || $partial;
+
+        if (getenv(self::ENV_MUTATION_TESTING) !== false) {
+            $this->writesSuppressed = true;
+        }
         $enabled = ! $disabled && ($cliEnabled || $alwaysEnabled);
         $this->filteredMode = ($this->hasArgument(self::FILTERED_OPTION, $arguments) || self::envFlagEnabled(self::ENV_FILTERED) || $watchPatterns->isFiltered())
-            && ! $this->hasExplicitPathArgument($arguments)
+            && ! $hasExplicitPath
             && ! $this->coverageReportActive();
         $freshRequested = $this->hasArgument(self::FRESH_OPTION, $arguments);
         $this->forceRefetch = $this->hasArgument(self::REFETCH_OPTION, $arguments);
@@ -355,17 +494,35 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
         $arguments = $this->popArgument(self::BASELINED_OPTION, $arguments);
 
         if ($disabled) {
+            $this->requestWorkerResults();
+
+            if ($partial) {
+                $this->resultsOnlyWrites = true;
+
+                if ($cliEnabled || $freshRequested || $this->forceRefetch || $this->filteredMode) {
+                    $this->output->writeln('');
+                    $this->renderChild('TIA does not apply to partial runs — running the selected tests directly.');
+                }
+            }
+
             $this->forceRefetch = false;
             $this->filteredMode = false;
-            $this->freshRebuild = false;
+
+            return $arguments;
+        }
+
+        if ($isWorker && (string) Parallel::getGlobal(self::WORKER_RESULTS_GLOBAL) === '1') {
+            $this->flushesWorkerResults = true;
+            $this->resultsOnlyWrites = true;
 
             return $arguments;
         }
 
         $forceRebuild = $freshRequested && ($enabled || $recordingGlobal || $replayingGlobal);
-        $this->freshRebuild = $forceRebuild;
 
         if (! $enabled && ! $this->forceRefetch && ! $recordingGlobal && ! $replayingGlobal) {
+            $this->requestWorkerResults();
+
             return $arguments;
         }
 
@@ -388,10 +545,17 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
             return;
         }
 
-        if (Parallel::isWorker() && ($this->replayGraph instanceof Graph || $this->recordingActive)) {
+        if (Parallel::isWorker() && ($this->replayGraph instanceof Graph || $this->recordingActive || $this->flushesWorkerResults)) {
             $this->flushWorkerReplay();
         }
 
+        if ($this->writesSuppressed || $this->resultsOnlyWrites || $this->hasUnfinishedTest()) {
+            $this->recorder->reset();
+            $this->coverageCollector->reset();
+
+            return;
+        }
+
         $recorder = $this->recorder;
 
         if (! $this->recordingActive && ! $recorder->isActive()) {
@@ -453,15 +617,11 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
             $this->branch,
             $changedFiles->snapshotTree($changedFiles->since($currentSha) ?? []),
         );
-        $graph->replaceEdges($perTest);
+        $graph->replaceEdges($perTest, keepExisting: $this->piggybackCoverage);
         $graph->replaceTestTables($perTestTables);
         $graph->replaceTestInertiaComponents($perTestInertia);
         $graph->replaceJsFileToComponents(JsModuleGraph::build($projectRoot));
 
-        if ($this->freshRebuild) {
-            $graph->pruneMissingTests();
-        }
-
         $this->seedResultsInto($graph);
 
         if (! $this->saveGraph($graph)) {
@@ -481,13 +641,27 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
             return $exitCode;
         }
 
+        if (Only::isEnabled() || $this->stoppedEarly() || $this->hasUnfinishedTest()) {
+            $this->resultsOnlyWrites = true;
+        }
+
         $this->reportMissingWorkerDrivers();
 
         if (Parallel::isEnabled()) {
             $this->mergeWorkerReplayPartials();
         }
 
-        if ($this->replayRan) {
+        if ($this->writesSuppressed) {
+            return $exitCode;
+        }
+
+        if ($this->resultsOnlyWrites) {
+            $this->snapshotTestResults(complete: false);
+
+            return $exitCode;
+        }
+
+        if ($this->replayRan || $this->graphUnreachable) {
             $this->bumpRecordedSha();
         }
 
@@ -547,15 +721,11 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
             return $exitCode;
         }
 
-        $graph->replaceEdges($finalised);
+        $graph->replaceEdges($finalised, keepExisting: $this->piggybackCoverage);
         $graph->replaceTestTables($finalisedTables);
         $graph->replaceTestInertiaComponents($finalisedInertia);
         $graph->replaceJsFileToComponents(JsModuleGraph::build($projectRoot));
 
-        if ($this->freshRebuild) {
-            $graph->pruneMissingTests();
-        }
-
         if (! $this->saveGraph($graph)) {
             $this->renderBadge('ERROR', 'Could not write the dependency graph.');
 
@@ -598,8 +768,8 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
                 return $this->reconcileFingerprint($rebuilt, $current);
             }
 
-            $this->state->delete(self::KEY_GRAPH);
+            $this->deleteState(self::KEY_GRAPH);
-            $this->state->delete(self::KEY_COVERAGE_CACHE);
+            $this->deleteState(self::KEY_COVERAGE_CACHE);
 
             return null;
         }
@@ -615,7 +785,7 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
             $graph->clearResults($this->branch);
             $graph->setFingerprint($current);
             $this->saveGraph($graph);
-            $this->state->delete(self::KEY_COVERAGE_CACHE);
+            $this->deleteState(self::KEY_COVERAGE_CACHE);
         }
 
         return $graph;
@@ -635,12 +805,28 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
             Panic::with(new TiaRequiresRepositoryRoot($subdirectoryPrefix));
         }
 
-        $this->branch = new ChangedFiles($projectRoot)->currentBranch() ?? 'main';
+        try {
+            $this->resolveBranch($projectRoot);
+        } catch (MissingDependency $missingGit) {
+            $repository = new ChangedFiles($projectRoot);
+
+            if ($repository->isRepository() && ! $repository->hasCommits()) {
+                Panic::with(new TiaRequiresCommit);
+            }
+
+            throw $missingGit;
+        }
+
+        if (! $this->fallbackBranchResolved) {
+            Panic::with(new ChangedFiles($projectRoot)->hasRemote()
+                ? new TiaRequiresDefaultBranch
+                : new TiaRequiresRemote);
+        }
 
         $fingerprint = Fingerprint::compute($projectRoot);
         $this->startFingerprint = $fingerprint;
 
-        if ($forceRebuild) {
+        if ($forceRebuild && ! $this->detachedHead) {
             Storage::purge($projectRoot);
         }
 
@@ -658,6 +844,7 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
                 && $changedFiles->since($branchSha) === null) {
                 $this->renderBadge('WARN', 'Recorded commit is no longer reachable — graph will be rebuilt.');
                 $graph = null;
+                $this->graphUnreachable = true;
             }
         }
 
@@ -673,13 +860,21 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
             }
         }
 
-        if ($this->piggybackCoverage) {
+        $coverageCacheOwned = $this->piggybackCoverage && $this->pestCoverageActive();
+
+        if ($coverageCacheOwned) {
             $this->state->write(self::KEY_COVERAGE_MARKER, '');
         }
 
-        if ($this->piggybackCoverage && ! $this->state->exists(self::KEY_COVERAGE_CACHE)) {
+        if (! $graph instanceof Graph && $this->piggybackCoverage) {
-            if ($graph instanceof Graph && $this->driftLabel === null) {
+            $this->emitCoverageScopedRecordSkipped();
-                $this->freshGraphReason = 'recording coverage baseline';
+
+            return $arguments;
+        }
+
+        if ($coverageCacheOwned && ! $this->state->exists(self::KEY_COVERAGE_CACHE)) {
+            if ($this->driftLabel === null) {
+                $this->freshGraphReason = 'recording a coverage baseline';
             }
 
             return $this->enterRecordMode($arguments);
@@ -698,7 +893,7 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
      */
     private function handleWorker(array $arguments, string $projectRoot, bool $recordingGlobal, bool $replayingGlobal): array
     {
-        $this->branch = new ChangedFiles($projectRoot)->currentBranch() ?? 'main';
+        $this->resolveBranch($projectRoot);
 
         if ($replayingGlobal) {
             $this->installWorkerReplay($projectRoot);
@@ -833,7 +1028,7 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
             return $arguments;
         }
 
-        $affectedFromChanges = $changed === [] ? [] : $graph->affected($changed);
+        $affectedFromChanges = $changed === [] ? [] : $graph->testFilesOnDisk($graph->affected($changed));
         $rerunFromCache = [];
 
         if ($this->filteredMode && $graph->hasUnlocatedTestsToRerun($this->branch)) {
@@ -875,7 +1070,12 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
 
         if (! Parallel::isEnabled()) {
             if ($canRefreshReplayEdges) {
+                if ($this->piggybackCoverage) {
+                    $this->recorder->activateLinkTracking();
+                } else {
                     $this->recorder->activate();
+                }
+
                 $this->recordingActive = true;
             }
 
@@ -894,6 +1094,10 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
 
         if ($canRefreshReplayEdges) {
             Parallel::setGlobal(self::RECORDING_GLOBAL, '1');
+
+            if ($this->piggybackCoverage) {
+                Parallel::setGlobal(self::PIGGYBACK_COVERAGE_GLOBAL, '1');
+            }
         }
 
         if ($this->filteredMode) {
@@ -1035,6 +1239,13 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
         $recorder->activate();
         $this->recordingActive = true;
 
+        if ($this->driftLabel !== null || $this->freshGraphReason !== null) {
+            $this->output->writeln('');
+            $this->renderFreshGraph();
+
+            return $arguments;
+        }
+
         $this->renderChild('Running in TIA mode.');
 
         return $arguments;
@@ -1042,15 +1253,17 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
 
     private function renderFreshGraph(): void
     {
+        if ($this->driftLabel === null && $this->freshGraphReason !== null) {
+            $headline = sprintf('Experimental TIA mode enabled / %s.', $this->freshGraphReason);
+        } else {
             $headline = 'Experimental TIA mode enabled / fresh graph';
 
             if ($this->driftLabel !== null) {
                 $headline .= sprintf(' (%s changed)', $this->driftLabel);
-        } elseif ($this->freshGraphReason !== null) {
-            $headline .= sprintf(' (%s)', $this->freshGraphReason);
             } else {
                 $headline .= '.';
             }
+        }
 
         $this->renderChild($headline);
 
@@ -1065,7 +1278,15 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
     {
         $this->output->writeln('');
 
-        $this->renderChild('Running in TIA mode, however TIA as skipped as it needs Needs ext-pcov or Xdebug.');
+        $this->renderChild('Running in TIA mode, however TIA is skipped as it needs ext-pcov or Xdebug.');
+    }
+
+    private function emitCoverageScopedRecordSkipped(): void
+    {
+        $this->output->writeln('');
+
+        $this->renderChild('Running in TIA mode, however TIA is skipped as an active coverage report narrows the edges it could record.');
+        $this->renderChild('Record the baseline with a plain --tia run first; coverage runs then reuse it.');
     }
 
     /**
@@ -1115,6 +1336,21 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
         $this->renderChild('Install / enable pcov or xdebug (mode: coverage) in the worker PHP and rerun.');
     }
 
+    private function requestWorkerResults(): void
+    {
+        if (Parallel::isWorker() || ! Parallel::isEnabled() || $this->writesSuppressed) {
+            return;
+        }
+
+        if ($this->state->read(self::KEY_GRAPH) === null) {
+            return;
+        }
+
+        $this->purgeWorkerPartials();
+
+        Parallel::setGlobal(self::WORKER_RESULTS_GLOBAL, '1');
+    }
+
     private function purgeWorkerPartials(): void
     {
         foreach ($this->collectWorkerEdgesPartials() as $key) {
@@ -1136,11 +1372,16 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
             return;
         }
 
+        foreach ($results as $testId => $result) {
+            $results[$testId] = $this->replayedAsRecorded($testId, $result);
+        }
+
         $json = json_encode([
             'results' => $results,
             'replayed' => $this->replayedCount,
             'affected' => $this->affectedCount,
             'executed' => $this->executedCount,
+            'truncated' => $this->stoppedEarly() || $collector->hasUnfinishedTest(),
         ], JSON_UNESCAPED_SLASHES);
 
         if ($json === false) {
@@ -1177,6 +1418,10 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
                 continue;
             }
 
+            if (($decoded['truncated'] ?? false) === true) {
+                $this->resultsOnlyWrites = true;
+            }
+
             if (isset($decoded['replayed']) && is_int($decoded['replayed'])) {
                 $this->replayedCount += $decoded['replayed'];
             }
@@ -1400,6 +1645,29 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
         return $coverage;
     }
 
+    private function resultTime(string $testId, float $time): float
+    {
+        return $this->cachedTimeByTestId[$testId] ?? $time;
+    }
+
+    /**
+     * @param  array{status: int, message: string, time: float, assertions: int, file?: string}  $result
+     * @return array{status: int, message: string, time: float, assertions: int, file?: string}
+     */
+    private function replayedAsRecorded(string $testId, array $result): array
+    {
+        $result['time'] = $this->resultTime($testId, $result['time']);
+
+        $cached = $this->cachedStatusByTestId[$testId] ?? null;
+
+        if ($cached !== null) {
+            $result['status'] = $cached['status'];
+            $result['message'] = $cached['message'];
+        }
+
+        return $result;
+    }
+
     private function seedResultsInto(Graph $graph): void
     {
         /** @var ResultCollector $collector */
@@ -1419,6 +1687,8 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
                 $touchedFiles[$file] = true;
             }
 
+            $result = $this->replayedAsRecorded($testId, $result);
+
             $graph->setResult(
                 $this->branch,
                 $testId,
@@ -1432,11 +1702,34 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
 
         $graph->markKnownTestFiles(array_keys($touchedFiles));
         $graph->pruneStaleResults($this->branch, array_keys($touchedFiles), array_keys($results));
+        $this->reclaim($graph);
 
         $collector->reset();
     }
 
-    private function snapshotTestResults(bool $markKnownTestFiles = false): void
+    private function reclaim(Graph $graph): void
+    {
+        if ($this->branch !== $this->fallbackBranch) {
+            $graph->markBaselineComplete($this->branch);
+        }
+
+        $graph->pruneMissingTests();
+        $graph->pruneResultsForMissingFiles($this->branch);
+
+        $branches = new ChangedFiles(TestSuite::getInstance()->rootPath)->branchNames();
+
+        if ($branches === null) {
+            return;
+        }
+
+        if (! in_array($this->fallbackBranch, $branches, true)) {
+            return;
+        }
+
+        $graph->pruneMissingBranches([...$branches, $this->branch, $this->fallbackBranch]);
+    }
+
+    private function snapshotTestResults(bool $markKnownTestFiles = false, bool $complete = true): void
     {
         /** @var ResultCollector $collector */
         $collector = Container::getInstance()->get(ResultCollector::class);
@@ -1455,8 +1748,17 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
             return;
         }
 
+        try {
+            $this->resolveBranch($projectRoot);
+        } catch (MissingDependency) {
+        }
+
+        $graph->setFallbackBranch($this->fallbackBranch);
+
         $touchedFiles = [];
 
+        $recordsEdges = $complete && ($markKnownTestFiles || $this->recordingActive);
+
         foreach ($results as $testId => $result) {
             $file = $result['file'] ?? null;
 
@@ -1468,6 +1770,12 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
                 $touchedFiles[$file] = true;
             }
 
+            if (! $recordsEdges && (! is_string($file) || ! $graph->knowsTest($file))) {
+                continue;
+            }
+
+            $result = $this->replayedAsRecorded($testId, $result);
+
             $graph->setResult(
                 $this->branch,
                 $testId,
@@ -1483,7 +1791,10 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
             $graph->markKnownTestFiles(array_keys($touchedFiles));
         }
 
+        if ($complete) {
             $graph->pruneStaleResults($this->branch, array_keys($touchedFiles), array_keys($results));
+            $this->reclaim($graph);
+        }
 
         $this->saveGraph($graph);
         $collector->reset();
@@ -1521,6 +1832,15 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
     }
 
     private function coverageReportActive(): bool
+    {
+        if ($this->pestCoverageActive()) {
+            return true;
+        }
+
+        return array_any(self::COVERAGE_REPORT_FLAGS, fn (string $flag): bool => $this->hasArgument($flag, $this->originalArguments));
+    }
+
+    private function pestCoverageActive(): bool
     {
         $coverage = Container::getInstance()->get(Coverage::class);
         assert($coverage instanceof Coverage);
@@ -1528,6 +1848,105 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
         return $coverage->coverage;
     }
 
+    /**
+     * @param  array<int, string>  $arguments
+     */
+    private function guardUnsupportedOptions(array $arguments): void
+    {
+        foreach (self::UNSUPPORTED_OPTIONS as $option) {
+            if (! $this->hasArgument($option, $arguments) && ! $this->hasArgument($option, $this->originalArguments)) {
+                continue;
+            }
+
+            Panic::with(new InvalidOption(sprintf(
+                'The [%s] option cannot be combined with [%s].',
+                $option,
+                self::OPTION,
+            )));
+        }
+    }
+
+    /**
+     * @param  array<int, string>  $arguments
+     */
+    private function hasPartialSelection(array $arguments): bool
+    {
+        foreach (self::PARTIAL_SELECTION_FLAGS as $flag) {
+            if ($this->hasArgument($flag, $arguments)) {
+                return true;
+            }
+
+            if ($this->hasArgument($flag, $this->originalArguments)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    private function stoppedEarly(): bool
+    {
+        return TestResultFacade::shouldStop();
+    }
+
+    private function hasUnfinishedTest(): bool
+    {
+        $collector = Container::getInstance()->get(ResultCollector::class);
+        assert($collector instanceof ResultCollector);
+
+        return $collector->hasUnfinishedTest();
+    }
+
+    private function resolveBranch(string $projectRoot): void
+    {
+        if ($this->branchResolved) {
+            return;
+        }
+
+        $this->branchResolved = true;
+
+        $changedFiles = new ChangedFiles($projectRoot);
+
+        $resolved = $this->resolveFallbackBranch($changedFiles);
+
+        $this->fallbackBranchResolved = $resolved !== null;
+        $this->fallbackBranch = $resolved ?? self::DEFAULT_BRANCH;
+
+        Parallel::setGlobal(self::FALLBACK_BRANCH_GLOBAL, $this->fallbackBranch);
+
+        $currentBranch = $changedFiles->currentBranch();
+
+        $this->detachedHead = $currentBranch === null;
+        $this->branch = $currentBranch ?? $this->fallbackBranch;
+    }
+
+    private function resolveFallbackBranch(ChangedFiles $changedFiles): ?string
+    {
+        $inherited = Parallel::getGlobal(self::FALLBACK_BRANCH_GLOBAL);
+
+        if (is_string($inherited) && $inherited !== '') {
+            return $inherited;
+        }
+
+        return $this->watchPatterns->defaultBranch()
+            ?? CiDefaultBranch::detect()
+            ?? $changedFiles->defaultBranch()
+            ?? $this->soleRecordedBranch();
+    }
+
+    private function soleRecordedBranch(): ?string
+    {
+        $json = $this->state->read(self::KEY_GRAPH);
+
+        if ($json === null) {
+            return null;
+        }
+
+        $branches = Graph::branchesIn($json);
+
+        return count($branches) === 1 ? $branches[0] : null;
+    }
+
     /**
      * @param  array<int, string>  $arguments
      */
@@ -1549,11 +1968,15 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
             if (str_starts_with($arg, '-')) {
                 continue;
             }
-            if ($index > 0) {
+
-                $previous = $arguments[$index - 1] ?? '';
+            if ($index === 0) {
-                if (in_array($previous, self::VALUE_TAKING_FLAGS, true)) {
                 continue;
             }
+
+            $previous = $arguments[$index - 1] ?? '';
+
+            if (in_array($previous, self::VALUE_TAKING_FLAGS, true)) {
+                continue;
             }
 
             $candidate = $this->resolveArgumentPath($arg, $projectRoot);
@@ -1562,14 +1985,26 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
                 continue;
             }
 
+            if ($this->narrowsSuite($candidate, $testPaths)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * @param  array<int, string>  $testPaths
+     */
+    private function narrowsSuite(string $candidate, array $testPaths): bool
+    {
         foreach ($testPaths as $testPath) {
             if ($candidate === $testPath || str_starts_with($candidate, $testPath.DIRECTORY_SEPARATOR)) {
                 return true;
             }
         }
-        }
 
-        return false;
+        return array_all($testPaths, fn (string $testPath): bool => ! str_starts_with($testPath, $candidate.DIRECTORY_SEPARATOR));
     }
 
     private function resolveArgumentPath(string $arg, string $projectRoot): ?string
@@ -1701,16 +2136,7 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
      */
     private function gitSubdirectoryPrefix(string $projectRoot): ?string
     {
-        $process = new Process(['git', 'rev-parse', '--show-prefix'], $projectRoot);
+        return new Git($projectRoot)->subdirectoryPrefix();
-        $process->run();
-
-        if (! $process->isSuccessful()) {
-            return null;
-        }
-
-        $prefix = trim($process->getOutput());
-
-        return $prefix === '' ? null : rtrim(str_replace(DIRECTORY_SEPARATOR, '/', $prefix), '/');
     }
 
     private function composerLockDelta(string $projectRoot, string $sha): string
@@ -1720,15 +2146,13 @@ final class Tia implements AddsOutput, HandlesArguments, Terminable
             return '';
         }
 
-        $process = new Process(['git', 'show', $sha.':composer.lock'], $projectRoot);
+        $baseline = new Git($projectRoot)->show($sha, 'composer.lock');
-        $process->setTimeout(5.0);
-        $process->run();
 
-        if (! $process->isSuccessful()) {
+        if ($baseline === null) {
             return '';
         }
 
-        $oldVersions = $this->lockVersions($process->getOutput());
+        $oldVersions = $this->lockVersions($baseline);
         $newVersions = $this->lockVersions($current);
 
         if ($oldVersions === [] && $newVersions === []) {

src/Plugins/Tia/ChangedFiles.php

@@ -5,14 +5,19 @@ declare(strict_types=1);
 namespace Pest\Plugins\Tia;
 
 use Pest\Exceptions\MissingDependency;
-use Symfony\Component\Process\Process;
+use Pest\Support\Git;
 
 /**
  * @internal
  */
 final readonly class ChangedFiles
 {
-    public function __construct(private string $projectRoot) {}
+    private Git $git;
+
+    public function __construct(private string $projectRoot)
+    {
+        $this->git = new Git($projectRoot);
+    }
 
     /**
      * @param  array<int, string>  $files  project-relative paths.
@@ -155,15 +160,7 @@ final readonly class ChangedFiles
 
     private function contentAtSha(string $sha, string $path): ?string
     {
-        $process = new Process(['git', 'show', $sha.':'.$path], $this->projectRoot);
+        return $this->git->show($sha, $path);
-        $process->setTimeout(5.0);
-        $process->run();
-
-        if (! $process->isSuccessful()) {
-            return null;
-        }
-
-        return $process->getOutput();
     }
 
     /**
@@ -176,21 +173,17 @@ final readonly class ChangedFiles
             return $candidates;
         }
 
-        $process = new Process(
+        $result = $this->git->result(
-            ['git', 'check-ignore', '--no-index', '-z', '--stdin'],
+            ['check-ignore', '--no-index', '-z', '--stdin'],
-            $this->projectRoot,
+            implode("\x00", array_keys($candidates)),
         );
-        $process->setTimeout(5.0);
-        $process->setInput(implode("\x00", array_keys($candidates)));
-        $process->run();
 
-        $exitCode = $process->getExitCode();
+        // `check-ignore` exits 1 when nothing matched — that is not a failure.
-
+        if ($result['exitCode'] !== 0 && $result['exitCode'] !== 1) {
-        if ($exitCode !== 0 && $exitCode !== 1) {
             throw new MissingDependency('Tia mode', 'git');
         }
 
-        $output = $process->getOutput();
+        $output = $result['output'];
 
         if ($output === '') {
             return $candidates;
@@ -207,27 +200,109 @@ final readonly class ChangedFiles
 
     public function currentBranch(): ?string
     {
-        $process = new Process(['git', 'rev-parse', '--abbrev-ref', 'HEAD'], $this->projectRoot);
+        $output = $this->git->raw(['rev-parse', '--abbrev-ref', 'HEAD']);
-        $process->run();
 
-        if (! $process->isSuccessful()) {
+        if ($output === null) {
             throw new MissingDependency('Tia mode', 'git');
         }
 
-        $branch = trim($process->getOutput());
+        $branch = trim($output);
 
         return $branch === '' || $branch === 'HEAD' ? null : $branch;
     }
 
+    public function defaultBranch(): ?string
+    {
+        $head = $this->git->output(['symbolic-ref', '--short', 'refs/remotes/origin/HEAD']);
+
+        if ($head !== null) {
+            $branch = preg_replace('#^origin/#', '', $head);
+
+            if (is_string($branch) && $branch !== '') {
+                return $branch;
+            }
+        }
+
+        $configured = $this->git->output(['config', '--get', 'init.defaultBranch']);
+
+        if ($configured === null) {
+            return null;
+        }
+
+        $exists = $this->git->hasRef('refs/heads/'.$configured)
+            || $this->git->hasRef('refs/remotes/origin/'.$configured);
+
+        return $exists ? $configured : null;
+    }
+
+    /**
+     * @return list<string>|null
+     */
+    public function branchNames(): ?array
+    {
+        $output = $this->git->raw(['for-each-ref', '--format=%(refname)', 'refs/heads', 'refs/remotes']);
+
+        if ($output === null) {
+            return null;
+        }
+
+        $names = [];
+
+        foreach ($this->splitLines($output) as $ref) {
+            if (str_starts_with($ref, 'refs/heads/')) {
+                $names[substr($ref, strlen('refs/heads/'))] = true;
+
+                continue;
+            }
+
+            if (! str_starts_with($ref, 'refs/remotes/')) {
+                continue;
+            }
+
+            $tail = substr($ref, strlen('refs/remotes/'));
+            $slash = strpos($tail, '/');
+
+            if ($slash === false) {
+                continue;
+            }
+
+            $branch = substr($tail, $slash + 1);
+
+            if ($branch !== '' && $branch !== 'HEAD') {
+                $names[$branch] = true;
+            }
+        }
+
+        return array_keys($names);
+    }
+
+    public function hasRemote(): bool
+    {
+        return $this->git->hasRemote();
+    }
+
+    public function isRepository(): bool
+    {
+        return $this->git->isRepository();
+    }
+
+    public function hasCommits(): bool
+    {
+        return $this->git->hasCommits();
+    }
+
+    /**
+     * Working-tree scans get a longer leash than metadata queries — on a large
+     * repository with a cold cache, `status` and `diff` are not instant.
+     */
+    private function scan(): Git
+    {
+        return $this->git->withTimeout(60.0);
+    }
+
     private function shaIsReachable(string $sha): bool
     {
-        $process = new Process(
+        return $this->git->succeeds(['merge-base', '--is-ancestor', $sha, 'HEAD']);
-            ['git', 'merge-base', '--is-ancestor', $sha, 'HEAD'],
-            $this->projectRoot,
-        );
-        $process->run();
-
-        return $process->getExitCode() === 0;
     }
 
     /**
@@ -235,17 +310,13 @@ final readonly class ChangedFiles
      */
     private function diffSinceSha(string $sha): array
     {
-        $process = new Process(
+        $output = $this->scan()->raw(['diff', '--name-only', '--no-renames', $sha.'..HEAD']);
-            ['git', 'diff', '--name-only', $sha.'..HEAD'],
-            $this->projectRoot,
-        );
-        $process->run();
 
-        if (! $process->isSuccessful()) {
+        if ($output === null) {
             throw new MissingDependency('Tia mode', 'git');
         }
 
-        return $this->splitLines($process->getOutput());
+        return $this->splitLines($output);
     }
 
     /**
@@ -253,18 +324,12 @@ final readonly class ChangedFiles
      */
     private function workingTreeChanges(): array
     {
-        $process = new Process(
+        $output = $this->scan()->raw(['status', '--porcelain', '-z', '--untracked-files=all']);
-            ['git', 'status', '--porcelain', '-z', '--untracked-files=all'],
-            $this->projectRoot,
-        );
-        $process->run();
 
-        if (! $process->isSuccessful()) {
+        if ($output === null) {
             throw new MissingDependency('Tia mode', 'git');
         }
 
-        $output = $process->getOutput();
-
         if ($output === '') {
             return [];
         }
@@ -302,14 +367,13 @@ final readonly class ChangedFiles
 
     public function currentSha(): ?string
     {
-        $process = new Process(['git', 'rev-parse', 'HEAD'], $this->projectRoot);
+        $output = $this->git->raw(['rev-parse', 'HEAD']);
-        $process->run();
 
-        if (! $process->isSuccessful()) {
+        if ($output === null) {
             throw new MissingDependency('Tia mode', 'git');
         }
 
-        $sha = trim($process->getOutput());
+        $sha = trim($output);
 
         return $sha === '' ? null : $sha;
     }

src/Plugins/Tia/CiDefaultBranch.php

@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia;
+
+use Pest\Plugins\Tia\Contracts\Ci;
+
+/**
+ * @internal
+ */
+final class CiDefaultBranch
+{
+    /**
+     * @var array<int, class-string<Ci>>
+     */
+    private const array CIS = [
+        Cis\GitLab::class,
+        Cis\GitHub::class,
+    ];
+
+    public static function detect(): ?string
+    {
+        foreach (self::CIS as $class) {
+            $branch = (new $class)->defaultBranch();
+
+            if ($branch !== null) {
+                return $branch;
+            }
+        }
+
+        return null;
+    }
+}

src/Plugins/Tia/Cis/Concerns/ReadsEnvironment.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia\Cis\Concerns;
+
+/**
+ * @internal
+ */
+trait ReadsEnvironment
+{
+    private function environment(string $name): ?string
+    {
+        $value = getenv($name);
+
+        if (! is_string($value)) {
+            return null;
+        }
+
+        $value = trim($value);
+
+        return $value === '' ? null : $value;
+    }
+}

src/Plugins/Tia/Cis/GitHub.php

@@ -0,0 +1,41 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia\Cis;
+
+use Pest\Plugins\Tia\Cis\Concerns\ReadsEnvironment;
+use Pest\Plugins\Tia\Contracts\Ci;
+
+/**
+ * @internal
+ */
+final readonly class GitHub implements Ci
+{
+    use ReadsEnvironment;
+
+    public function defaultBranch(): ?string
+    {
+        $path = $this->environment('GITHUB_EVENT_PATH');
+
+        if ($path === null || ! is_file($path) || ! is_readable($path)) {
+            return null;
+        }
+
+        $contents = @file_get_contents($path);
+
+        if ($contents === false) {
+            return null;
+        }
+
+        $payload = json_decode($contents, true);
+
+        if (! is_array($payload) || ! is_array($payload['repository'] ?? null)) {
+            return null;
+        }
+
+        $branch = $payload['repository']['default_branch'] ?? null;
+
+        return is_string($branch) && $branch !== '' ? $branch : null;
+    }
+}

src/Plugins/Tia/Cis/GitLab.php

@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia\Cis;
+
+use Pest\Plugins\Tia\Cis\Concerns\ReadsEnvironment;
+use Pest\Plugins\Tia\Contracts\Ci;
+
+/**
+ * @internal
+ */
+final readonly class GitLab implements Ci
+{
+    use ReadsEnvironment;
+
+    public function defaultBranch(): ?string
+    {
+        return $this->environment('CI_DEFAULT_BRANCH');
+    }
+}

src/Plugins/Tia/Configuration.php

@@ -60,6 +60,18 @@ final class Configuration
         return $this;
     }
 
+    /**
+     * @return $this
+     */
+    public function defaultBranch(string $branch): self
+    {
+        /** @var WatchPatterns $watchPatterns */
+        $watchPatterns = Container::getInstance()->get(WatchPatterns::class);
+        $watchPatterns->setDefaultBranch($branch);
+
+        return $this;
+    }
+
     /**
      * @param  array<string, string>  $patterns  glob → project-relative test dir
      * @return $this

src/Plugins/Tia/Contracts/Ci.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia\Contracts;
+
+/**
+ * @internal
+ */
+interface Ci
+{
+    /**
+     * The default branch advertised by this CI, or `null` when the run
+     * does not happen on it — or when it exposes no such information.
+     */
+    public function defaultBranch(): ?string;
+}

src/Plugins/Tia/Enums/ReplayType.php

@@ -29,7 +29,9 @@ enum ReplayType
             $status->isRisky() => self::Risky,
             $status->isSkipped() => self::Skipped,
             $status->isIncomplete() => self::Incomplete,
-            default => self::Failure,
+            $status->isNotice(), $status->isDeprecation(), $status->isWarning() => self::Pass,
+            $status->isFailure(), $status->isError() => self::Failure,
+            default => self::None,
         };
     }
 }

src/Plugins/Tia/Graph.php

@@ -43,11 +43,14 @@ final class Graph
      * @var array<string, array{
      *     sha: ?string,
      *     tree: array<string, string>,
+     *     complete?: bool,
      *     results: array<string, array{status: int, message: string, time: float, assertions?: int, file?: string}>
      * }>
      */
     private array $baselines = [];
 
+    private string $fallbackBranch = 'main';
+
     private readonly string $projectRoot;
 
     /** @var array<string, true>|null */
@@ -116,6 +119,24 @@ final class Graph
         return array_keys($affectedSet);
     }
 
+    /**
+     * @param  array<int, string>  $testFiles  Project-relative paths.
+     * @return list<string>
+     */
+    public function testFilesOnDisk(array $testFiles): array
+    {
+        $root = rtrim($this->projectRoot, DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR;
+        $onDisk = [];
+
+        foreach ($testFiles as $testFile) {
+            if (is_file($root.$testFile)) {
+                $onDisk[] = $testFile;
+            }
+        }
+
+        return $onDisk;
+    }
+
     /**
      * @param  array<int, string>  $changedFiles
      * @return array{0: list<string>, 1: list<string>}
@@ -576,7 +597,12 @@ final class Graph
         return $this->fingerprint;
     }
 
-    public function recordedAtSha(string $branch, string $fallbackBranch = 'main'): ?string
+    public function setFallbackBranch(string $branch): void
+    {
+        $this->fallbackBranch = $branch;
+    }
+
+    public function recordedAtSha(string $branch, ?string $fallbackBranch = null): ?string
     {
         $baseline = $this->baselineFor($branch, $fallbackBranch);
 
@@ -611,7 +637,7 @@ final class Graph
         $this->baselines[$branch]['results'][$testId] = $entry;
     }
 
-    public function getAssertions(string $branch, string $testId, string $fallbackBranch = 'main'): ?int
+    public function getAssertions(string $branch, string $testId, ?string $fallbackBranch = null): ?int
     {
         $baseline = $this->baselineFor($branch, $fallbackBranch);
 
@@ -622,7 +648,18 @@ final class Graph
         return $baseline['results'][$testId]['assertions'];
     }
 
-    public function getResult(string $branch, string $testId, string $fallbackBranch = 'main'): ?TestStatus
+    public function getTime(string $branch, string $testId, ?string $fallbackBranch = null): ?float
+    {
+        $baseline = $this->baselineFor($branch, $fallbackBranch);
+
+        if (! isset($baseline['results'][$testId]['time'])) {
+            return null;
+        }
+
+        return $baseline['results'][$testId]['time'];
+    }
+
+    public function getResult(string $branch, string $testId, ?string $fallbackBranch = null): ?TestStatus
     {
         $baseline = $this->baselineFor($branch, $fallbackBranch);
 
@@ -642,14 +679,14 @@ final class Graph
             6 => TestStatus::warning($r['message']),
             7 => TestStatus::failure($r['message']),
             8 => TestStatus::error($r['message']),
-            default => TestStatus::unknown(),
+            default => null,
         };
     }
 
     /**
      * @return array<int, string>
      */
-    public function testFilesToRerun(string $branch, string $fallbackBranch = 'main'): array
+    public function testFilesToRerun(string $branch, ?string $fallbackBranch = null): array
     {
         $baseline = $this->baselineFor($branch, $fallbackBranch);
         $files = [];
@@ -669,7 +706,7 @@ final class Graph
 
             $rel = $this->relative($file);
 
-            if ($rel !== null) {
+            if ($rel !== null && is_file($this->projectRoot.'/'.$rel)) {
                 $files[$rel] = true;
             }
         }
@@ -677,7 +714,7 @@ final class Graph
         return array_keys($files);
     }
 
-    public function hasUnlocatedTestsToRerun(string $branch, string $fallbackBranch = 'main'): bool
+    public function hasUnlocatedTestsToRerun(string $branch, ?string $fallbackBranch = null): bool
     {
         $baseline = $this->baselineFor($branch, $fallbackBranch);
 
@@ -688,7 +725,11 @@ final class Graph
 
             $file = $result['file'] ?? null;
 
-            if ($file === null || $file === '' || $this->relative($file) === null) {
+            if ($file === null || $file === '') {
+                return true;
+            }
+
+            if ($this->relative($file) === null) {
                 return true;
             }
         }
@@ -712,6 +753,10 @@ final class Graph
             return true;
         }
 
+        if ($testStatus->isUnknown()) {
+            return true;
+        }
+
         $configuration = Registry::get();
 
         if ($testStatus->isRisky()) {
@@ -779,25 +824,70 @@ final class Graph
     /**
      * @return array<string, string>
      */
-    public function lastRunTree(string $branch, string $fallbackBranch = 'main'): array
+    public function lastRunTree(string $branch, ?string $fallbackBranch = null): array
     {
         return $this->baselineFor($branch, $fallbackBranch)['tree'];
     }
 
     /**
-     * @return array{sha: ?string, tree: array<string, string>, results: array<string, array{status: int, message: string, time: float, assertions?: int, file?: string}>}
+     * @return array{sha: ?string, tree: array<string, string>, complete?: bool, results: array<string, array{status: int, message: string, time: float, assertions?: int, file?: string}>}
      */
-    private function baselineFor(string $branch, string $fallbackBranch): array
+    private function baselineFor(string $branch, ?string $fallbackBranch): array
     {
-        if (isset($this->baselines[$branch])) {
+        $fallbackBranch ??= $this->fallbackBranch;
-            return $this->baselines[$branch];
+
+        $fallback = $branch !== $fallbackBranch ? ($this->baselines[$fallbackBranch] ?? null) : null;
+        $own = $this->baselines[$branch] ?? null;
+
+        if ($own === null) {
+            return $fallback ?? ['sha' => null, 'tree' => [], 'results' => []];
         }
 
-        if ($branch !== $fallbackBranch && isset($this->baselines[$fallbackBranch])) {
+        if ($fallback === null) {
-            return $this->baselines[$fallbackBranch];
+            return $own;
         }
 
-        return ['sha' => null, 'tree' => [], 'results' => []];
+        $under = ($own['complete'] ?? false) === true
+            ? $this->withoutFilesCoveredBy($fallback['results'], $own['results'])
+            : $fallback['results'];
+
+        return [
+            'sha' => $own['sha'] ?? $fallback['sha'],
+            'tree' => $own['tree'] !== [] ? $own['tree'] : $fallback['tree'],
+            'results' => array_replace($under, $own['results']),
+        ];
+    }
+
+    /**
+     * @param  array<string, array{status: int, message: string, time: float, assertions?: int, file?: string}>  $results
+     * @param  array<string, array{status: int, message: string, time: float, assertions?: int, file?: string}>  $authoritative
+     * @return array<string, array{status: int, message: string, time: float, assertions?: int, file?: string}>
+     */
+    private function withoutFilesCoveredBy(array $results, array $authoritative): array
+    {
+        $covered = [];
+
+        foreach ($authoritative as $entry) {
+            $file = $entry['file'] ?? null;
+
+            if (is_string($file) && $file !== '') {
+                $covered[$file] = true;
+            }
+        }
+
+        if ($covered === []) {
+            return $results;
+        }
+
+        foreach ($results as $testId => $entry) {
+            $file = $entry['file'] ?? null;
+
+            if (is_string($file) && isset($covered[$file])) {
+                unset($results[$testId]);
+            }
+        }
+
+        return $results;
     }
 
     private function ensureBaseline(string $branch): void
@@ -809,8 +899,9 @@ final class Graph
 
     /**
      * @param  array<string, array<int, string>>  $testToFiles
+     * @param  bool  $keepExisting  Leave already-recorded edge sets alone.
      */
-    public function replaceEdges(array $testToFiles): void
+    public function replaceEdges(array $testToFiles, bool $keepExisting = false): void
     {
         foreach ($testToFiles as $testFile => $sources) {
             $testRel = $this->relative($testFile);
@@ -819,6 +910,10 @@ final class Graph
                 continue;
             }
 
+            if ($keepExisting && ($this->edges[$testRel] ?? []) !== []) {
+                continue;
+            }
+
             $this->edges[$testRel] = [];
 
             foreach ($sources as $source) {
@@ -1377,6 +1472,56 @@ final class Graph
         }
     }
 
+    public function markBaselineComplete(string $branch): void
+    {
+        if (isset($this->baselines[$branch])) {
+            $this->baselines[$branch]['complete'] = true;
+        }
+    }
+
+    public function pruneResultsForMissingFiles(string $branch): void
+    {
+        if (! isset($this->baselines[$branch]['results'])) {
+            return;
+        }
+
+        $root = rtrim($this->projectRoot, DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR;
+
+        foreach ($this->baselines[$branch]['results'] as $testId => $result) {
+            $file = $result['file'] ?? null;
+            if (! is_string($file)) {
+                continue;
+            }
+            if ($file === '') {
+                continue;
+            }
+
+            $rel = $this->relative($file);
+            if ($rel === null) {
+                continue;
+            }
+            if (is_file($root.$rel)) {
+                continue;
+            }
+
+            unset($this->baselines[$branch]['results'][$testId]);
+        }
+    }
+
+    /**
+     * @param  array<int, string>  $keep
+     */
+    public function pruneMissingBranches(array $keep): void
+    {
+        $survivors = array_fill_keys($keep, true);
+
+        foreach (array_keys($this->baselines) as $branch) {
+            if (! isset($survivors[$branch])) {
+                unset($this->baselines[$branch]);
+            }
+        }
+    }
+
     /**
      * Prune baseline result entries whose test files were just executed but whose
      * test IDs are no longer present (e.g. the test method was removed or renamed).
@@ -1422,6 +1567,28 @@ final class Graph
         }
     }
 
+    /**
+     * @return list<string>
+     */
+    public static function branchesIn(string $json): array
+    {
+        $data = json_decode($json, true);
+
+        if (! is_array($data) || ! is_array($data['baselines'] ?? null)) {
+            return [];
+        }
+
+        $branches = [];
+
+        foreach (array_keys($data['baselines']) as $branch) {
+            if (is_string($branch) && $branch !== '') {
+                $branches[] = $branch;
+            }
+        }
+
+        return $branches;
+    }
+
     public static function decode(string $json, string $projectRoot): ?self
     {
         $data = json_decode($json, true);
@@ -1432,10 +1599,10 @@ final class Graph
 
         $graph = new self($projectRoot);
         $graph->fingerprint = is_array($data['fingerprint'] ?? null) ? $data['fingerprint'] : [];
-        $graph->files = is_array($data['files'] ?? null) ? array_values($data['files']) : [];
+        $graph->files = self::decodeFiles($data['files'] ?? null);
         $graph->fileIds = array_flip($graph->files);
-        $graph->edges = is_array($data['edges'] ?? null) ? $data['edges'] : [];
+        $graph->edges = self::decodeEdges($data['edges'] ?? null);
-        $graph->baselines = is_array($data['baselines'] ?? null) ? $data['baselines'] : [];
+        $graph->baselines = self::decodeBaselines($data['baselines'] ?? null);
 
         $graph->testTables = self::decodeStringMap($data['test_tables'] ?? null);
         $graph->testInertiaComponents = self::decodeStringMap($data['test_inertia_components'] ?? null);
@@ -1444,6 +1611,153 @@ final class Graph
         return $graph;
     }
 
+    /**
+     * @return array<int, string>
+     */
+    private static function decodeFiles(mixed $section): array
+    {
+        if (! is_array($section)) {
+            return [];
+        }
+
+        $files = [];
+
+        foreach ($section as $path) {
+            if (is_string($path) && $path !== '') {
+                $files[] = $path;
+            }
+        }
+
+        return $files;
+    }
+
+    /**
+     * @return array<string, array<int, int>>
+     */
+    private static function decodeEdges(mixed $section): array
+    {
+        if (! is_array($section)) {
+            return [];
+        }
+
+        $edges = [];
+
+        foreach ($section as $key => $ids) {
+            $testFile = (string) $key;
+
+            if ($testFile === '') {
+                continue;
+            }
+            if (! is_array($ids)) {
+                continue;
+            }
+
+            $clean = [];
+
+            foreach ($ids as $id) {
+                if (is_int($id)) {
+                    $clean[] = $id;
+                }
+            }
+
+            $edges[$testFile] = $clean;
+        }
+
+        return $edges;
+    }
+
+    /**
+     * @return array<string, array{sha: ?string, tree: array<string, string>, complete?: bool, results: array<string, array{status: int, message: string, time: float, assertions?: int, file?: string}>}>
+     */
+    private static function decodeBaselines(mixed $section): array
+    {
+        if (! is_array($section)) {
+            return [];
+        }
+
+        $baselines = [];
+
+        foreach ($section as $key => $baseline) {
+            $branch = (string) $key;
+
+            if ($branch === '') {
+                continue;
+            }
+            if (! is_array($baseline)) {
+                continue;
+            }
+
+            $sha = $baseline['sha'] ?? null;
+            $tree = [];
+
+            if (is_array($baseline['tree'] ?? null)) {
+                foreach ($baseline['tree'] as $path => $hash) {
+                    if (is_string($path) && is_string($hash)) {
+                        $tree[$path] = $hash;
+                    }
+                }
+            }
+
+            $baselines[$branch] = [
+                'sha' => is_string($sha) ? $sha : null,
+                'tree' => $tree,
+                'results' => self::decodeResults($baseline['results'] ?? null),
+            ];
+
+            if (($baseline['complete'] ?? null) === true) {
+                $baselines[$branch]['complete'] = true;
+            }
+        }
+
+        return $baselines;
+    }
+
+    /**
+     * @return array<string, array{status: int, message: string, time: float, assertions?: int, file?: string}>
+     */
+    private static function decodeResults(mixed $section): array
+    {
+        if (! is_array($section)) {
+            return [];
+        }
+
+        $results = [];
+
+        foreach ($section as $key => $entry) {
+            $testId = (string) $key;
+
+            if ($testId === '') {
+                continue;
+            }
+            if (! is_array($entry)) {
+                continue;
+            }
+            if (! is_int($entry['status'] ?? null)) {
+                continue;
+            }
+
+            $time = $entry['time'] ?? null;
+
+            $result = [
+                'status' => $entry['status'],
+                'message' => is_string($entry['message'] ?? null) ? $entry['message'] : '',
+                'time' => is_int($time) || is_float($time) ? (float) $time : 0.0,
+            ];
+
+            if (is_int($entry['assertions'] ?? null)) {
+                $result['assertions'] = $entry['assertions'];
+            }
+
+            if (is_string($entry['file'] ?? null) && $entry['file'] !== '') {
+                $result['file'] = $entry['file'];
+            }
+
+            $results[$testId] = $result;
+        }
+
+        return $results;
+    }
+
     /**
      * @return array<string, list<string>>
      */

src/Plugins/Tia/Recorder.php

@@ -360,7 +360,9 @@ final class Recorder
             }
 
             $lineKeys = array_keys($lines);
-            if ($lineKeys !== [] && count($covered) === 1 && $covered[0] === max($lineKeys)) {
+            $reportsUnexecutedLines = count($covered) < count($lines);
+
+            if ($reportsUnexecutedLines && $lineKeys !== [] && count($covered) === 1 && $covered[0] === max($lineKeys)) {
                 continue;
             }
 

src/Plugins/Tia/ResultCollector.php

@@ -16,6 +16,9 @@ final class ResultCollector
      */
     private array $results = [];
 
+    /** @var array<string, true> */
+    private array $triggered = [];
+
     private ?string $currentTestId = null;
 
     private ?string $currentTestFile = null;
@@ -35,9 +38,30 @@ final class ResultCollector
             return;
         }
 
+        if (isset($this->triggered[$this->currentTestId])) {
+            $this->refreshTime();
+
+            return;
+        }
+
         $this->record(TestStatus::success());
     }
 
+    public function testTriggeredNotice(string $message): void
+    {
+        $this->recordIssue(TestStatus::notice($message));
+    }
+
+    public function testTriggeredDeprecation(string $message): void
+    {
+        $this->recordIssue(TestStatus::deprecation($message));
+    }
+
+    public function testTriggeredWarning(string $message): void
+    {
+        $this->recordIssue(TestStatus::warning($message));
+    }
+
     public function testFailed(string $message): void
     {
         if ($this->currentTestId === null) {
@@ -91,6 +115,11 @@ final class ResultCollector
         return $this->results;
     }
 
+    public function hasUnfinishedTest(): bool
+    {
+        return $this->currentTestId !== null;
+    }
+
     public function recordAssertions(string $testId, int $assertions): void
     {
         if (isset($this->results[$testId])) {
@@ -111,6 +140,7 @@ final class ResultCollector
     public function reset(): void
     {
         $this->results = [];
+        $this->triggered = [];
         $this->currentTestId = null;
         $this->currentTestFile = null;
         $this->startTime = null;
@@ -123,6 +153,38 @@ final class ResultCollector
         $this->startTime = null;
     }
 
+    private function recordIssue(TestStatus $status): void
+    {
+        if ($this->currentTestId === null) {
+            return;
+        }
+
+        $existing = $this->results[$this->currentTestId]['status'] ?? null;
+
+        if (is_int($existing) && $existing >= $status->asInt()) {
+            return;
+        }
+
+        $this->triggered[$this->currentTestId] = true;
+
+        $this->record($status);
+    }
+
+    private function refreshTime(): void
+    {
+        if ($this->currentTestId === null) {
+            return;
+        }
+        if (! isset($this->results[$this->currentTestId])) {
+            return;
+        }
+        if ($this->startTime === null) {
+            return;
+        }
+
+        $this->results[$this->currentTestId]['time'] = round(microtime(true) - $this->startTime, 3);
+    }
+
     private function record(TestStatus $status): void
     {
         if ($this->currentTestId === null) {

src/Plugins/Tia/TableExtractor.php

@@ -56,7 +56,7 @@ final class TableExtractor
             $tables[strtolower($name)] = true;
         }
 
-        $out = array_keys($tables);
+        $out = array_map(strval(...), array_keys($tables));
         sort($out);
 
         return $out;
@@ -112,7 +112,7 @@ final class TableExtractor
             }
         }
 
-        $out = array_keys($tables);
+        $out = array_map(strval(...), array_keys($tables));
         sort($out);
 
         return $out;

src/Plugins/Tia/WatchPatterns.php

@@ -44,6 +44,8 @@ final class WatchPatterns
 
     private bool $baselined = false;
 
+    private ?string $defaultBranch = null;
+
     public function useDefaults(string $projectRoot): void
     {
         $testPath = TestSuite::getInstance()->testPath;
@@ -177,6 +179,16 @@ final class WatchPatterns
         return $this->baselined;
     }
 
+    public function setDefaultBranch(string $branch): void
+    {
+        $this->defaultBranch = $branch;
+    }
+
+    public function defaultBranch(): ?string
+    {
+        return $this->defaultBranch;
+    }
+
     public function reset(): void
     {
         $this->patterns = [];
@@ -185,6 +197,7 @@ final class WatchPatterns
         $this->locally = false;
         $this->filtered = false;
         $this->baselined = false;
+        $this->defaultBranch = null;
     }
 
     private function keyMatches(string $key, string $file): bool

src/Subscribers/EnsureTiaAssertionsAreRecordedOnFinished.php

@@ -22,7 +22,7 @@ final readonly class EnsureTiaAssertionsAreRecordedOnFinished implements Finishe
 
         if ($test instanceof TestMethod) {
             $this->collector->recordAssertions(
-                $test->className().'::'.$test->methodName(),
+                $test->id(),
                 $event->numberOfAssertionsPerformed(),
             );
         }

src/Subscribers/EnsureTiaResultIsRecordedOnDeprecationTriggered.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Subscribers;
+
+use Pest\Plugins\Tia\ResultCollector;
+use PHPUnit\Event\Test\DeprecationTriggered;
+use PHPUnit\Event\Test\DeprecationTriggeredSubscriber;
+
+/**
+ * @internal
+ */
+final readonly class EnsureTiaResultIsRecordedOnDeprecationTriggered implements DeprecationTriggeredSubscriber
+{
+    public function __construct(private ResultCollector $collector) {}
+
+    public function notify(DeprecationTriggered $event): void
+    {
+        if ($event->wasSuppressed()) {
+            return;
+        }
+
+        $this->collector->testTriggeredDeprecation($event->message());
+    }
+}

src/Subscribers/EnsureTiaResultIsRecordedOnNoticeTriggered.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Subscribers;
+
+use Pest\Plugins\Tia\ResultCollector;
+use PHPUnit\Event\Test\NoticeTriggered;
+use PHPUnit\Event\Test\NoticeTriggeredSubscriber;
+
+/**
+ * @internal
+ */
+final readonly class EnsureTiaResultIsRecordedOnNoticeTriggered implements NoticeTriggeredSubscriber
+{
+    public function __construct(private ResultCollector $collector) {}
+
+    public function notify(NoticeTriggered $event): void
+    {
+        if ($event->wasSuppressed()) {
+            return;
+        }
+
+        $this->collector->testTriggeredNotice($event->message());
+    }
+}

src/Subscribers/EnsureTiaResultIsRecordedOnPhpDeprecationTriggered.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Subscribers;
+
+use Pest\Plugins\Tia\ResultCollector;
+use PHPUnit\Event\Test\PhpDeprecationTriggered;
+use PHPUnit\Event\Test\PhpDeprecationTriggeredSubscriber;
+
+/**
+ * @internal
+ */
+final readonly class EnsureTiaResultIsRecordedOnPhpDeprecationTriggered implements PhpDeprecationTriggeredSubscriber
+{
+    public function __construct(private ResultCollector $collector) {}
+
+    public function notify(PhpDeprecationTriggered $event): void
+    {
+        if ($event->wasSuppressed()) {
+            return;
+        }
+
+        $this->collector->testTriggeredDeprecation($event->message());
+    }
+}

src/Subscribers/EnsureTiaResultIsRecordedOnPhpNoticeTriggered.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Subscribers;
+
+use Pest\Plugins\Tia\ResultCollector;
+use PHPUnit\Event\Test\PhpNoticeTriggered;
+use PHPUnit\Event\Test\PhpNoticeTriggeredSubscriber;
+
+/**
+ * @internal
+ */
+final readonly class EnsureTiaResultIsRecordedOnPhpNoticeTriggered implements PhpNoticeTriggeredSubscriber
+{
+    public function __construct(private ResultCollector $collector) {}
+
+    public function notify(PhpNoticeTriggered $event): void
+    {
+        if ($event->wasSuppressed()) {
+            return;
+        }
+
+        $this->collector->testTriggeredNotice($event->message());
+    }
+}

src/Subscribers/EnsureTiaResultIsRecordedOnPhpWarningTriggered.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Subscribers;
+
+use Pest\Plugins\Tia\ResultCollector;
+use PHPUnit\Event\Test\PhpWarningTriggered;
+use PHPUnit\Event\Test\PhpWarningTriggeredSubscriber;
+
+/**
+ * @internal
+ */
+final readonly class EnsureTiaResultIsRecordedOnPhpWarningTriggered implements PhpWarningTriggeredSubscriber
+{
+    public function __construct(private ResultCollector $collector) {}
+
+    public function notify(PhpWarningTriggered $event): void
+    {
+        if ($event->wasSuppressed()) {
+            return;
+        }
+
+        $this->collector->testTriggeredWarning($event->message());
+    }
+}

src/Subscribers/EnsureTiaResultIsRecordedOnWarningTriggered.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Subscribers;
+
+use Pest\Plugins\Tia\ResultCollector;
+use PHPUnit\Event\Test\WarningTriggered;
+use PHPUnit\Event\Test\WarningTriggeredSubscriber;
+
+/**
+ * @internal
+ */
+final readonly class EnsureTiaResultIsRecordedOnWarningTriggered implements WarningTriggeredSubscriber
+{
+    public function __construct(private ResultCollector $collector) {}
+
+    public function notify(WarningTriggered $event): void
+    {
+        if ($event->wasSuppressed()) {
+            return;
+        }
+
+        $this->collector->testTriggeredWarning($event->message());
+    }
+}

src/Subscribers/EnsureTiaResultsAreCollected.php

@@ -21,7 +21,7 @@ final readonly class EnsureTiaResultsAreCollected implements PreparationStartedS
         $test = $event->test();
 
         if ($test instanceof TestMethod) {
-            $this->collector->testPrepared($test->className().'::'.$test->methodName(), $test->file());
+            $this->collector->testPrepared($test->id(), $test->file());
         }
     }
 }

src/Support/Git.php

@@ -0,0 +1,116 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Support;
+
+use Symfony\Component\Process\Process;
+
+/**
+ * @internal
+ */
+final readonly class Git
+{
+    private const float TIMEOUT = 5.0;
+
+    public function __construct(
+        private ?string $directory = null,
+        private float $timeout = self::TIMEOUT,
+    ) {}
+
+    public function withTimeout(float $timeout): self
+    {
+        return new self($this->directory, $timeout);
+    }
+
+    /**
+     * @param  array<int, string>  $arguments
+     */
+    public function raw(array $arguments): ?string
+    {
+        $result = $this->result($arguments);
+
+        return $result['exitCode'] === 0 ? $result['output'] : null;
+    }
+
+    /**
+     * @param  array<int, string>  $arguments
+     */
+    public function output(array $arguments): ?string
+    {
+        $output = $this->raw($arguments);
+
+        if ($output === null) {
+            return null;
+        }
+
+        $output = trim($output);
+
+        return $output === '' ? null : $output;
+    }
+
+    /**
+     * @param  array<int, string>  $arguments
+     */
+    public function succeeds(array $arguments): bool
+    {
+        return $this->result($arguments)['exitCode'] === 0;
+    }
+
+    /**
+     * @param  array<int, string>  $arguments
+     * @return array{exitCode: int, output: string}
+     */
+    public function result(array $arguments, ?string $input = null): array
+    {
+        $process = new Process(['git', ...$arguments], $this->directory);
+        $process->setTimeout($this->timeout);
+
+        if ($input !== null) {
+            $process->setInput($input);
+        }
+
+        $process->run();
+
+        return [
+            'exitCode' => $process->getExitCode() ?? 1,
+            'output' => $process->getOutput(),
+        ];
+    }
+
+    public function isRepository(): bool
+    {
+        return $this->succeeds(['rev-parse', '--git-dir']);
+    }
+
+    public function hasCommits(): bool
+    {
+        return $this->succeeds(['rev-parse', '--verify', '--quiet', 'HEAD']);
+    }
+
+    public function hasRemote(): bool
+    {
+        return $this->output(['remote']) !== null;
+    }
+
+    public function hasRef(string $ref): bool
+    {
+        return $this->output(['rev-parse', '--verify', '--quiet', $ref]) !== null;
+    }
+
+    public function show(string $sha, string $path): ?string
+    {
+        return $this->raw(['show', $sha.':'.$path]);
+    }
+
+    public function subdirectoryPrefix(): ?string
+    {
+        $prefix = $this->output(['rev-parse', '--show-prefix']);
+
+        if ($prefix === null) {
+            return null;
+        }
+
+        return rtrim(str_replace(DIRECTORY_SEPARATOR, '/', $prefix), '/');
+    }
+}

src/Support/Str.php

@@ -17,6 +17,33 @@ final class Str
 
     private const string PREFIX = '__pest_evaluable_';
 
+    /**
+     * The list of names PHP reserves, and therefore refuses, as class names.
+     *
+     * @see https://github.com/php/php-src/blob/master/Zend/zend_compile.c
+     *
+     * @var array<int, string>
+     */
+    private const array RESERVED_CLASS_NAMES = [
+        'array',
+        'bool',
+        'callable',
+        'false',
+        'float',
+        'int',
+        'iterable',
+        'mixed',
+        'never',
+        'null',
+        'object',
+        'parent',
+        'self',
+        'static',
+        'string',
+        'true',
+        'void',
+    ];
+
     /**
      * Create a (unsecure & non-cryptographically safe) random alpha-numeric
      * string value.
@@ -64,6 +91,35 @@ final class Str
         return (string) preg_replace('/[^a-zA-Z0-9_\x80-\xff]/', '_', $code);
     }
 
+    /**
+     * Determine if the given name is a valid PHP identifier, and therefore may
+     * be used as a single namespace name.
+     */
+    public static function isValidIdentifier(string $name): bool
+    {
+        return preg_match('/^[a-zA-Z_\x80-\xff][a-zA-Z0-9_\x80-\xff]*$/', $name) === 1;
+    }
+
+    /**
+     * Determine if the given name may be declared as a class name by an `eval`.
+     */
+    public static function isValidClassName(string $name): bool
+    {
+        if (! self::isValidIdentifier($name)) {
+            return false;
+        }
+
+        if (in_array(strtolower($name), self::RESERVED_CLASS_NAMES, true)) {
+            return false;
+        }
+
+        $tokens = token_get_all(sprintf('<?php %s;', $name));
+
+        // Anything the lexer sees as a keyword, like `list` or `match`, may not
+        // be used as a class name.
+        return is_array($tokens[1] ?? null) && $tokens[1][0] === T_STRING;
+    }
+
     /**
      * Get the portion of a string before the last occurrence of a given value.
      */

src/TestCaseFilters/GitDirtyTestCaseFilter.php

@@ -8,8 +8,8 @@ use Pest\Contracts\TestCaseFilter;
 use Pest\Exceptions\MissingDependency;
 use Pest\Exceptions\NoDirtyTestsFound;
 use Pest\Panic;
+use Pest\Support\Git;
 use Pest\TestSuite;
-use Symfony\Component\Process\Process;
 
 final class GitDirtyTestCaseFilter implements TestCaseFilter
 {
@@ -52,14 +52,13 @@ final class GitDirtyTestCaseFilter implements TestCaseFilter
      */
     private function loadChangedFiles(): void
     {
-        $process = new Process(['git', 'status', '--short', '--', '*.php']);
+        $status = new Git(timeout: 60.0)->raw(['status', '--short', '--', '*.php']);
-        $process->run();
 
-        if (! $process->isSuccessful()) {
+        if ($status === null) {
             throw new MissingDependency('Filter by dirty files', 'git');
         }
 
-        $output = preg_split('/\R+/', $process->getOutput(), flags: PREG_SPLIT_NO_EMPTY);
+        $output = preg_split('/\R+/', $status, flags: PREG_SPLIT_NO_EMPTY);
         assert(is_array($output));
 
         $dirtyFiles = [];

tests/.pest/snapshots/Visual/Help/visual_snapshot_of_help_command_output.snap

@@ -1,5 +1,5 @@
 
-  Pest Testing Framework 5.0.2.  
+  Pest Testing Framework 5.0.4.  
 
   USAGE: pest <file> [options]  
 

tests/.pest/snapshots/Visual/Version/visual_snapshot_of_help_command_output.snap

@@ -1,3 +1,3 @@
 
-  Pest Testing Framework 5.0.2.  
+  Pest Testing Framework 5.0.4.  
 

tests/.snapshots/Failure.php.inc

@@ -1,27 +1,27 @@
-##teamcity[testSuiteStarted name='Tests/tests/Failure' locationHint='pest_qn://tests/.tests/Failure.php' flowId='1234']
+##teamcity[testSuiteStarted name='Tests/Fixtures/Suites/Failure' locationHint='pest_qn://tests/Fixtures/Suites/Failure.php' flowId='1234']
 ##teamcity[testCount count='8' flowId='1234']
-##teamcity[testStarted name='it can fail with comparison' locationHint='pest_qn://tests/.tests/Failure.php::it can fail with comparison' flowId='1234']
+##teamcity[testStarted name='it can fail with comparison' locationHint='pest_qn://tests/Fixtures/Suites/Failure.php::it can fail with comparison' flowId='1234']
-##teamcity[testFailed name='it can fail with comparison' message='Failed asserting that true matches expected false.' details='at tests/.tests/Failure.php:6' type='comparisonFailure' actual='true' expected='false' flowId='1234']
+##teamcity[testFailed name='it can fail with comparison' message='Failed asserting that true matches expected false.' details='at tests/Fixtures/Suites/Failure.php:6' type='comparisonFailure' actual='true' expected='false' flowId='1234']
 ##teamcity[testFinished name='it can fail with comparison' duration='100000' flowId='1234']
-##teamcity[testStarted name='it can be ignored because of no assertions' locationHint='pest_qn://tests/.tests/Failure.php::it can be ignored because of no assertions' flowId='1234']
+##teamcity[testStarted name='it can be ignored because of no assertions' locationHint='pest_qn://tests/Fixtures/Suites/Failure.php::it can be ignored because of no assertions' flowId='1234']
 ##teamcity[testIgnored name='it can be ignored because of no assertions' message='This test did not perform any assertions' details='' flowId='1234']
 ##teamcity[testFinished name='it can be ignored because of no assertions' duration='100000' flowId='1234']
-##teamcity[testStarted name='it can be ignored because it is skipped' locationHint='pest_qn://tests/.tests/Failure.php::it can be ignored because it is skipped' flowId='1234']
+##teamcity[testStarted name='it can be ignored because it is skipped' locationHint='pest_qn://tests/Fixtures/Suites/Failure.php::it can be ignored because it is skipped' flowId='1234']
 ##teamcity[testIgnored name='it can be ignored because it is skipped' message='This test was ignored.' details='' flowId='1234']
 ##teamcity[testFinished name='it can be ignored because it is skipped' duration='100000' flowId='1234']
-##teamcity[testStarted name='it can fail' locationHint='pest_qn://tests/.tests/Failure.php::it can fail' flowId='1234']
+##teamcity[testStarted name='it can fail' locationHint='pest_qn://tests/Fixtures/Suites/Failure.php::it can fail' flowId='1234']
-##teamcity[testFailed name='it can fail' message='oh noo' details='at tests/.tests/Failure.php:18' flowId='1234']
+##teamcity[testFailed name='it can fail' message='oh noo' details='at tests/Fixtures/Suites/Failure.php:18' flowId='1234']
 ##teamcity[testFinished name='it can fail' duration='100000' flowId='1234']
-##teamcity[testStarted name='it throws exception' locationHint='pest_qn://tests/.tests/Failure.php::it throws exception' flowId='1234']
+##teamcity[testStarted name='it throws exception' locationHint='pest_qn://tests/Fixtures/Suites/Failure.php::it throws exception' flowId='1234']
-##teamcity[testFailed name='it throws exception' message='Exception: test error' details='at tests/.tests/Failure.php:22' flowId='1234']
+##teamcity[testFailed name='it throws exception' message='Exception: test error' details='at tests/Fixtures/Suites/Failure.php:22' flowId='1234']
 ##teamcity[testFinished name='it throws exception' duration='100000' flowId='1234']
-##teamcity[testStarted name='it is not done yet' locationHint='pest_qn://tests/.tests/Failure.php::it is not done yet' flowId='1234']
+##teamcity[testStarted name='it is not done yet' locationHint='pest_qn://tests/Fixtures/Suites/Failure.php::it is not done yet' flowId='1234']
 ##teamcity[testFinished name='it is not done yet' duration='100000' flowId='1234']
-##teamcity[testStarted name='build this one.' locationHint='pest_qn://tests/.tests/Failure.php::build this one.' flowId='1234']
+##teamcity[testStarted name='build this one.' locationHint='pest_qn://tests/Fixtures/Suites/Failure.php::build this one.' flowId='1234']
 ##teamcity[testFinished name='build this one.' duration='100000' flowId='1234']
-##teamcity[testStarted name='it is passing' locationHint='pest_qn://tests/.tests/Failure.php::it is passing' flowId='1234']
+##teamcity[testStarted name='it is passing' locationHint='pest_qn://tests/Fixtures/Suites/Failure.php::it is passing' flowId='1234']
 ##teamcity[testFinished name='it is passing' duration='100000' flowId='1234']
-##teamcity[testSuiteFinished name='Tests/tests/Failure' flowId='1234']
+##teamcity[testSuiteFinished name='Tests/Fixtures/Suites/Failure' flowId='1234']
 
   Tests:    3 failed, 1 risky, 2 todos, 1 skipped, 1 passed (3 assertions)
   Duration: 1.00s

tests/.snapshots/SuccessOnly.php.inc

@@ -1,18 +1,18 @@
-##teamcity[testSuiteStarted name='Tests/tests/SuccessOnly' locationHint='pest_qn://tests/.tests/SuccessOnly.php' flowId='1234']
+##teamcity[testSuiteStarted name='Tests/Fixtures/Suites/SuccessOnly' locationHint='pest_qn://tests/Fixtures/Suites/SuccessOnly.php' flowId='1234']
 ##teamcity[testCount count='4' flowId='1234']
-##teamcity[testStarted name='it can pass with comparison' locationHint='pest_qn://tests/.tests/SuccessOnly.php::it can pass with comparison' flowId='1234']
+##teamcity[testStarted name='it can pass with comparison' locationHint='pest_qn://tests/Fixtures/Suites/SuccessOnly.php::it can pass with comparison' flowId='1234']
 ##teamcity[testFinished name='it can pass with comparison' duration='100000' flowId='1234']
-##teamcity[testStarted name='can also pass' locationHint='pest_qn://tests/.tests/SuccessOnly.php::can also pass' flowId='1234']
+##teamcity[testStarted name='can also pass' locationHint='pest_qn://tests/Fixtures/Suites/SuccessOnly.php::can also pass' flowId='1234']
 ##teamcity[testFinished name='can also pass' duration='100000' flowId='1234']
-##teamcity[testSuiteStarted name='can pass with dataset' locationHint='pest_qn://tests/.tests/SuccessOnly.php::can pass with dataset' flowId='1234']
+##teamcity[testSuiteStarted name='can pass with dataset' locationHint='pest_qn://tests/Fixtures/Suites/SuccessOnly.php::can pass with dataset' flowId='1234']
-##teamcity[testStarted name='can pass with dataset with data set "(true)"' locationHint='pest_qn://tests/.tests/SuccessOnly.php::can pass with dataset with data set "(true)"' flowId='1234']
+##teamcity[testStarted name='can pass with dataset with data set "(true)"' locationHint='pest_qn://tests/Fixtures/Suites/SuccessOnly.php::can pass with dataset with data set "(true)"' flowId='1234']
 ##teamcity[testFinished name='can pass with dataset with data set "(true)"' duration='100000' flowId='1234']
 ##teamcity[testSuiteFinished name='can pass with dataset' flowId='1234']
-##teamcity[testSuiteStarted name='`block` → can pass with dataset in describe block' locationHint='pest_qn://tests/.tests/SuccessOnly.php::`block` → can pass with dataset in describe block' flowId='1234']
+##teamcity[testSuiteStarted name='`block` → can pass with dataset in describe block' locationHint='pest_qn://tests/Fixtures/Suites/SuccessOnly.php::`block` → can pass with dataset in describe block' flowId='1234']
-##teamcity[testStarted name='`block` → can pass with dataset in describe block with data set "(1)"' locationHint='pest_qn://tests/.tests/SuccessOnly.php::`block` → can pass with dataset in describe block with data set "(1)"' flowId='1234']
+##teamcity[testStarted name='`block` → can pass with dataset in describe block with data set "(1)"' locationHint='pest_qn://tests/Fixtures/Suites/SuccessOnly.php::`block` → can pass with dataset in describe block with data set "(1)"' flowId='1234']
 ##teamcity[testFinished name='`block` → can pass with dataset in describe block with data set "(1)"' duration='100000' flowId='1234']
 ##teamcity[testSuiteFinished name='`block` → can pass with dataset in describe block' flowId='1234']
-##teamcity[testSuiteFinished name='Tests/tests/SuccessOnly' flowId='1234']
+##teamcity[testSuiteFinished name='Tests/Fixtures/Suites/SuccessOnly' flowId='1234']
 
   Tests:    4 passed (4 assertions)
   Duration: 1.00s

tests/.snapshots/allows-to-run-a-directory.txt

@@ -1,17 +1,4 @@
-   WARN  Tests\Fixtures\CollisionTest
-  - error
-  - success
-
    PASS  Tests\Fixtures\DirectoryWithTests\ExampleTest
   ✓ it example 1
 
-   PASS  Tests\Fixtures\ExampleTest
+  Tests:    1 passed (1 assertions)
-  ✓ it example 2
-
-   WARN  Tests\Fixtures\Inheritance\Base\ExampleTest
-  - example
-
-   PASS  Tests\Fixtures\Inheritance\ExampleTest
-  ✓ example
-
-  Tests:    3 skipped, 3 passed (3 assertions)

tests/.snapshots/success.txt

@@ -1565,6 +1565,229 @@
   ✓ it allows performing no expectations without being risky
   ✓ a "describe" group of tests → it allows performing no expectations without being risky
 
+   PASS  Tests\Features\Tia
+  ✓ it does not run user hooks when replaying cached skipped and incomplete results
+
+   PASS  Tests\Features\Tia\BranchShapes
+  ✓ a branch name git allows is a branch key TIA can hold with dataset "slashes"
+  ✓ a branch name git allows is a branch key TIA can hold with dataset "dots"
+  ✓ a branch name git allows is a branch key TIA can hold with dataset "unicode"
+  ✓ a branch name git allows is a branch key TIA can hold with dataset "digits"
+  ✓ a branch name git allows is a branch key TIA can hold with dataset "underscores"
+  ✓ a branch name git allows is a branch key TIA can hold with dataset "very long"
+  ✓ a branch differing from the default only in case gets its own key
+  ✓ a branch that only lives on the remote keeps its baseline
+  ✓ a branch checked out in a worktree keeps its baseline
+  ✓ deleting many branches reclaims every one of their baselines with dataset "sequential"
+  ✓ deleting many branches reclaims every one of their baselines with dataset "parallel"
+  ✓ a narrowed run does not reclaim anything
+  ✓ a detached HEAD does not reclaim anything either
+  ✓ the default branch baseline survives every branch that comes and goes
+  ✓ a project below the git repository root refuses to run and writes nothing with dataset "sequential"
+  ✓ a project below the git repository root refuses to run and writes nothing with dataset "parallel"
+  ✓ a repository with no commits says so, and leaves plain runs alone
+  ✓ a directory with no repository at all still asks for git
+
+   PASS  Tests\Features\Tia\CompleteRunWriteTier
+  ✓ a complete run prunes a deleted test with dataset "sequential"
+  ✓ a complete run prunes a deleted test with dataset "parallel"
+  ✓ a complete run records nothing for a test file the graph does not know
+  ✓ a partial run records nothing for a test file the graph does not know
+  ✓ a truncated run does not prune with dataset "sequential"
+  ✓ a truncated run does not prune with dataset "parallel"
+  ✓ a green bail run is complete
+  ✓ --no-tia refreshes results without enabling tia with dataset "sequential"
+  ✓ --no-tia refreshes results without enabling tia with dataset "parallel"
+  ✓ a plain run refreshes the results it executed with dataset "sequential"
+  ✓ a plain run refreshes the results it executed with dataset "parallel"
+  ✓ a parallel replay keeps the recorded time of tests that did not run
+  ✓ a run that never enables tia creates no graph with dataset "plain"
+  ✓ a run that never enables tia creates no graph with dataset "filtered"
+  ✓ a run that never enables tia creates no graph with dataset "parallel filtered"
+  ✓ a test edit narrows to the affected file and replays the rest
+  ✓ a parallel run merges worker results into the parent baseline
+
+   PASS  Tests\Features\Tia\CoveragePiggyback
+  ✓ a coverage report does not found a dependency graph with dataset "pest coverage"
+  ✓ a coverage report does not found a dependency graph with dataset "phpunit coverage report"
+  ✓ a coverage report does not found a dependency graph with dataset "parallel"
+  ✓ a plain run after a coverage run records the whole project scope
+  ✓ a coverage report leaves the edges of an existing graph alone
+
+   PASS  Tests\Features\Tia\DefaultBranchReplay
+  ✓ replays the default branch baseline on a new branch
+  ✓ replays whatever the default branch is called with ('main')
+  ✓ replays whatever the default branch is called with ('master')
+  ✓ replays whatever the default branch is called with ('trunk')
+  ✓ replays whatever the default branch is called with ('develop')
+  ✓ replays on a second new branch too
+  ✓ writes nothing on a second run on the same branch
+  ✓ replays on a branch whose name contains slashes
+  ✓ replays again once back on the default branch
+  ✓ replays on a new branch when tia is enabled by configuration
+  ✓ a narrowed run on a new branch does not cost the fallback with dataset "sequential"
+  ✓ a narrowed run on a new branch does not cost the fallback with dataset "parallel"
+  ✓ replays inside a worktree on a new branch
+
+   PASS  Tests\Features\Tia\DefaultBranchResolution
+  ✓ a declared default branch beats autodetection
+  ✓ a declared default branch that does not exist degrades to a full run
+  ✓ a renamed default branch replays and writes under its new name
+  ✓ the CI provider names the default branch where the checkout cannot
+  ✓ GitLab names the default branch through its own variable
+  ✓ a lone recorded baseline names the default branch
+  ✓ a default branch nothing can name is refused rather than guessed
+  ✓ an init.defaultBranch naming a branch that exists is still trusted
+  ✓ a repository with no remote is refused rather than silently re-run
+  ✓ a remote-less repository holding one baseline is not refused
+  ✓ a declared default branch stands in for a missing remote
+  ✓ tia still requires git
+  ✓ a plain run outside a repository creates no baseline
+  ✓ the default branch is resolved once per run, not once per test
+
+   PASS  Tests\Features\Tia\DefaultBranchWriteTier
+  ✓ narrows to the affected tests on a new branch
+  ✓ filtered mode reads the fallback too
+  ✓ filtered mode finds nothing to do on a clean green feature branch
+  ✓ filtered mode falls back to a full replay when a cached failure cannot be located
+  ✓ filtered mode finds nothing to do on the default branch itself
+  ✓ a detached HEAD replays without minting a branch key
+  ✓ a detached HEAD does not write into the default branch baseline with dataset "sequential"
+  ✓ a detached HEAD does not write into the default branch baseline with dataset "parallel"
+  ✓ the branch that ran gets its own key and the default branch keeps its baseline
+  ✓ the fallback reaches parallel workers
+
+   PASS  Tests\Features\Tia\FilteredMode
+  ✓ re-runs a cached failure on a clean tree
+  ✓ an explicit path turns filtered mode off
+  ✓ filtered mode runs the whole suite when there is no baseline
+  ✓ filtered mode finds nothing to do in parallel either
+  ✓ a corrupt graph is reported and does not crash the run
+  ✓ --parallel --retry is refused and leaves the graph alone
+
+   PASS  Tests\Features\Tia\HostileState
+  ✓ a graph mangled beyond use still lets the suite run with dataset "empty"
+  ✓ a graph mangled beyond use still lets the suite run with dataset "truncated"
+  ✓ a graph mangled beyond use still lets the suite run with dataset "not json"
+  ✓ a graph mangled beyond use still lets the suite run with dataset "json scalar"
+  ✓ a graph mangled beyond use still lets the suite run with dataset "json list"
+  ✓ a graph mangled beyond use still lets the suite run with dataset "json null"
+  ✓ a graph mangled beyond use still lets the suite run with dataset "empty object"
+  ✓ a graph mangled beyond use still lets the suite run with dataset "nul bytes"
+  ✓ a graph whose shape is wrong everywhere is repaired rather than trusted with dataset "sequential"
+  ✓ a graph whose shape is wrong everywhere is repaired rather than trusted with dataset "parallel"
+  ✓ a cached status this build cannot interpret is re-run, not replayed with dataset "below the range"
+  ✓ a cached status this build cannot interpret is re-run, not replayed with dataset "one past the range"
+  ✓ a cached status this build cannot interpret is re-run, not replayed with dataset "far past the range"
+  ✓ a cached status this build cannot interpret is re-run, not replayed with dataset "huge"
+  ✓ a cached status with no replay of its own does not fail the run with dataset "notice"
+  ✓ a cached status with no replay of its own does not fail the run with dataset "deprecation"
+  ✓ a cached status with no replay of its own does not fail the run with dataset "warning"
+  ✓ a cached skip or todo replays with its message intact with dataset "skipped"
+  ✓ a cached skip or todo replays with its message intact with dataset "incomplete"
+  ✓ a cached failure with a multi-line message re-runs rather than replaying the text
+  ✓ a result pointing outside the project is not addressable and widens the run
+  ✓ an edge pointing at a file id that does not exist is ignored
+  ✓ a graph from a schema this build does not know is rebuilt, not read
+  ✓ graph.json being a directory does not stop the run
+  ✓ a state dir it cannot write to still replays
+
+   PASS  Tests\Features\Tia\IssueStatuses
+  ✓ a triggered issue is recorded as itself, not as a pass with dataset "sequential" / dataset "deprecation"
+  ✓ a triggered issue is recorded as itself, not as a pass with dataset "sequential" / dataset "notice"
+  ✓ a triggered issue is recorded as itself, not as a pass with dataset "sequential" / dataset "warning"
+  ✓ a triggered issue is recorded as itself, not as a pass with dataset "parallel" / dataset "deprecation"
+  ✓ a triggered issue is recorded as itself, not as a pass with dataset "parallel" / dataset "notice"
+  ✓ a triggered issue is recorded as itself, not as a pass with dataset "parallel" / dataset "warning"
+  ✓ a cached deprecation still fails the run that asked to fail on one with dataset "sequential"
+  ✓ a cached deprecation still fails the run that asked to fail on one with dataset "parallel"
+  ✓ replaying a cached issue does not downgrade it to a pass with dataset "sequential"
+  ✓ replaying a cached issue does not downgrade it to a pass with dataset "parallel"
+  ✓ a failure outranks an issue triggered on the way to it
+  ✓ a skip outranks an issue triggered on the way to it
+  ✓ a suppressed issue is not recorded
+
+   PASS  Tests\Features\Tia\PartialRunWriteTier
+  ✓ a filtered run rewrites only the test that ran
+  ✓ a filtered run under --tia announces that tia does not apply
+  ✓ a test suffix narrows the tier even though every test runs
+  ✓ a dirty run narrows to the uncommitted test edit
+  ✓ filtered mode yields to an explicit filter
+  ✓ an env flag narrows exactly like the option it mirrors with ('PEST_TIA')
+  ✓ an env flag narrows exactly like the option it mirrors with ('PEST_TIA_FILTERED')
+  ✓ a partial run does not purge the graph even with --fresh
+  ✓ --no-tia does not stop a partial run from refreshing its own entry
+  ✓ two partial runs each keep the other entry
+  ✓ a shard is a partial run
+  ✓ a parallel partial run records the test that ran, like a sequential one
+
+   PASS  Tests\Features\Tia\RemoteBaseline
+  ✓ a published baseline is fetched instead of recorded locally
+  ✓ a fetched baseline that will not decode is discarded rather than trusted
+  ✓ a fetched baseline recorded against another tree is not used
+  ✓ an artifact without a graph in it fails loudly
+  ✓ a baseline that cannot be authenticated for fails loudly
+  ✓ a workflow or artifact that is not there fails loudly
+  ✓ a network failure warns and lets the suite run with dataset "querying the runs"
+  ✓ a network failure warns and lets the suite run with dataset "downloading the artifact"
+  ✓ no published baseline yet starts a cooldown, and a corrupt cooldown does not break the run
+
+   PASS  Tests\Features\Tia\SelectionPaths
+  ✓ a committed rename selects the tests that depended on the old path with dataset "sequential"
+  ✓ a committed rename selects the tests that depended on the old path with dataset "parallel"
+  ✓ an affected test file that is gone does not strand a filtered run with dataset "sequential"
+  ✓ an affected test file that is gone does not strand a filtered run with dataset "parallel"
+  ✓ a plain run reclaims the edge of a test file that is gone
+  ✓ a changed view selects the test that rendered it
+  ✓ a changed partial selects the test that rendered its ancestor with dataset "direct @include"
+  ✓ a changed partial selects the test that rendered its ancestor with dataset "transitive @include"
+  ✓ a changed partial selects the test that rendered its ancestor with dataset "x- component"
+  ✓ a changed partial selects the test that rendered its ancestor with dataset "include cycle"
+  ✓ a changed Inertia page selects the test that rendered its component
+  ✓ a changed shared JS module selects the tests of the pages that import it
+  ✓ a changed frontend runtime file selects every Inertia test
+
+   PASS  Tests\Features\Tia\StateReclamation
+  ✓ a detached HEAD does not purge the graph on structural drift with dataset "sequential"
+  ✓ a detached HEAD does not purge the graph on structural drift with dataset "parallel"
+  ✓ a detached HEAD does not purge the graph with --fresh either with dataset "sequential"
+  ✓ a detached HEAD does not purge the graph with --fresh either with dataset "parallel"
+  ✓ a detached HEAD leaves an unreadable graph for a checkout that can rebuild it
+  ✓ a cached failure whose test file was deleted stops widening later runs with dataset "sequential"
+  ✓ a cached failure whose test file was deleted stops widening later runs with dataset "parallel"
+  ✓ a complete run reclaims the entry and the edge of a deleted test file with dataset "sequential"
+  ✓ a complete run reclaims the entry and the edge of a deleted test file with dataset "parallel"
+  ✓ a pruned result does not come back from the fallback with dataset "sequential"
+  ✓ a pruned result does not come back from the fallback with dataset "parallel"
+  ✓ the fallback still reaches a branch that has never run a test file
+  ✓ a branch that git no longer knows loses its baseline
+  ✓ an unknown cached status is re-run rather than replayed as a failure with dataset "unknown"
+  ✓ an unknown cached status is re-run rather than replayed as a failure with dataset "future"
+  ✓ an unknown cached status is re-run rather than replayed as a failure with dataset "garbage"
+  ✓ a cached notice, deprecation or warning does not replay as a failure with dataset "notice"
+  ✓ a cached notice, deprecation or warning does not replay as a failure with dataset "deprecation"
+  ✓ a cached notice, deprecation or warning does not replay as a failure with dataset "warning"
+  ✓ a malformed baseline entry cannot break the run with dataset "sequential"
+  ✓ a malformed baseline entry cannot break the run with dataset "parallel"
+  ✓ a run torn down mid-file does not prune the tests it never reached with dataset "sequential"
+  ✓ a run torn down mid-file does not prune the tests it never reached with dataset "parallel"
+  ✓ a fatal error mid-file is a test error, not a truncation with dataset "sequential"
+  ✓ a fatal error mid-file is a test error, not a truncation with dataset "parallel"
+  ✓ a green complete run leaves the graph exactly as it found it with dataset "bail"
+  ✓ a green complete run leaves the graph exactly as it found it with dataset "stop-on-failure"
+  ✓ a green complete run leaves the graph exactly as it found it with dataset "compact"
+  ✓ a green complete run leaves the graph exactly as it found it with dataset "parallel bail"
+  ✓ a green complete run leaves the graph exactly as it found it with dataset "parallel one process"
+  ✓ a green complete run leaves the graph exactly as it found it with dataset "parallel more processes than files"
+  ✓ --tia --no-tia is a plain run that still refreshes what it executed with dataset "sequential"
+  ✓ --tia --no-tia is a plain run that still refreshes what it executed with dataset "parallel"
+  ✓ --fresh on a partial run neither purges nor prunes with dataset "sequential"
+  ✓ --fresh on a partial run neither purges nor prunes with dataset "parallel"
+  ✓ a second green run on a feature branch writes nothing at all with dataset "sequential"
+  ✓ a second green run on a feature branch writes nothing at all with dataset "parallel"
+  ✓ a graph whose recorded commit is gone is re-anchored, not warned about forever with dataset "sequential"
+  ✓ a graph whose recorded commit is gone is re-anchored, not warned about forever with dataset "parallel"
+
    PASS  Tests\Features\Ticket
   ✓ it may be associated with an ticket #1, #2
   ✓ nested → it may be associated with an ticket #1, #4, #5, #6, #3
@@ -1908,6 +2131,11 @@
   ✓ activateLinkTracking() → it tracks linked sources across consecutive tests
   ✓ activateLinkTracking() → it records nothing while inactive
 
+   PASS  Tests\Unit\Plugins\Tia\ResultKey
+  ✓ it keys a result per dataset row rather than per method
+  ✓ it records assertions against the same per-dataset key
+  ✓ it leaves a test without a dataset keyed by class and method
+
    PASS  Tests\Unit\Plugins\Tia\TableExtractor
   ✓ fromSql() → it extracts tables from plain DML
   ✓ fromSql() → it extracts tables from joins
@@ -1916,10 +2144,12 @@
   ✓ fromSql() → it records the table, not the schema, for qualified identifiers
   ✓ fromSql() → it handles quoted identifiers
   ✓ fromSql() → it ignores schema metadata tables
+  ✓ fromSql() → it does not leak int keys for numeric identifiers
   ✓ fromSql() → it returns nothing for non-DML statements
   ✓ fromMigrationSource() → it extracts tables from Schema builder calls
   ✓ fromMigrationSource() → it extracts tables from raw DDL statements
   ✓ fromMigrationSource() → it records the table, not the schema, in qualified DDL and DML
+  ✓ fromMigrationSource() → it does not leak int keys for numeric table names
   ✓ fromMigrationSource() → it extracts tables from DB::table calls
 
    PASS  Tests\Unit\Plugins\Tia\TestPaths
@@ -2153,6 +2383,7 @@
   ✓ a parallel test can extend another test with same name
   ✓ parallel reports invalid datasets as failures
   ✓ parallel can have multiple exclude-groups
+  ✓ parallel can have multiple groups
 
    PASS  Tests\Visual\ParallelNestedDatasets
   ✓ parallel loads nested datasets from nested directories
@@ -2186,4 +2417,4 @@
   ✓ pass with dataset with ('my-datas-set-value')
   ✓ within describe → pass with dataset with ('my-datas-set-value')
 
-  Tests:    1 deprecated, 4 warnings, 5 incomplete, 2 notices, 40 todos, 35 skipped, 1542 passed (3375 assertions)
+  Tests:    1 deprecated, 4 warnings, 5 incomplete, 2 notices, 40 todos, 35 skipped, 1743 passed (3953 assertions)

tests/Features/DatasetProviderErrors.php

@@ -18,27 +18,27 @@ $run = function (string $target): array {
 };
 
 test('reports missing datasets as errors for a single file run', function () use ($run): void {
-    $result = $run('tests/.tests/IssueOnly.php');
+    $result = $run('tests/Fixtures/Suites/IssueOnly.php');
 
     expect($result['output'])
-        ->toContain("A dataset with the name `missing` does not exist. You can create it using `dataset('missing', ['a', 'b']);`.")
+        ->toContain("A dataset with the name [missing] does not exist. You can create it using `dataset('missing', ['a', 'b']);`.")
         ->toContain('FAILED')
         ->toContain('Tests:    1 failed')
         ->and($result['code'])->not->toBe(0);
 })->skipOnWindows();
 
 test('reports missing datasets as errors alongside passing tests', function () use ($run): void {
-    $result = $run('tests/.tests/IssueWithPassing.php');
+    $result = $run('tests/Fixtures/Suites/IssueWithPassing.php');
 
     expect($result['output'])
-        ->toContain("A dataset with the name `missing` does not exist. You can create it using `dataset('missing', ['a', 'b']);`.")
+        ->toContain("A dataset with the name [missing] does not exist. You can create it using `dataset('missing', ['a', 'b']);`.")
         ->toContain('1 passed')
         ->toContain('1 failed')
         ->and($result['code'])->not->toBe(0);
 })->skipOnWindows();
 
 test('reports dataset closure exceptions as errors', function () use ($run): void {
-    $result = $run('tests/.tests/DatasetClosureThrows.php');
+    $result = $run('tests/Fixtures/Suites/DatasetClosureThrows.php');
 
     expect($result['output'])
         ->toContain('boom from dataset')

tests/Features/DatasetsTests.php

@@ -10,12 +10,12 @@ beforeEach(function (): void {
 });
 
 it('throws exception if dataset does not exist', function (): void {
-    expect(fn () => DatasetsRepository::resolve(['first'], __FILE__))->toThrow(DatasetDoesNotExist::class, "A dataset with the name `first` does not exist. You can create it using `dataset('first', ['a', 'b']);`.");
+    expect(fn () => DatasetsRepository::resolve(['first'], __FILE__))->toThrow(DatasetDoesNotExist::class, "A dataset with the name [first] does not exist. You can create it using `dataset('first', ['a', 'b']);`.");
 });
 
 it('throws exception if dataset already exist', function (): void {
     DatasetsRepository::set('second', [[]], __DIR__);
-    expect(fn () => DatasetsRepository::set('second', [[]], __DIR__))->toThrow(DatasetAlreadyExists::class, 'A dataset with the name `second` already exists in scope ['.__DIR__.'].');
+    expect(fn () => DatasetsRepository::set('second', [[]], __DIR__))->toThrow(DatasetAlreadyExists::class, 'A dataset with the name [second] already exists in scope ['.__DIR__.'].');
 });
 
 it('sets closures', function (): void {

tests/Features/Flaky.php

@@ -142,7 +142,7 @@ it('works as higher order test')
 
 it('fails after exhausting all retries', function (): void {
     $process = new Process(
-        ['php', 'bin/pest', 'tests/.tests/FlakyFailure.php'],
+        ['php', 'bin/pest', 'tests/Fixtures/Suites/FlakyFailure.php'],
         dirname(__DIR__, 2),
         ['COLLISION_PRINTER' => 'DefaultPrinter', 'COLLISION_IGNORE_DURATION' => 'true', 'PAO_DISABLE' => '1'],
     );

tests/Features/Tia.php

@@ -0,0 +1,84 @@
+<?php
+
+use Pest\Plugins\Tia;
+use Pest\Plugins\Tia\ChangedFiles;
+use Pest\Plugins\Tia\FileState;
+use Pest\Plugins\Tia\Fingerprint;
+use Pest\Plugins\Tia\Graph;
+use Pest\Plugins\Tia\Storage;
+use Pest\Support\Str;
+use Symfony\Component\Process\Process;
+
+it('does not run user hooks when replaying cached skipped and incomplete results', function (): void {
+    $projectRoot = dirname(__DIR__, 2);
+    $home = sys_get_temp_dir().'/pest-tia-'.bin2hex(random_bytes(8));
+    $fixture = 'tests/Fixtures/Suites/TiaReplayHooks.php';
+
+    mkdir($home, 0755, true);
+
+    try {
+        $changedFiles = new ChangedFiles($projectRoot);
+        $branch = $changedFiles->currentBranch() ?? 'main';
+        $sha = $changedFiles->currentSha();
+
+        $id = fn (string $description): string => 'P\Tests\Fixtures\Suites\TiaReplayHooks::'.Str::evaluable($description);
+
+        $graph = new Graph($projectRoot);
+        $graph->setFingerprint(Fingerprint::compute($projectRoot));
+        $graph->setRecordedAtSha($branch, $sha);
+        // Hashes the working tree as it stands, so the replay sees nothing as changed.
+        $graph->setLastRunTree($branch, $changedFiles->snapshotTree($changedFiles->since($sha) ?? []));
+        $graph->markKnownTestFiles([$fixture]);
+        $graph->setResult($branch, $id('replayed pass'), 0, '', 0.01, 1, $fixture);
+        $graph->setResult($branch, $id('replayed skip'), 1, 'cached skip', 0.01, 0, $fixture);
+        $graph->setResult($branch, $id('replayed incomplete'), 2, 'cached incomplete', 0.01, 0, $fixture);
+
+        $json = $graph->encode();
+
+        expect($json)->not->toBeNull();
+
+        $originalHome = getenv('HOME');
+        putenv('HOME='.$home);
+
+        try {
+            $storage = new FileState(Storage::tempDir($projectRoot));
+        } finally {
+            putenv($originalHome === false ? 'HOME' : 'HOME='.$originalHome);
+        }
+
+        expect($storage->write(Tia::KEY_GRAPH, (string) $json))->toBeTrue();
+
+        $process = new Process(
+            ['php', 'bin/pest', '--configuration', 'tests/Fixtures/Suites/TiaReplayHooks.xml', '--tia'],
+            $projectRoot,
+            [
+                'COLLISION_PRINTER' => 'DefaultPrinter',
+                'COLLISION_IGNORE_DURATION' => 'true',
+                'PARATEST' => 0,
+                'PAO_DISABLE' => '1',
+                'HOME' => $home,
+            ],
+        );
+
+        $process->run();
+
+        $output = removeAnsiEscapeSequences($process->getOutput().$process->getErrorOutput());
+
+        // Both hooks throw, so the run stays green only if neither one ran.
+        expect($output)->toContain('3 replayed')
+            ->and($output)->not->toContain('must not run for replayed tests')
+            ->and($output)->toContain('1 incomplete, 1 skipped, 1 passed')
+            ->and($process->getExitCode())->toBe(0);
+    } finally {
+        $paths = new RecursiveIteratorIterator(
+            new RecursiveDirectoryIterator($home, FilesystemIterator::SKIP_DOTS),
+            RecursiveIteratorIterator::CHILD_FIRST,
+        );
+
+        foreach ($paths as $path) {
+            $path->isDir() ? @rmdir($path->getPathname()) : @unlink($path->getPathname());
+        }
+
+        @rmdir($home);
+    }
+})->skipOnWindows();

tests/Features/Tia/BranchShapes.php

@@ -0,0 +1,197 @@
+<?php
+
+declare(strict_types=1);
+
+use Tests\Fixtures\Tia\Project;
+
+afterEach(function (): void {
+    Project::destroyAll();
+});
+
+test('a branch name git allows is a branch key TIA can hold', function (string $branch): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->switchTo($branch, new: true);
+
+    $result = $project->pest('--tia');
+    $delta = $project->delta();
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($result->uncached())->toBe(0, $result->describe())
+        ->and($project->branchKeys())->toBe(['master', $branch])
+        ->and($delta->baselineUntouched('master'))->toBeTrue($delta->summary());
+})->with([
+    'slashes' => 'feature/deep/nesting',
+    'dots' => 'release.1.2.x',
+    'unicode' => 'feature-café-日本',
+    'digits' => '12345',
+    'underscores' => 'feature_x_y',
+    'very long' => 'feature-'.str_repeat('x', 180),
+])->skipOnWindows();
+
+test('a branch differing from the default only in case gets its own key', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->switchTo('MASTER-2', new: true);
+
+    $result = $project->pest('--tia');
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($project->branchKeys())->toBe(['master', 'MASTER-2']);
+})->skipOnWindows();
+
+test('a branch that only lives on the remote keeps its baseline', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->switchTo('remote-only', new: true);
+    $project->pest('--tia');
+
+    $project->git()->switchTo('master');
+    $project->git()->run(['update-ref', 'refs/remotes/origin/remote-only', 'HEAD']);
+    $project->git()->run(['branch', '-D', 'remote-only']);
+
+    $project->pest('--tia');
+
+    expect($project->branchKeys())->toBe(['master', 'remote-only']);
+})->skipOnWindows();
+
+test('a branch checked out in a worktree keeps its baseline', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->switchTo('wt-branch', new: true);
+    $project->pest('--tia');
+
+    $project->git()->switchTo('master');
+    $project->git()->run(['worktree', 'add', '--quiet', $project->path().'-wt', 'wt-branch']);
+
+    $project->pest('--tia');
+
+    $project->git()->run(['worktree', 'remove', '--force', $project->path().'-wt']);
+
+    expect($project->branchKeys())->toBe(['master', 'wt-branch']);
+})->skipOnWindows();
+
+test('deleting many branches reclaims every one of their baselines', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    foreach (range(1, 4) as $index) {
+        $project->git()->switchTo('feature-'.$index, new: true);
+        $project->pest('--tia', ...$arguments);
+    }
+
+    expect($project->branchKeys())->toHaveCount(5);
+
+    $project->git()->switchTo('master');
+
+    foreach (range(1, 4) as $index) {
+        $project->git()->run(['branch', '-D', 'feature-'.$index]);
+    }
+
+    $project->pest('--tia', ...$arguments);
+
+    expect($project->branchKeys())->toBe(['master']);
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->skipOnWindows();
+
+test('a narrowed run does not reclaim anything', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->switchTo('feature-x', new: true);
+    $project->pest('--tia');
+
+    $project->git()->switchTo('master');
+    $project->git()->run(['branch', '-D', 'feature-x']);
+
+    $project->snapshot();
+    $project->pest('--tia', '--filter=adds two numbers');
+    $delta = $project->delta();
+
+    expect($project->branchKeys())->toBe(['master', 'feature-x'])
+        ->and($delta->isResultsOnly())->toBeTrue($delta->summary());
+})->skipOnWindows();
+
+test('a detached HEAD does not reclaim anything either', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->switchTo('feature-x', new: true);
+    $project->pest('--tia');
+
+    $project->git()->switchTo('master');
+    $project->git()->run(['branch', '-D', 'feature-x']);
+    $project->git()->detach();
+
+    $project->snapshot();
+    $project->pest('--tia');
+    $delta = $project->delta();
+
+    expect($project->branchKeys())->toBe(['master', 'feature-x'])
+        ->and($delta->isHardSuppressed())->toBeTrue($delta->summary());
+})->skipOnWindows();
+
+test('the default branch baseline survives every branch that comes and goes', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->switchTo('feature-x', new: true);
+    $project->pest('--tia');
+
+    $project->git()->switchTo('master');
+    $project->git()->run(['branch', '-D', 'feature-x']);
+
+    $project->snapshot();
+    $result = $project->pest('--tia');
+    $delta = $project->delta();
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($delta->writtenCount())->toBe(0, $delta->summary())
+        ->and($delta->added())->toBe(0, $delta->summary())
+        ->and($delta->removed())->toBe(0, $delta->summary())
+        ->and($project->graph()['baselines']['master']['results'])->toHaveCount(Project::TOTAL_TESTS);
+})->skipOnWindows();
+
+test('a project below the git repository root refuses to run and writes nothing', function (array $arguments): void {
+    $project = Project::make('master');
+    $nested = $project->nested();
+
+    $result = $project->pestIn($nested, '--tia', ...$arguments);
+
+    expect($result->exitCode)->toBe(1, $result->describe())
+        ->and($result->output)->toContain('Tia mode requires the git repository root')
+        ->and($project->path('.home/.pest'))->not->toBeDirectory()
+        ->and($nested.DIRECTORY_SEPARATOR.'.pest')->not->toBeDirectory();
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->skipOnWindows();
+
+test('a repository with no commits says so, and leaves plain runs alone', function (): void {
+    $project = Project::withoutGit();
+    $project->git()->run(['init', '--quiet']);
+    $project->git()->run(['checkout', '--quiet', '-b', 'master']);
+    $project->git()->addOrigin();
+
+    $tia = $project->pest('--tia');
+
+    expect($tia->exitCode)->toBe(1, $tia->describe())
+        ->and($tia->output)->toContain('Tia mode requires at least one commit')
+        ->and($tia->output)->not->toContain('requires [git]')
+        ->and($project->graphExists())->toBeFalse();
+
+    $plain = $project->pest();
+
+    expect($plain->exitCode)->toBe(0, $plain->describe())
+        ->and($plain->tally())->toContain(Project::TOTAL_TESTS.' passed');
+})->skipOnWindows();
+
+test('a directory with no repository at all still asks for git', function (): void {
+    $project = Project::withoutGit();
+
+    $result = $project->pest('--tia');
+
+    expect($result->exitCode)->toBe(1, $result->describe())
+        ->and($result->output)->toContain('requires [git]')
+        ->and($project->graphExists())->toBeFalse();
+})->skipOnWindows();

tests/Features/Tia/CompleteRunWriteTier.php

@@ -0,0 +1,234 @@
+<?php
+
+declare(strict_types=1);
+
+use Tests\Fixtures\Tia\Project;
+
+afterEach(function (): void {
+    Project::destroyAll();
+});
+
+test('a complete run prunes a deleted test', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->write('tests/Unit/GreeterTest.php', <<<'PHP'
+        <?php
+
+        declare(strict_types=1);
+
+        use Fixture\App\Greeter;
+
+        test('greets a person', function (): void {
+            expect((new Greeter)->greet('Nuno'))->toBe('Hello, Nuno!');
+        });
+        PHP);
+
+    $result = $project->pest(...$arguments);
+    $delta = $project->delta();
+
+    expect($result->tally())->toContain('5 passed')
+        ->and($delta->removed())->toBe(1, $delta->summary())
+        ->and($delta->added())->toBe(0, $delta->summary())
+        ->and($delta->structureMoved())->toBeFalse($delta->summary());
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->skipOnWindows();
+
+test('a complete run records nothing for a test file the graph does not know', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->write('tests/Unit/BrandNewTest.php', <<<'PHP'
+        <?php
+
+        declare(strict_types=1);
+
+        test('brand new thing', function (): void {
+            expect(true)->toBeTrue();
+        });
+        PHP);
+
+    $result = $project->pest();
+    $delta = $project->delta();
+
+    expect($result->tally())->toContain('7 passed')
+        ->and($delta->added())->toBe(0, $delta->summary())
+        ->and($delta->removed())->toBe(0, $delta->summary())
+        ->and($delta->writtenCount())->toBe(Project::TOTAL_TESTS, $delta->summary());
+})->skipOnWindows();
+
+test('a partial run records nothing for a test file the graph does not know', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->write('tests/Unit/BrandNewTest.php', <<<'PHP'
+        <?php
+
+        declare(strict_types=1);
+
+        test('brand new thing', function (): void {
+            expect(true)->toBeTrue();
+        });
+        PHP);
+
+    $result = $project->pest('--filter=brand new thing');
+    $delta = $project->delta();
+
+    expect($result->tally())->toContain('1 passed')
+        ->and($delta->added())->toBe(0, $delta->summary())
+        ->and($delta->writtenCount())->toBe(0, $delta->summary())
+        ->and($delta->isResultsOnly())->toBeTrue($delta->summary());
+})->skipOnWindows();
+
+test('a truncated run does not prune', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->write('tests/Unit/GreeterTest.php', <<<'PHP'
+        <?php
+
+        declare(strict_types=1);
+
+        use Fixture\App\Greeter;
+
+        test('greets a person', function (): void {
+            expect((new Greeter)->greet('Nuno'))->toBe('Goodbye, Nuno!');
+        });
+
+        test('greets the world', function (): void {
+            expect((new Greeter)->greet('world'))->toBe('Hello, world!');
+        });
+        PHP);
+
+    $result = $project->pest('--bail', ...$arguments);
+    $delta = $project->delta();
+
+    expect($result->exitCode)->toBe(1, $result->describe())
+        ->and($result->tally())->toContain('1 failed')
+        ->and($delta->removed())->toBe(0, $delta->summary())
+        ->and($delta->structureMoved())->toBeFalse($delta->summary());
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->skipOnWindows();
+
+test('a green bail run is complete', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $result = $project->pest('--bail');
+    $delta = $project->delta();
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($delta->writtenCount())->toBe(Project::TOTAL_TESTS, $delta->summary())
+        ->and($delta->removed())->toBe(0, $delta->summary())
+        ->and($delta->isResultsOnly())->toBeTrue($delta->summary());
+})->skipOnWindows();
+
+test('--no-tia refreshes results without enabling tia', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $result = $project->pest('--tia', '--no-tia', ...$arguments);
+    $delta = $project->delta();
+
+    expect($result->output)->not->toContain('Experimental TIA mode enabled')
+        ->and($result->tally())->toContain(Project::TOTAL_TESTS.' passed')
+        ->and($delta->writtenCount())->toBe(Project::TOTAL_TESTS, $delta->summary())
+        ->and($delta->isResultsOnly())->toBeTrue($delta->summary());
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->skipOnWindows();
+
+test('a plain run refreshes the results it executed', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $result = $project->pest(...$arguments);
+    $delta = $project->delta();
+
+    expect($result->tally())->toContain(Project::TOTAL_TESTS.' passed')
+        ->and($delta->writtenCount())->toBe(Project::TOTAL_TESTS, $delta->summary())
+        ->and($delta->isResultsOnly())->toBeTrue($delta->summary());
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->skipOnWindows();
+
+test('a parallel replay keeps the recorded time of tests that did not run', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->pest('--tia', '--parallel', '--processes=2');
+
+    $delta = $project->delta();
+
+    expect($delta->writtenCount())->toBe(0, $delta->summary())
+        ->and($delta->isResultsOnly())->toBeTrue($delta->summary());
+})->skipOnWindows();
+
+test('a run that never enables tia creates no graph', function (array $arguments): void {
+    $project = Project::make('master');
+
+    $result = $project->pest(...$arguments);
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($project->graphExists())->toBeFalse();
+})->with([
+    'plain' => [[]],
+    'filtered' => [['--filter=adds two numbers']],
+    'parallel filtered' => [['--parallel', '--processes=2', '--filter=adds two numbers']],
+])->skipOnWindows();
+
+test('a test edit narrows to the affected file and replays the rest', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->write('tests/Unit/GreeterTest.php', <<<'PHP'
+        <?php
+
+        declare(strict_types=1);
+
+        use Fixture\App\Greeter;
+
+        test('greets a person', function (): void {
+            expect((new Greeter)->greet('Nuno'))->toBe('Hello, Nuno!');
+            expect((new Greeter)->greet('Nuno'))->toBeString();
+        });
+
+        test('greets the world', function (): void {
+            expect((new Greeter)->greet('world'))->toBe('Hello, world!');
+        });
+        PHP);
+
+    $result = $project->pest('--tia');
+    $delta = $project->delta();
+
+    expect($result->affected())->toBe(2, $result->describe())
+        ->and($result->replayed())->toBe(4, $result->describe())
+        ->and($delta->writtenCount())->toBe(2, $delta->summary())
+        ->and($delta->edgesMoved())->toBeFalse($delta->summary())
+        ->and($delta->removed())->toBe(0, $delta->summary());
+})->skipOnWindows();
+
+test('a parallel run merges worker results into the parent baseline', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->write('tests/Unit/GreeterTest.php', <<<'PHP'
+        <?php
+
+        declare(strict_types=1);
+
+        use Fixture\App\Greeter;
+
+        test('greets a person', function (): void {
+            expect((new Greeter)->greet('Nuno'))->toBe('Hello, Nuno!');
+            expect((new Greeter)->greet('Nuno'))->toBeString();
+        });
+
+        test('greets the world', function (): void {
+            expect((new Greeter)->greet('world'))->toBe('Hello, world!');
+        });
+        PHP);
+
+    $result = $project->pest('--tia', '--parallel', '--processes=2');
+    $delta = $project->delta();
+
+    expect($result->affected())->toBe(2, $result->describe())
+        ->and($result->replayed())->toBe(4, $result->describe())
+        ->and($delta->writtenCount())->toBe(2, $delta->summary())
+        ->and($delta->edgesMoved())->toBeFalse($delta->summary())
+        ->and($delta->removed())->toBe(0, $delta->summary());
+})->skipOnWindows();

tests/Features/Tia/CoveragePiggyback.php

@@ -0,0 +1,53 @@
+<?php
+
+declare(strict_types=1);
+
+use Tests\Fixtures\Tia\Project;
+
+afterEach(function (): void {
+    Project::destroyAll();
+});
+
+test('a coverage report does not found a dependency graph', function (array $arguments): void {
+    $project = Project::make('master');
+
+    $project->pest('--tia', ...$arguments);
+
+    expect($project->graphExists())->toBeFalse();
+})->with([
+    'pest coverage' => [['--coverage']],
+    'phpunit coverage report' => [['--coverage-text']],
+    'parallel' => [['--coverage', '--parallel', '--processes=2']],
+])->skipOnWindows();
+
+test('a plain run after a coverage run records the whole project scope', function (): void {
+    $project = Project::make('master');
+
+    $project->pest('--tia', '--coverage');
+    $project->pest('--tia');
+
+    $graph = $project->graph();
+
+    if ($graph === null) {
+        expect($project->graphExists())->toBeFalse();
+
+        return;
+    }
+
+    expect(array_keys($graph['edges']))->toEqualCanonicalizing(array_keys(Project::EDGES))
+        ->and($graph['files'])->toContain('tests/Unit/CalculatorTest.php')
+        ->and($graph['files'])->toContain('app/Calculator.php');
+})->skipOnWindows();
+
+test('a coverage report leaves the edges of an existing graph alone', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->pest('--tia', '--coverage');
+    $delta = $project->delta();
+
+    expect($delta->edgesMoved())->toBeFalse($delta->summary())
+        ->and($delta->filesMoved())->toBeFalse($delta->summary())
+        ->and($delta->removed())->toBe(0, $delta->summary())
+        ->and($delta->added())->toBe(0, $delta->summary());
+})->skipOnWindows();

tests/Features/Tia/DefaultBranchReplay.php

@@ -0,0 +1,139 @@
+<?php
+
+declare(strict_types=1);
+
+use Tests\Fixtures\Tia\Project;
+
+afterEach(function (): void {
+    Project::destroyAll();
+});
+
+test('replays the default branch baseline on a new branch', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->switchTo('feature-x', new: true);
+
+    $result = $project->pest('--tia');
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($result->uncached())->toBe(0, $result->describe())
+        ->and($result->exitCode)->toBe(0);
+})->skipOnWindows();
+
+test('replays whatever the default branch is called', function (string $defaultBranch): void {
+    $project = Project::make($defaultBranch);
+    $project->seed($defaultBranch);
+
+    $project->git()->switchTo('feature-x', new: true);
+
+    $result = $project->pest('--tia');
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($result->uncached())->toBe(0, $result->describe());
+})->with(['main', 'master', 'trunk', 'develop'])->skipOnWindows();
+
+test('replays on a second new branch too', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->switchTo('feature-x', new: true);
+    $project->pest('--tia');
+
+    $project->git()->switchTo('master');
+    $project->git()->switchTo('feature-y', new: true);
+
+    $result = $project->pest('--tia');
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($result->uncached())->toBe(0, $result->describe());
+})->skipOnWindows();
+
+test('writes nothing on a second run on the same branch', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->switchTo('feature-x', new: true);
+    $project->pest('--tia');
+
+    $project->snapshot();
+    $result = $project->pest('--tia');
+    $delta = $project->delta();
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($delta->writtenCount())->toBe(0, $delta->summary())
+        ->and($delta->isResultsOnly())->toBeTrue($delta->summary());
+})->skipOnWindows();
+
+test('replays on a branch whose name contains slashes', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->switchTo('feature/x/y', new: true);
+
+    $result = $project->pest('--tia');
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($result->uncached())->toBe(0, $result->describe())
+        ->and($project->branchKeys())->toContain('feature/x/y');
+})->skipOnWindows();
+
+test('replays again once back on the default branch', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->switchTo('feature-x', new: true);
+    $project->pest('--tia');
+
+    $project->git()->switchTo('master');
+
+    $project->snapshot();
+    $result = $project->pest('--tia');
+    $delta = $project->delta();
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($result->uncached())->toBe(0, $result->describe())
+        ->and($delta->writtenCount())->toBe(0, $delta->summary())
+        ->and($delta->isResultsOnly())->toBeTrue($delta->summary());
+})->skipOnWindows();
+
+test('replays on a new branch when tia is enabled by configuration', function (): void {
+    $project = Project::make('master', overlay: 'always-enabled');
+    $project->seed('master');
+
+    $project->git()->switchTo('feature-x', new: true);
+
+    $result = $project->pest();
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($result->uncached())->toBe(0, $result->describe())
+        ->and($project->branchKeys())->toBe(['master', 'feature-x']);
+})->skipOnWindows();
+
+test('a narrowed run on a new branch does not cost the fallback', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->switchTo('feature-x', new: true);
+    $project->pest(...$arguments);
+
+    $result = $project->pest('--tia');
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($result->uncached())->toBe(0, $result->describe());
+})->with([
+    'sequential' => [['--filter=adds two numbers']],
+    'parallel' => [['--parallel', '--processes=2', '--filter=adds two numbers']],
+])->skipOnWindows();
+
+test('replays inside a worktree on a new branch', function (): void {
+    $project = Project::make('master');
+    $worktree = $project->worktree('feature-worktree');
+
+    $project->seedFor($worktree, 'master');
+
+    $result = $project->pestIn($worktree, '--tia');
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($result->uncached())->toBe(0, $result->describe());
+})->skipOnWindows();

tests/Features/Tia/DefaultBranchResolution.php

@@ -0,0 +1,223 @@
+<?php
+
+declare(strict_types=1);
+
+use Symfony\Component\Process\ExecutableFinder;
+use Tests\Fixtures\Tia\Project;
+
+afterEach(function (): void {
+    Project::destroyAll();
+});
+
+test('a declared default branch beats autodetection', function (): void {
+    $project = Project::make('develop', overlay: 'configured-default-branch');
+    $project->seed('master');
+
+    $project->git()->switchTo('feature-x', new: true);
+
+    $result = $project->pest('--tia');
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($result->uncached())->toBe(0, $result->describe());
+})->skipOnWindows();
+
+test('a declared default branch that does not exist degrades to a full run', function (): void {
+    $project = Project::make('master', overlay: 'unknown-default-branch');
+    $project->seed('master');
+
+    $project->git()->switchTo('feature-x', new: true);
+
+    $result = $project->pest('--tia');
+
+    expect($result->uncached())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($result->exitCode)->toBe(0, $result->describe())
+        ->and($project->branchKeys())->toBe(['master', 'feature-x']);
+})->skipOnWindows();
+
+test('a renamed default branch replays and writes under its new name', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->rename('master', 'main');
+
+    $result = $project->pest('--tia');
+    $delta = $project->delta();
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($result->uncached())->toBe(0, $result->describe())
+        ->and($project->branchKeys())->toBe(['master', 'main'])
+        ->and($delta->baselineUntouched('master'))->toBeTrue($delta->summary())
+        ->and($delta->writtenCount())->toBe(0, $delta->summary());
+})->skipOnWindows();
+
+test('the CI provider names the default branch where the checkout cannot', function (): void {
+    $project = Project::make('master');
+    $project->git()->unsetOriginHead();
+    $project->seed('master');
+    $project->addBaseline('legacy');
+
+    $project->git()->switchTo('feature-x', new: true);
+
+    $project->write('.home/event.json', (string) json_encode([
+        'repository' => ['default_branch' => 'master'],
+    ]));
+
+    $result = $project->pestWithEnvironment($project->path(), [
+        'GITHUB_EVENT_PATH' => $project->path('.home/event.json'),
+    ], '--tia');
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($result->uncached())->toBe(0, $result->describe());
+})->skipOnWindows();
+
+test('GitLab names the default branch through its own variable', function (): void {
+    $project = Project::make('master');
+    $project->git()->unsetOriginHead();
+    $project->seed('master');
+    $project->addBaseline('legacy');
+
+    $project->git()->switchTo('feature-x', new: true);
+
+    $result = $project->pestWithEnvironment($project->path(), [
+        'CI_DEFAULT_BRANCH' => 'master',
+    ], '--tia');
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($result->uncached())->toBe(0, $result->describe());
+})->skipOnWindows();
+
+test('a lone recorded baseline names the default branch', function (): void {
+    $project = Project::make('master');
+    $project->git()->unsetOriginHead();
+    $project->git()->config('init.defaultBranch', 'main');
+    $project->seed('master');
+
+    $project->git()->switchTo('feature-x', new: true);
+
+    $result = $project->pest('--tia');
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($result->uncached())->toBe(0, $result->describe());
+})->skipOnWindows();
+
+test('a default branch nothing can name is refused rather than guessed', function (): void {
+    $project = Project::make('master');
+    $project->git()->unsetOriginHead();
+    $project->git()->config('init.defaultBranch', 'main');
+
+    $project->git()->switchTo('feature-x', new: true);
+
+    $result = $project->pest('--tia');
+
+    expect($result->output)->toContain('Tia mode could not determine the default branch.')
+        ->and($result->output)->toContain('git remote set-head origin --auto')
+        ->and($result->exitCode)->toBe(1, $result->describe())
+        ->and($project->graphExists())->toBeFalse();
+})->skipOnWindows();
+
+test('an init.defaultBranch naming a branch that exists is still trusted', function (): void {
+    $project = Project::make('master');
+    $project->git()->unsetOriginHead();
+    $project->git()->config('init.defaultBranch', 'master');
+
+    $project->git()->switchTo('feature-x', new: true);
+
+    $result = $project->pest('--tia');
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->output)->not->toContain('could not determine the default branch')
+        ->and($project->branchKeys())->not->toContain('master');
+})->skipOnWindows();
+
+test('a repository with no remote is refused rather than silently re-run', function (): void {
+    $project = Project::make('master');
+
+    $project->git()->removeOrigin();
+
+    $project->git()->switchTo('feature-x', new: true);
+
+    $result = $project->pest('--tia');
+
+    expect($result->output)->toContain('Tia mode requires a repository with a remote.')
+        ->and($result->exitCode)->toBe(1, $result->describe());
+})->skipOnWindows();
+
+test('a remote-less repository holding one baseline is not refused', function (): void {
+    $project = Project::make('master');
+
+    $project->git()->removeOrigin();
+    $project->seed('master');
+
+    $project->git()->switchTo('feature-x', new: true);
+
+    $result = $project->pest('--tia');
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($result->uncached())->toBe(0, $result->describe());
+})->skipOnWindows();
+
+test('a declared default branch stands in for a missing remote', function (): void {
+    $project = Project::make('master', overlay: 'configured-default-branch');
+
+    $project->git()->removeOrigin();
+    $project->seed('master');
+
+    $project->git()->switchTo('feature-x', new: true);
+
+    $result = $project->pest('--tia');
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($result->uncached())->toBe(0, $result->describe());
+})->skipOnWindows();
+
+test('tia still requires git', function (): void {
+    $project = Project::withoutGit();
+
+    $result = $project->pest('--tia');
+
+    expect($result->output)->toContain('The feature [Tia mode] requires [git].')
+        ->and($result->exitCode)->not->toBe(0);
+})->skipOnWindows();
+
+test('a plain run outside a repository creates no baseline', function (): void {
+    $project = Project::withoutGit();
+
+    $result = $project->pest();
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->tally())->toContain(Project::TOTAL_TESTS.' passed')
+        ->and($project->graphExists())->toBeFalse()
+        ->and($project->graphDir())->not->toBeDirectory();
+})->skipOnWindows();
+
+test('the default branch is resolved once per run, not once per test', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->switchTo('feature-x', new: true);
+
+    $git = (new ExecutableFinder)->find('git');
+
+    expect($git)->not->toBeNull();
+
+    $log = $project->path('git-calls.log');
+    $project->write('shim/git', implode("\n", [
+        '#!/bin/sh',
+        'echo "$@" >> '.escapeshellarg($log),
+        'exec '.escapeshellarg((string) $git).' "$@"',
+        '',
+    ]));
+    chmod($project->path('shim/git'), 0755);
+
+    $result = $project->pestWithEnvironment($project->path(), [
+        'PATH' => $project->path('shim').':'.getenv('PATH'),
+    ], '--tia');
+
+    $calls = file_exists($log) ? explode("\n", trim((string) file_get_contents($log))) : [];
+    $resolutions = array_filter($calls, fn (string $call): bool => str_contains($call, 'symbolic-ref')
+        || str_contains($call, 'init.defaultBranch'));
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($calls)->not->toBeEmpty('the git shim was never reached')
+        ->and($resolutions)->toHaveCount(1, implode("\n", $calls));
+})->skipOnWindows();

tests/Features/Tia/DefaultBranchWriteTier.php

@@ -0,0 +1,160 @@
+<?php
+
+declare(strict_types=1);
+
+use Tests\Fixtures\Tia\Project;
+
+afterEach(function (): void {
+    Project::destroyAll();
+});
+
+test('narrows to the affected tests on a new branch', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->switchTo('feature-x', new: true);
+
+    $project->write('tests/Unit/GreeterTest.php', <<<'PHP'
+        <?php
+
+        declare(strict_types=1);
+
+        use Fixture\App\Greeter;
+
+        test('greets a person', function (): void {
+            expect((new Greeter)->greet('Nuno'))->toBe('Hello, Nuno!');
+            expect((new Greeter)->greet('Nuno'))->toBeString();
+        });
+
+        test('greets the world', function (): void {
+            expect((new Greeter)->greet('world'))->toBe('Hello, world!');
+        });
+        PHP);
+
+    $result = $project->pest('--tia');
+    $delta = $project->delta();
+
+    expect($result->affected())->toBe(2, $result->describe())
+        ->and($result->replayed())->toBe(4, $result->describe())
+        ->and($result->exitCode)->toBe(0, $result->describe())
+        ->and($project->branchKeys())->toBe(['master', 'feature-x'])
+        ->and($delta->baselineUntouched('master'))->toBeTrue($delta->summary())
+        ->and($delta->edgesMoved())->toBeFalse($delta->summary());
+})->skipOnWindows();
+
+test('filtered mode reads the fallback too', function (): void {
+    $project = Project::make('master');
+
+    $project->seed('master', failing: ['adds two numbers']);
+
+    $project->git()->switchTo('feature-x', new: true);
+
+    $result = $project->pest('--tia', '--filtered');
+
+    expect($result->output)->toContain('from 1 previously unsuccessful test')
+        ->and($result->output)->not->toContain('No affected tests found')
+        ->and($result->tally())->toContain('2 passed');
+})->skipOnWindows();
+
+test('filtered mode finds nothing to do on a clean green feature branch', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->switchTo('feature-x', new: true);
+
+    $result = $project->pest('--tia', '--filtered');
+    $delta = $project->delta();
+
+    expect($result->output)->toContain('No affected tests found')
+        ->and($result->exitCode)->toBe(0, $result->describe())
+        ->and($delta->isHardSuppressed())->toBeTrue($delta->summary());
+})->skipOnWindows();
+
+test('filtered mode falls back to a full replay when a cached failure cannot be located', function (): void {
+    $project = Project::make('master');
+
+    $project->seed('master', failing: ['adds two numbers']);
+
+    $project->mutateGraph(function (array $graph): array {
+        $testId = Project::testId('tests/Unit/CalculatorTest.php', 'adds two numbers');
+
+        $graph['baselines']['master']['results'][$testId]['file'] = '/build/agent/tests/Unit/DeletedTest.php';
+
+        return $graph;
+    });
+
+    $project->git()->switchTo('feature-x', new: true);
+
+    $result = $project->pest('--tia', '--filtered');
+
+    expect($result->output)->toContain('Some cached tests due a re-run could not be located on disk.')
+        ->and($result->output)->toContain('Running the full suite with replay instead of a filtered run.')
+        ->and($result->output)->not->toContain('No affected tests found');
+})->skipOnWindows();
+
+test('filtered mode finds nothing to do on the default branch itself', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $result = $project->pest('--tia', '--filtered');
+    $delta = $project->delta();
+
+    expect($result->output)->toContain('No affected tests found')
+        ->and($result->exitCode)->toBe(0, $result->describe())
+        ->and($delta->isHardSuppressed())->toBeTrue($delta->summary());
+})->skipOnWindows();
+
+test('a detached HEAD replays without minting a branch key', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->detach();
+
+    $result = $project->pest('--tia');
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($result->uncached())->toBe(0, $result->describe())
+        ->and($project->branchKeys())->toBe(['master']);
+})->skipOnWindows();
+
+test('a detached HEAD does not write into the default branch baseline', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->detach();
+    $project->pest(...$arguments);
+
+    $delta = $project->delta();
+
+    expect($delta->baselineUntouched('master'))->toBeTrue($delta->summary())
+        ->and($project->branchKeys())->toBe(['master']);
+})->with([
+    'sequential' => [['--filter=adds two numbers']],
+    'parallel' => [['--parallel', '--processes=2', '--filter=adds two numbers']],
+])->skipOnWindows();
+
+test('the branch that ran gets its own key and the default branch keeps its baseline', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->switchTo('feature-x', new: true);
+    $project->pest('--tia');
+
+    $delta = $project->delta();
+
+    expect($project->branchKeys())->toBe(['master', 'feature-x'])
+        ->and($delta->baselineUntouched('master'))->toBeTrue($delta->summary())
+        ->and($delta->writtenCount())->toBe(0, $delta->summary());
+})->skipOnWindows();
+
+test('the fallback reaches parallel workers', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->switchTo('feature-x', new: true);
+
+    $result = $project->pest('--tia', '--parallel', '--processes=2');
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($result->uncached())->toBe(0, $result->describe());
+})->skipOnWindows();

tests/Features/Tia/FilteredMode.php

@@ -0,0 +1,87 @@
+<?php
+
+declare(strict_types=1);
+
+use Tests\Fixtures\Tia\Project;
+
+afterEach(function (): void {
+    Project::destroyAll();
+});
+
+test('re-runs a cached failure on a clean tree', function (): void {
+    $project = Project::make('master');
+    $project->seed('master', failing: ['adds two numbers']);
+
+    $result = $project->pest('--tia', '--filtered');
+    $delta = $project->delta();
+
+    expect($result->output)->toContain('from 1 previously unsuccessful test')
+        ->and($result->affected())->toBe(2, $result->describe())
+        ->and($result->tally())->toContain('2 passed')
+        ->and($delta->writtenCount())->toBe(2, $delta->summary())
+        ->and($delta->isResultsOnly())->toBeTrue($delta->summary());
+})->skipOnWindows();
+
+test('an explicit path turns filtered mode off', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $result = $project->pest('--tia', '--filtered', 'tests/Unit');
+    $delta = $project->delta();
+
+    expect($result->output)->toContain('TIA does not apply to partial runs')
+        ->and($result->output)->not->toContain('No affected tests found')
+        ->and($result->tally())->toContain('4 passed')
+        ->and($delta->writtenCount())->toBe(4, $delta->summary())
+        ->and($delta->isResultsOnly())->toBeTrue($delta->summary());
+})->skipOnWindows();
+
+test('filtered mode runs the whole suite when there is no baseline', function (): void {
+    $project = Project::make('master');
+
+    $result = $project->pest('--tia', '--filtered');
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->tally())->toContain(Project::TOTAL_TESTS.' passed')
+        ->and($result->output)->not->toContain('No affected tests found');
+})->skipOnWindows();
+
+test('filtered mode finds nothing to do in parallel either', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $result = $project->pest('--tia', '--filtered', '--parallel', '--processes=2');
+    $delta = $project->delta();
+
+    expect($result->output)->toContain('No affected tests found')
+        ->and($result->exitCode)->toBe(0, $result->describe())
+        ->and($delta->isHardSuppressed())->toBeTrue($delta->summary());
+})->skipOnWindows();
+
+test('a corrupt graph is reported and does not crash the run', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $graph = $project->graphDir().'/graph.json';
+
+    file_put_contents($graph, '{not json');
+
+    $result = $project->pest('--tia');
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->tally())->toContain(Project::TOTAL_TESTS.' passed')
+        ->and($result->output)->toContain('The dependency graph could not be read')
+        ->and(is_file($graph) ? file_get_contents($graph) : null)->not->toBe('{not json');
+})->skipOnWindows();
+
+test('--parallel --retry is refused and leaves the graph alone', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $result = $project->pest('--parallel', '--retry');
+    $delta = $project->delta();
+
+    expect($result->exitCode)->not->toBe(0)
+        ->and($result->output)->toContain('--retry')
+        ->and($delta->isHardSuppressed())->toBeTrue($delta->summary());
+})->skipOnWindows();

tests/Features/Tia/HostileState.php

@@ -0,0 +1,221 @@
+<?php
+
+declare(strict_types=1);
+
+use Tests\Fixtures\Tia\Project;
+
+afterEach(function (): void {
+    Project::destroyAll();
+});
+
+test('a graph mangled beyond use still lets the suite run', function (string $contents): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    file_put_contents($project->graphDir().'/graph.json', $contents);
+
+    $result = $project->pest('--tia');
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->tally())->toContain(Project::TOTAL_TESTS.' passed');
+})->with([
+    'empty' => '',
+    'truncated' => '{"schema":1,"files":["app/Calculator.php"],"edg',
+    'not json' => '{not json',
+    'json scalar' => '"just a string"',
+    'json list' => '[1,2,3]',
+    'json null' => 'null',
+    'empty object' => '{}',
+    'nul bytes' => "\0\0\0\0",
+])->skipOnWindows();
+
+test('a graph whose shape is wrong everywhere is repaired rather than trusted', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->mutateGraph(function (array $graph): array {
+        $id = Project::testId('tests/Unit/CalculatorTest.php', 'adds two numbers');
+
+        $graph['baselines']['master']['results'][$id] = 'nope';
+        $graph['baselines']['master']['results'][7] = ['status' => 0, 'message' => '', 'time' => 0.1];
+        $graph['baselines']['master']['tree'] = 'nope';
+        $graph['baselines']['master']['sha'] = 42;
+        $graph['baselines'][''] = ['sha' => null, 'tree' => [], 'results' => []];
+        $graph['baselines']['broken'] = 'nope';
+        $graph['edges']['tests/Unit/GreeterTest.php'] = 'nope';
+        $graph['edges'][''] = [0];
+        $graph['files'][] = ['nested'];
+
+        return $graph;
+    });
+
+    $result = $project->pest('--tia', ...$arguments);
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->output)->not->toContain('TypeError')
+        ->and($result->tally())->toContain(Project::TOTAL_TESTS.' passed')
+        ->and($project->branchKeys())->toBe(['master']);
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->skipOnWindows();
+
+test('a cached status this build cannot interpret is re-run, not replayed', function (int $status): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->mutateGraph(function (array $graph) use ($status): array {
+        $id = Project::testId('tests/Unit/CalculatorTest.php', 'adds two numbers');
+        $graph['baselines']['master']['results'][$id]['status'] = $status;
+
+        return $graph;
+    });
+
+    $result = $project->pest('--tia');
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->tally())->toContain(Project::TOTAL_TESTS.' passed')
+        ->and($result->uncached())->toBe(1, $result->describe());
+})->with([
+    'below the range' => -1,
+    'one past the range' => 9,
+    'far past the range' => 99,
+    'huge' => PHP_INT_MAX,
+])->skipOnWindows();
+
+test('a cached status with no replay of its own does not fail the run', function (int $status): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->mutateGraph(function (array $graph) use ($status): array {
+        $id = Project::testId('tests/Unit/CalculatorTest.php', 'adds two numbers');
+        $graph['baselines']['master']['results'][$id]['status'] = $status;
+        $graph['baselines']['master']['results'][$id]['message'] = 'cached detail';
+
+        return $graph;
+    });
+
+    $result = $project->pest('--tia');
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->tally())->toContain(Project::TOTAL_TESTS.' passed');
+})->with(['notice' => 3, 'deprecation' => 4, 'warning' => 6])->skipOnWindows();
+
+test('a cached skip or todo replays with its message intact', function (int $status, string $tally): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->mutateGraph(function (array $graph) use ($status): array {
+        $id = Project::testId('tests/Unit/CalculatorTest.php', 'adds two numbers');
+        $graph['baselines']['master']['results'][$id]['status'] = $status;
+        $graph['baselines']['master']['results'][$id]['message'] = 'a recorded reason';
+
+        return $graph;
+    });
+
+    $result = $project->pest('--tia');
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->tally())->toContain($tally)
+        ->and($result->output)->toContain('a recorded reason')
+        ->and($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe());
+})->with([
+    'skipped' => [1, '1 skipped'],
+    'incomplete' => [2, '1 incomplete'],
+])->skipOnWindows();
+
+test('a cached failure with a multi-line message re-runs rather than replaying the text', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->mutateGraph(function (array $graph): array {
+        $id = Project::testId('tests/Unit/CalculatorTest.php', 'adds two numbers');
+        $graph['baselines']['master']['results'][$id]['status'] = 7;
+        $graph['baselines']['master']['results'][$id]['message'] = "line one\nline two\nline three";
+
+        return $graph;
+    });
+
+    $result = $project->pest('--tia');
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->uncached())->toBe(1, $result->describe())
+        ->and($result->tally())->toContain(Project::TOTAL_TESTS.' passed');
+})->skipOnWindows();
+
+test('a result pointing outside the project is not addressable and widens the run', function (): void {
+    $project = Project::make('master');
+    $project->seed('master', failing: ['adds two numbers']);
+
+    $project->mutateGraph(function (array $graph): array {
+        $id = Project::testId('tests/Unit/CalculatorTest.php', 'adds two numbers');
+        $graph['baselines']['master']['results'][$id]['file'] = '/build/agent/tests/Unit/CalculatorTest.php';
+
+        return $graph;
+    });
+
+    $result = $project->pest('--tia', '--filtered');
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->output)->toContain('could not be located on disk')
+        ->and($result->tally())->toContain(Project::TOTAL_TESTS.' passed');
+})->skipOnWindows();
+
+test('an edge pointing at a file id that does not exist is ignored', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->mutateGraph(function (array $graph): array {
+        $graph['edges']['tests/Unit/CalculatorTest.php'] = [0, 999, -5];
+
+        return $graph;
+    });
+
+    $result = $project->pest('--tia');
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe());
+})->skipOnWindows();
+
+test('a graph from a schema this build does not know is rebuilt, not read', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->mutateGraph(function (array $graph): array {
+        $graph['schema'] = 2;
+
+        return $graph;
+    });
+
+    $result = $project->pest('--tia');
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->tally())->toContain(Project::TOTAL_TESTS.' passed')
+        ->and($result->replayed())->toBe(0, $result->describe());
+})->skipOnWindows();
+
+test('graph.json being a directory does not stop the run', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    unlink($project->graphDir().'/graph.json');
+    mkdir($project->graphDir().'/graph.json');
+
+    $result = $project->pest('--tia');
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->tally())->toContain(Project::TOTAL_TESTS.' passed');
+})->skipOnWindows();
+
+test('a state dir it cannot write to still replays', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    chmod($project->graphDir(), 0500);
+
+    try {
+        $result = $project->pest('--tia');
+    } finally {
+        chmod($project->graphDir(), 0700);
+    }
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe());
+})->skipOnWindows();

tests/Features/Tia/IssueStatuses.php

@@ -0,0 +1,136 @@
+<?php
+
+declare(strict_types=1);
+
+use Tests\Fixtures\Tia\Project;
+
+afterEach(function (): void {
+    Project::destroyAll();
+});
+
+function tiaTriggering(string $call): string
+{
+    return <<<PHP
+    <?php
+
+    declare(strict_types=1);
+
+    use Fixture\App\Calculator;
+
+    test('adds two numbers', function (): void {
+        {$call}
+        expect((new Calculator)->add(1, 2))->toBe(3);
+    });
+
+    test('subtracts two numbers', function (): void {
+        expect((new Calculator)->subtract(3, 1))->toBe(2);
+    });
+    PHP;
+}
+
+test('a triggered issue is recorded as itself, not as a pass', function (array $arguments, string $call, int $status): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->write('tests/Unit/CalculatorTest.php', tiaTriggering($call));
+    $project->git()->commit('trigger an issue');
+
+    $project->pest('--tia', ...$arguments);
+
+    $id = Project::testId('tests/Unit/CalculatorTest.php', 'adds two numbers');
+
+    expect($project->graph()['baselines']['master']['results'][$id]['status'])->toBe($status);
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->with([
+    'deprecation' => ["trigger_error('legacy adder', E_USER_DEPRECATED);", 4],
+    'notice' => ["trigger_error('a notice', E_USER_NOTICE);", 3],
+    'warning' => ["trigger_error('a warning', E_USER_WARNING);", 6],
+])->skipOnWindows();
+
+test('a cached deprecation still fails the run that asked to fail on one', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->write('tests/Unit/CalculatorTest.php', tiaTriggering("trigger_error('legacy adder', E_USER_DEPRECATED);"));
+    $project->git()->commit('trigger a deprecation');
+
+    $project->pest('--tia', ...$arguments);
+
+    $result = $project->pest('--tia', '--fail-on-deprecation', ...$arguments);
+
+    expect($result->exitCode)->toBe(1, $result->describe())
+        ->and($result->tally())->toContain('1 deprecated')
+        ->and($result->uncached())->toBe(1, $result->describe());
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->skipOnWindows();
+
+test('replaying a cached issue does not downgrade it to a pass', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->write('tests/Unit/CalculatorTest.php', tiaTriggering("trigger_error('legacy adder', E_USER_DEPRECATED);"));
+    $project->git()->commit('trigger a deprecation');
+
+    $project->pest('--tia', ...$arguments);
+
+    $id = Project::testId('tests/Unit/CalculatorTest.php', 'adds two numbers');
+
+    foreach (range(1, 3) as $ignored) {
+        $project->pest('--tia', ...$arguments);
+
+        expect($project->graph()['baselines']['master']['results'][$id]['status'])->toBe(4);
+    }
+
+    $result = $project->pest('--tia', '--fail-on-deprecation', ...$arguments);
+
+    expect($result->exitCode)->toBe(1, $result->describe());
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->skipOnWindows();
+
+test('a failure outranks an issue triggered on the way to it', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->write('tests/Unit/CalculatorTest.php', str_replace(
+        'toBe(3)',
+        'toBe(999)',
+        tiaTriggering("trigger_error('legacy adder', E_USER_DEPRECATED);"),
+    ));
+    $project->git()->commit('an issue then a failure');
+
+    $result = $project->pest('--tia');
+
+    $id = Project::testId('tests/Unit/CalculatorTest.php', 'adds two numbers');
+
+    expect($result->exitCode)->not->toBe(0)
+        ->and($project->graph()['baselines']['master']['results'][$id]['status'])->toBe(7);
+})->skipOnWindows();
+
+test('a skip outranks an issue triggered on the way to it', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->write('tests/Unit/CalculatorTest.php', str_replace(
+        'expect((new Calculator)->add(1, 2))->toBe(3);',
+        "\$this->markTestSkipped('not today');",
+        tiaTriggering("trigger_error('legacy adder', E_USER_DEPRECATED);"),
+    ));
+    $project->git()->commit('an issue then a skip');
+
+    $project->pest('--tia');
+
+    $id = Project::testId('tests/Unit/CalculatorTest.php', 'adds two numbers');
+
+    expect($project->graph()['baselines']['master']['results'][$id]['status'])->toBe(1);
+})->skipOnWindows();
+
+test('a suppressed issue is not recorded', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->write('tests/Unit/CalculatorTest.php', tiaTriggering("@trigger_error('quiet', E_USER_DEPRECATED);"));
+    $project->git()->commit('a suppressed deprecation');
+
+    $project->pest('--tia');
+
+    $id = Project::testId('tests/Unit/CalculatorTest.php', 'adds two numbers');
+
+    expect($project->graph()['baselines']['master']['results'][$id]['status'])->toBe(0);
+})->skipOnWindows();

tests/Features/Tia/PartialRunWriteTier.php

@@ -0,0 +1,170 @@
+<?php
+
+declare(strict_types=1);
+
+use Tests\Fixtures\Tia\Project;
+
+afterEach(function (): void {
+    Project::destroyAll();
+});
+
+test('a filtered run rewrites only the test that ran', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $result = $project->pest('--filter=adds two numbers');
+    $delta = $project->delta();
+
+    expect($result->tally())->toContain('1 passed')
+        ->and($result->output)->not->toContain('TIA does not apply to partial runs')
+        ->and($delta->writtenCount())->toBe(1, $delta->summary())
+        ->and($delta->isResultsOnly())->toBeTrue($delta->summary());
+})->skipOnWindows();
+
+test('a filtered run under --tia announces that tia does not apply', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $result = $project->pest('--tia', '--filter=adds two numbers');
+    $delta = $project->delta();
+
+    expect($result->output)->toContain('TIA does not apply to partial runs')
+        ->and($delta->writtenCount())->toBe(1, $delta->summary())
+        ->and($delta->isResultsOnly())->toBeTrue($delta->summary());
+})->skipOnWindows();
+
+test('a test suffix narrows the tier even though every test runs', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $result = $project->pest('--tia', '--test-suffix=Test.php');
+    $delta = $project->delta();
+
+    expect($result->output)->toContain('TIA does not apply to partial runs')
+        ->and($result->tally())->toContain(Project::TOTAL_TESTS.' passed')
+        ->and($delta->writtenCount())->toBe(Project::TOTAL_TESTS, $delta->summary())
+        ->and($delta->isResultsOnly())->toBeTrue($delta->summary());
+})->skipOnWindows();
+
+test('a dirty run narrows to the uncommitted test edit', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->write('tests/Unit/GreeterTest.php', <<<'PHP'
+        <?php
+
+        declare(strict_types=1);
+
+        use Fixture\App\Greeter;
+
+        test('greets a person', function (): void {
+            expect((new Greeter)->greet('Nuno'))->toBe('Hello, Nuno!');
+        });
+
+        test('greets the world', function (): void {
+            expect((new Greeter)->greet('world'))->toBe('Hello, world!');
+        });
+
+        test('greets again', function (): void {
+            expect((new Greeter)->greet('again'))->toBe('Hello, again!');
+        });
+        PHP);
+
+    $result = $project->pest('--tia', '--dirty');
+    $delta = $project->delta();
+
+    expect($result->output)->toContain('TIA does not apply to partial runs')
+        ->and($result->tally())->toContain('3 passed')
+        ->and($delta->removed())->toBe(0, $delta->summary())
+        ->and($delta->structureMoved())->toBeFalse($delta->summary());
+})->skipOnWindows();
+
+test('filtered mode yields to an explicit filter', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $result = $project->pest('--tia', '--filtered', '--filter=adds two numbers');
+    $delta = $project->delta();
+
+    expect($result->output)->toContain('TIA does not apply to partial runs')
+        ->and($result->tally())->toContain('1 passed')
+        ->and($delta->writtenCount())->toBe(1, $delta->summary())
+        ->and($delta->isResultsOnly())->toBeTrue($delta->summary());
+})->skipOnWindows();
+
+test('an env flag narrows exactly like the option it mirrors', function (string $variable): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $result = $project->pestWithEnvironment($project->path(), [
+        $variable => '1',
+    ], '--filter=adds two numbers');
+
+    $delta = $project->delta();
+
+    expect($result->output)->toContain('TIA does not apply to partial runs')
+        ->and($delta->writtenCount())->toBe(1, $delta->summary())
+        ->and($delta->isResultsOnly())->toBeTrue($delta->summary());
+})->with(['PEST_TIA', 'PEST_TIA_FILTERED'])->skipOnWindows();
+
+test('a partial run does not purge the graph even with --fresh', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $result = $project->pest('--tia', '--fresh', '--filter=adds two numbers');
+    $delta = $project->delta();
+
+    expect($result->output)->toContain('TIA does not apply to partial runs')
+        ->and($delta->writtenCount())->toBe(1, $delta->summary())
+        ->and($delta->isResultsOnly())->toBeTrue($delta->summary());
+})->skipOnWindows();
+
+test('--no-tia does not stop a partial run from refreshing its own entry', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $result = $project->pest('--no-tia', '--filter=adds two numbers');
+    $delta = $project->delta();
+
+    expect($result->output)->not->toContain('TIA does not apply to partial runs')
+        ->and($delta->writtenCount())->toBe(1, $delta->summary())
+        ->and($delta->isResultsOnly())->toBeTrue($delta->summary());
+})->skipOnWindows();
+
+test('two partial runs each keep the other entry', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->pest('--filter=adds two numbers');
+    $project->pest('--filter=greets a person');
+
+    $delta = $project->delta();
+
+    expect($delta->writtenCount())->toBe(2, $delta->summary())
+        ->and($delta->isResultsOnly())->toBeTrue($delta->summary());
+})->skipOnWindows();
+
+test('a shard is a partial run', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $result = $project->pest('--tia', '--shard=1/2');
+    $delta = $project->delta();
+
+    expect($result->output)->toContain('TIA does not apply to partial runs')
+        ->and($delta->removed())->toBe(0, $delta->summary())
+        ->and($delta->isResultsOnly())->toBeTrue($delta->summary());
+})->skipOnWindows();
+
+test('a parallel partial run records the test that ran, like a sequential one', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $result = $project->pest('--tia', '--parallel', '--processes=2', '--filter=adds two numbers');
+    $delta = $project->delta();
+
+    expect($result->output)->toContain('TIA does not apply to partial runs')
+        ->and($result->tally())->toContain('1 passed')
+        ->and($delta->writtenCount())->toBe(1, $delta->summary())
+        ->and($delta->isResultsOnly())->toBeTrue($delta->summary());
+})->skipOnWindows();

tests/Features/Tia/RemoteBaseline.php

@@ -0,0 +1,141 @@
+<?php
+
+declare(strict_types=1);
+
+use Tests\Fixtures\Tia\Project;
+
+afterEach(function (): void {
+    Project::destroyAll();
+});
+
+/**
+ * @param  callable(array<string, mixed>): array<string, mixed>|null  $mutator
+ * @return array{0: Project, 1: array<string, string>}
+ */
+function tiaPublishedBaseline(string $mode = 'ok', ?callable $mutator = null): array
+{
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $payload = $project->detachGraph();
+
+    if ($mutator !== null) {
+        /** @var array<string, mixed> $decoded */
+        $decoded = json_decode($payload, true);
+        $payload = (string) json_encode($mutator($decoded), JSON_UNESCAPED_SLASHES);
+    }
+
+    return [$project, $project->gh($mode, $payload)];
+}
+
+test('a published baseline is fetched instead of recorded locally', function (): void {
+    [$project, $environment] = tiaPublishedBaseline();
+
+    $result = $project->pestWithEnvironment($project->path(), $environment, '--tia', '--baselined');
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->output)->toContain('Downloading TIA baseline')
+        ->and($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($project->graphExists())->toBeTrue();
+})->skipOnWindows();
+
+test('a fetched baseline that will not decode is discarded rather than trusted', function (): void {
+    [$project, $environment] = tiaPublishedBaseline('corrupt');
+
+    $result = $project->pestWithEnvironment($project->path(), $environment, '--tia', '--baselined');
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->output)->toContain('The dependency graph could not be read')
+        ->and($result->tally())->toContain(Project::TOTAL_TESTS.' passed')
+        ->and($result->replayed())->toBe(0, $result->describe());
+})->skipOnWindows();
+
+test('a fetched baseline recorded against another tree is not used', function (): void {
+    [$project, $environment] = tiaPublishedBaseline('ok', function (array $graph): array {
+        $graph['fingerprint']['structural']['composer_lock'] = 'a-lockfile-this-project-never-had';
+
+        return $graph;
+    });
+
+    $result = $project->pestWithEnvironment($project->path(), $environment, '--tia', '--baselined');
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->tally())->toContain(Project::TOTAL_TESTS.' passed')
+        ->and($result->replayed())->toBe(0, $result->describe());
+})->skipOnWindows();
+
+test('an artifact without a graph in it fails loudly', function (): void {
+    [$project, $environment] = tiaPublishedBaseline('missing-asset');
+
+    $result = $project->pestWithEnvironment($project->path(), $environment, '--tia', '--baselined');
+
+    expect($result->exitCode)->toBe(1, $result->describe())
+        ->and($result->output)->toContain('the artifact is missing expected files')
+        ->and($project->graphExists())->toBeFalse();
+})->skipOnWindows();
+
+test('a baseline that cannot be authenticated for fails loudly', function (): void {
+    [$project, $environment] = tiaPublishedBaseline('unauthenticated');
+
+    $result = $project->pestWithEnvironment($project->path(), $environment, '--tia', '--baselined');
+
+    expect($result->exitCode)->toBe(1, $result->describe())
+        ->and($result->output)->toContain('is not authenticated')
+        ->and($project->graphExists())->toBeFalse();
+})->skipOnWindows();
+
+test('a workflow or artifact that is not there fails loudly', function (): void {
+    [$project, $environment] = tiaPublishedBaseline('list-404');
+
+    $result = $project->pestWithEnvironment($project->path(), $environment, '--tia', '--baselined');
+
+    expect($result->exitCode)->toBe(1, $result->describe())
+        ->and($result->output)->toContain('not found in repo')
+        ->and($project->graphExists())->toBeFalse();
+})->skipOnWindows();
+
+test('a network failure warns and lets the suite run', function (string $mode): void {
+    [$project, $environment] = tiaPublishedBaseline($mode);
+
+    $result = $project->pestWithEnvironment($project->path(), $environment, '--tia', '--baselined');
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->output)->toContain('network error')
+        ->and($result->tally())->toContain(Project::TOTAL_TESTS.' passed');
+})->with([
+    'querying the runs' => ['list-network'],
+    'downloading the artifact' => ['download-network'],
+])->skipOnWindows();
+
+test('no published baseline yet starts a cooldown, and a corrupt cooldown does not break the run', function (): void {
+    [$project, $environment] = tiaPublishedBaseline('no-runs');
+
+    $discardGraph = function () use ($project): void {
+        if ($project->graphExists()) {
+            $project->detachGraph();
+        }
+    };
+
+    $first = $project->pestWithEnvironment($project->path(), $environment, '--tia', '--baselined');
+
+    expect($first->exitCode)->toBe(0, $first->describe())
+        ->and($first->output)->toContain('No baseline published yet')
+        ->and($project->graphDir().DIRECTORY_SEPARATOR.'fetch-cooldown.json')->toBeFile();
+
+    $discardGraph();
+
+    $second = $project->pestWithEnvironment($project->path(), $environment, '--tia', '--baselined');
+
+    expect($second->exitCode)->toBe(0, $second->describe())
+        ->and($second->output)->toContain('next auto-retry in');
+
+    file_put_contents($project->graphDir().DIRECTORY_SEPARATOR.'fetch-cooldown.json', 'not json{');
+
+    $discardGraph();
+
+    $third = $project->pestWithEnvironment($project->path(), $environment, '--tia', '--baselined');
+
+    expect($third->exitCode)->toBe(0, $third->describe())
+        ->and($third->output)->toContain('No baseline published yet')
+        ->and($third->tally())->toContain(Project::TOTAL_TESTS.' passed');
+})->skipOnWindows();

tests/Features/Tia/SelectionPaths.php

@@ -0,0 +1,218 @@
+<?php
+
+declare(strict_types=1);
+
+use Tests\Fixtures\Tia\Project;
+
+afterEach(function (): void {
+    Project::destroyAll();
+});
+
+function tiaSeedWithView(Project $project, string $view): void
+{
+    $project->seed('master');
+
+    $project->mutateGraph(function (array $graph) use ($view): array {
+        $id = count($graph['files']);
+        $graph['files'][$id] = $view;
+        $graph['edges']['tests/Unit/GreeterTest.php'][] = $id;
+
+        return $graph;
+    });
+}
+
+/**
+ * @param  array<int, string>  $components
+ * @param  array<string, array<int, string>>  $jsFileToComponents
+ */
+function tiaSeedWithInertia(Project $project, array $components, array $jsFileToComponents = []): void
+{
+    $project->seed('master');
+
+    $project->mutateGraph(function (array $graph) use ($components, $jsFileToComponents): array {
+        $graph['test_inertia_components'] = ['tests/Unit/GreeterTest.php' => $components];
+        $graph['js_file_to_components'] = $jsFileToComponents;
+
+        return $graph;
+    });
+}
+
+test('a committed rename selects the tests that depended on the old path', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->write('resources/views/greeting.blade.php', "<p>Hello</p>\n");
+    $project->git()->commit('add view');
+
+    tiaSeedWithView($project, 'resources/views/greeting.blade.php');
+
+    $project->git()->run(['mv', 'resources/views/greeting.blade.php', 'resources/views/hello.blade.php']);
+    $project->git()->commit('move the view');
+    $project->snapshot();
+
+    $result = $project->pest('--tia', ...$arguments);
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->affected())->toBe(2, $result->describe())
+        ->and($result->replayed())->toBe(4, $result->describe());
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->skipOnWindows();
+
+test('an affected test file that is gone does not strand a filtered run', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->write('resources/views/page.blade.php', "<p>one</p>\n");
+    $project->git()->commit('add view');
+    $project->seed('master');
+
+    $project->mutateGraph(function (array $graph): array {
+        $id = count($graph['files']);
+        $graph['files'][$id] = 'resources/views/page.blade.php';
+        $graph['edges']['tests/Unit/GhostTest.php'] = [$id];
+
+        return $graph;
+    });
+
+    $project->write('resources/views/page.blade.php', "<p>two</p>\n");
+    $project->snapshot();
+
+    $result = $project->pest('--tia', '--filtered', ...$arguments);
+    $delta = $project->delta();
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->output)->toContain('No affected tests found')
+        ->and($result->output)->not->toContain('tests/Unit/GhostTest.php')
+        ->and($delta->isHardSuppressed())->toBeTrue($delta->summary());
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->skipOnWindows();
+
+test('a plain run reclaims the edge of a test file that is gone', function (): void {
+    $project = Project::make('master');
+    $project->write('resources/views/page.blade.php', "<p>one</p>\n");
+    $project->git()->commit('add view');
+    $project->seed('master');
+
+    $project->mutateGraph(function (array $graph): array {
+        $id = count($graph['files']);
+        $graph['files'][$id] = 'resources/views/page.blade.php';
+        $graph['edges']['tests/Unit/GhostTest.php'] = [$id];
+        $graph['baselines']['master']['results']['P\\Tests\\Unit\\GhostTest::ghostly'] = [
+            'status' => 0,
+            'message' => '',
+            'time' => 9.999,
+            'assertions' => 42,
+            'file' => 'tests/Unit/GhostTest.php',
+        ];
+
+        return $graph;
+    });
+
+    $project->write('resources/views/page.blade.php', "<p>two</p>\n");
+    $project->snapshot();
+
+    $result = $project->pest('--tia');
+    $delta = $project->delta();
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($delta->removed())->toBe(1, $delta->summary())
+        ->and($project->graph()['edges'])->not->toHaveKey('tests/Unit/GhostTest.php');
+})->skipOnWindows();
+
+test('a changed view selects the test that rendered it', function (): void {
+    $project = Project::make('master');
+    $project->write('resources/views/page.blade.php', "<p>one</p>\n");
+    $project->git()->commit('add view');
+
+    tiaSeedWithView($project, 'resources/views/page.blade.php');
+
+    $project->write('resources/views/page.blade.php', "<p>two</p>\n");
+    $project->snapshot();
+
+    $result = $project->pest('--tia');
+
+    expect($result->affected())->toBe(2, $result->describe())
+        ->and($result->replayed())->toBe(4, $result->describe());
+})->skipOnWindows();
+
+test('a changed partial selects the test that rendered its ancestor', function (array $views, string $changed): void {
+    $project = Project::make('master');
+
+    foreach ($views as $path => $contents) {
+        $project->write($path, $contents);
+    }
+
+    $project->git()->commit('add views');
+
+    tiaSeedWithView($project, 'resources/views/page.blade.php');
+
+    $project->write($changed, $views[$changed]."<span>edited</span>\n");
+    $project->snapshot();
+
+    $result = $project->pest('--tia');
+
+    expect($result->affected())->toBe(2, $result->describe())
+        ->and($result->replayed())->toBe(4, $result->describe());
+})->with([
+    'direct @include' => [[
+        'resources/views/page.blade.php' => "@include('partials.nav')\n",
+        'resources/views/partials/nav.blade.php' => "<nav>one</nav>\n",
+    ], 'resources/views/partials/nav.blade.php'],
+    'transitive @include' => [[
+        'resources/views/page.blade.php' => "@include('partials.wrapper')\n",
+        'resources/views/partials/wrapper.blade.php' => "@include('partials.nav')\n",
+        'resources/views/partials/nav.blade.php' => "<nav>one</nav>\n",
+    ], 'resources/views/partials/nav.blade.php'],
+    'x- component' => [[
+        'resources/views/page.blade.php' => "<x-card>hi</x-card>\n",
+        'resources/views/components/card.blade.php' => "<div>one</div>\n",
+    ], 'resources/views/components/card.blade.php'],
+    'include cycle' => [[
+        'resources/views/page.blade.php' => "@include('partials.a')\n",
+        'resources/views/partials/a.blade.php' => "@include('partials.b')\n",
+        'resources/views/partials/b.blade.php' => "@include('partials.a')\n",
+    ], 'resources/views/partials/b.blade.php'],
+])->skipOnWindows();
+
+test('a changed Inertia page selects the test that rendered its component', function (): void {
+    $project = Project::make('master');
+    $project->write('resources/js/Pages/Foo.vue', "<template>one</template>\n");
+    $project->git()->commit('add page');
+
+    tiaSeedWithInertia($project, ['Foo']);
+
+    $project->write('resources/js/Pages/Foo.vue', "<template>two</template>\n");
+    $project->snapshot();
+
+    $result = $project->pest('--tia');
+
+    expect($result->affected())->toBe(2, $result->describe())
+        ->and($result->replayed())->toBe(4, $result->describe());
+})->skipOnWindows();
+
+test('a changed shared JS module selects the tests of the pages that import it', function (): void {
+    $project = Project::make('master');
+    $project->write('resources/js/Pages/Foo.vue', "<template>one</template>\n");
+    $project->write('resources/js/Shared/Nav.vue', "<template>nav</template>\n");
+    $project->git()->commit('add pages');
+
+    tiaSeedWithInertia($project, ['Foo'], ['resources/js/Shared/Nav.vue' => ['Foo']]);
+
+    $project->write('resources/js/Shared/Nav.vue', "<template>nav two</template>\n");
+    $project->snapshot();
+
+    $result = $project->pest('--tia');
+
+    expect($result->affected())->toBe(2, $result->describe())
+        ->and($result->replayed())->toBe(4, $result->describe());
+})->skipOnWindows();
+
+test('a changed frontend runtime file selects every Inertia test', function (): void {
+    $project = Project::make('master');
+    $project->write('resources/js/app.js', "console.log(1)\n");
+    $project->git()->commit('add runtime');
+
+    tiaSeedWithInertia($project, ['Foo']);
+
+    $project->write('resources/js/app.js', "console.log(2)\n");
+    $project->snapshot();
+
+    $result = $project->pest('--tia');
+
+    expect($result->affected())->toBe(2, $result->describe())
+        ->and($result->replayed())->toBe(4, $result->describe());
+})->skipOnWindows();

tests/Features/Tia/StateReclamation.php

@@ -0,0 +1,360 @@
+<?php
+
+declare(strict_types=1);
+
+use Tests\Fixtures\Tia\Project;
+
+afterEach(function (): void {
+    Project::destroyAll();
+});
+
+test('a detached HEAD does not purge the graph on structural drift', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->detach();
+
+    $project->write('composer.lock', (string) json_encode([
+        'content-hash' => 'drifted',
+        'packages' => [],
+        'packages-dev' => [],
+    ]));
+
+    $result = $project->pest('--tia', ...$arguments);
+    $delta = $project->delta();
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($project->graphExists())->toBeTrue('the detached run deleted graph.json')
+        ->and($delta->isHardSuppressed())->toBeTrue($delta->summary());
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->skipOnWindows();
+
+test('a detached HEAD does not purge the graph with --fresh either', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->detach();
+
+    $result = $project->pest('--tia', '--fresh', ...$arguments);
+    $delta = $project->delta();
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($project->graphExists())->toBeTrue('the detached --fresh run deleted graph.json')
+        ->and($delta->isHardSuppressed())->toBeTrue($delta->summary());
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->skipOnWindows();
+
+test('a detached HEAD leaves an unreadable graph for a checkout that can rebuild it', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->detach();
+
+    file_put_contents($project->graphDir().'/graph.json', '{not json');
+
+    $result = $project->pest('--tia');
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->tally())->toContain(Project::TOTAL_TESTS.' passed')
+        ->and(file_get_contents($project->graphDir().'/graph.json'))->toBe('{not json');
+})->skipOnWindows();
+
+test('a cached failure whose test file was deleted stops widening later runs', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->seed('master', failing: ['adds two numbers']);
+
+    unlink($project->path('tests/Unit/CalculatorTest.php'));
+    $project->git()->commit('drop CalculatorTest');
+
+    $project->pest('--tia', '--filtered', ...$arguments);
+
+    $project->snapshot();
+    $second = $project->pest('--tia', '--filtered', ...$arguments);
+    $delta = $project->delta();
+
+    expect($second->output)->not->toContain('could not be located on disk')
+        ->and($second->output)->toContain('No affected tests found')
+        ->and($delta->isHardSuppressed())->toBeTrue($delta->summary());
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->skipOnWindows();
+
+test('a complete run reclaims the entry and the edge of a deleted test file', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->seed('master', failing: ['adds two numbers']);
+
+    unlink($project->path('tests/Unit/CalculatorTest.php'));
+    $project->git()->commit('drop CalculatorTest');
+
+    $project->pest('--tia', ...$arguments);
+
+    $graph = $project->graph();
+
+    expect($graph['edges'] ?? [])->not->toHaveKey('tests/Unit/CalculatorTest.php')
+        ->and(array_column($graph['baselines']['master']['results'] ?? [], 'file'))
+        ->not->toContain('tests/Unit/CalculatorTest.php');
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->skipOnWindows();
+
+test('a pruned result does not come back from the fallback', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->seed('master', failing: ['adds two numbers']);
+
+    $project->git()->switchTo('feature-x', new: true);
+
+    $project->write('tests/Unit/CalculatorTest.php', <<<'PHP'
+    <?php
+
+    declare(strict_types=1);
+
+    use Fixture\App\Calculator;
+
+    test('adds two numbers, renamed', function (): void {
+        expect((new Calculator)->add(1, 2))->toBe(3);
+    });
+
+    test('subtracts two numbers', function (): void {
+        expect((new Calculator)->subtract(3, 1))->toBe(2);
+    });
+    PHP);
+
+    $project->git()->commit('rename the test on the branch');
+
+    $project->pest('--tia', '--filtered', ...$arguments);
+
+    $second = $project->pest('--tia', '--filtered', ...$arguments);
+
+    expect($second->output)->not->toContain('previously unsuccessful')
+        ->and($second->output)->toContain('No affected tests found');
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->skipOnWindows();
+
+test('the fallback still reaches a branch that has never run a test file', function (): void {
+    $project = Project::make('master');
+    $project->seed('master', failing: ['adds two numbers']);
+
+    $project->git()->switchTo('feature-x', new: true);
+
+    $project->pest('--filter=greets a person');
+
+    $result = $project->pest('--tia', '--filtered');
+
+    expect($result->output)->toContain('previously unsuccessful')
+        ->and($result->affected())->toBe(2, $result->describe());
+})->skipOnWindows();
+
+test('a branch that git no longer knows loses its baseline', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->switchTo('feature-x', new: true);
+    $project->pest('--tia');
+
+    expect($project->branchKeys())->toBe(['master', 'feature-x']);
+
+    $project->git()->switchTo('master');
+    $project->git()->run(['branch', '-D', 'feature-x']);
+
+    $project->pest('--tia');
+
+    expect($project->branchKeys())->toBe(['master']);
+})->skipOnWindows();
+
+test('an unknown cached status is re-run rather than replayed as a failure', function (int $status): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->mutateGraph(function (array $graph) use ($status): array {
+        $id = Project::testId('tests/Unit/CalculatorTest.php', 'adds two numbers');
+        $graph['baselines']['master']['results'][$id]['status'] = $status;
+
+        return $graph;
+    });
+
+    $result = $project->pest('--tia');
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->tally())->toContain(Project::TOTAL_TESTS.' passed')
+        ->and($result->uncached())->toBe(1, $result->describe());
+})->with(['unknown' => -1, 'future' => 9, 'garbage' => 99])->skipOnWindows();
+
+test('a cached notice, deprecation or warning does not replay as a failure', function (int $status): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->mutateGraph(function (array $graph) use ($status): array {
+        $id = Project::testId('tests/Unit/CalculatorTest.php', 'adds two numbers');
+        $graph['baselines']['master']['results'][$id]['status'] = $status;
+        $graph['baselines']['master']['results'][$id]['message'] = 'cached detail';
+
+        return $graph;
+    });
+
+    $result = $project->pest('--tia');
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->tally())->toContain(Project::TOTAL_TESTS.' passed');
+})->with(['notice' => 3, 'deprecation' => 4, 'warning' => 6])->skipOnWindows();
+
+test('a malformed baseline entry cannot break the run', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->mutateGraph(function (array $graph): array {
+        $id = Project::testId('tests/Unit/CalculatorTest.php', 'adds two numbers');
+        $graph['baselines']['master']['results'][$id] = 'nope';
+        $graph['baselines']['master']['tree'] = 'nope';
+        $graph['edges']['tests/Unit/GreeterTest.php'] = 'nope';
+
+        return $graph;
+    });
+
+    $result = $project->pest('--tia', ...$arguments);
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($result->output)->not->toContain('TypeError')
+        ->and($result->tally())->toContain(Project::TOTAL_TESTS.' passed');
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->skipOnWindows();
+
+test('a run torn down mid-file does not prune the tests it never reached', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->write('tests/Unit/CalculatorTest.php', <<<'PHP'
+    <?php
+
+    declare(strict_types=1);
+
+    use Fixture\App\Calculator;
+
+    test('adds two numbers', function (): void {
+        expect((new Calculator)->add(1, 2))->toBe(3);
+    });
+
+    test('subtracts two numbers', function (): void {
+        exit(0);
+    });
+    PHP);
+
+    $project->git()->commit('a test that kills its own process');
+
+    $project->pest('--tia', ...$arguments);
+    $delta = $project->delta();
+
+    expect($delta->removed())->toBe(0, $delta->summary())
+        ->and($delta->shaMoved())->toBeFalse($delta->summary())
+        ->and($delta->structureMoved())->toBeFalse($delta->summary())
+        ->and(array_keys($project->graph()['baselines']['master']['results']))
+        ->toContain(Project::testId('tests/Unit/CalculatorTest.php', 'subtracts two numbers'));
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->skipOnWindows();
+
+test('a fatal error mid-file is a test error, not a truncation', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->write('tests/Unit/CalculatorTest.php', <<<'PHP'
+    <?php
+
+    declare(strict_types=1);
+
+    use Fixture\App\Calculator;
+
+    test('adds two numbers', function (): void {
+        expect((new Calculator)->add(1, 2))->toBe(3);
+    });
+
+    test('subtracts two numbers', function (): void {
+        undefined_function_here();
+    });
+    PHP);
+
+    $project->git()->commit('a test that fatals');
+
+    $result = $project->pest('--tia', ...$arguments);
+    $delta = $project->delta();
+
+    expect($result->exitCode)->not->toBe(0)
+        ->and($result->tally())->toContain('1 failed')
+        ->and($delta->removed())->toBe(0, $delta->summary())
+        ->and($delta->structureMoved())->toBeFalse($delta->summary());
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->skipOnWindows();
+
+test('a green complete run leaves the graph exactly as it found it', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $result = $project->pest('--tia', ...$arguments);
+    $delta = $project->delta();
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($delta->isHardSuppressed())->toBeTrue($delta->summary());
+})->with([
+    'bail' => [['--bail']],
+    'stop-on-failure' => [['--stop-on-failure']],
+    'compact' => [['--compact']],
+    'parallel bail' => [['--parallel', '--processes=2', '--bail']],
+    'parallel one process' => [['--parallel', '--processes=1']],
+    'parallel more processes than files' => [['--parallel', '--processes=8']],
+])->skipOnWindows();
+
+test('--tia --no-tia is a plain run that still refreshes what it executed', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $result = $project->pest('--tia', '--no-tia', ...$arguments);
+    $delta = $project->delta();
+
+    expect($result->replayed())->toBe(0, $result->describe())
+        ->and($result->tally())->toContain(Project::TOTAL_TESTS.' passed')
+        ->and($delta->writtenCount())->toBe(Project::TOTAL_TESTS, $delta->summary())
+        ->and($delta->isResultsOnly())->toBeTrue($delta->summary());
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->skipOnWindows();
+
+test('--fresh on a partial run neither purges nor prunes', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $result = $project->pest('--tia', '--fresh', '--filter=adds two numbers', ...$arguments);
+    $delta = $project->delta();
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($project->graphExists())->toBeTrue()
+        ->and($delta->writtenCount())->toBe(1, $delta->summary())
+        ->and($delta->isResultsOnly())->toBeTrue($delta->summary());
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->skipOnWindows();
+
+test('a second green run on a feature branch writes nothing at all', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->git()->switchTo('feature-x', new: true);
+    $project->pest('--tia', ...$arguments);
+
+    $project->snapshot();
+    $result = $project->pest('--tia', ...$arguments);
+    $delta = $project->delta();
+
+    expect($result->replayed())->toBe(Project::TOTAL_TESTS, $result->describe())
+        ->and($delta->isHardSuppressed())->toBeTrue($delta->summary());
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->skipOnWindows();
+
+test('a graph whose recorded commit is gone is re-anchored, not warned about forever', function (array $arguments): void {
+    $project = Project::make('master');
+    $project->git()->commit('second');
+    $project->seed('master');
+
+    $recordedSha = $project->graph()['baselines']['master']['sha'];
+
+    $project->git()->run(['reset', '--quiet', '--hard', 'HEAD~1']);
+    $project->snapshot();
+
+    $first = $project->pest('--tia', ...$arguments);
+
+    expect($first->exitCode)->toBe(0, $first->describe())
+        ->and($first->output)->toContain('no longer reachable')
+        ->and($first->tally())->toContain(Project::TOTAL_TESTS.' passed')
+        ->and($project->graph()['baselines']['master']['sha'])->not->toBe($recordedSha)
+        ->and($project->graph()['baselines']['master']['sha'])->toBe($project->git()->sha());
+
+    $project->snapshot();
+    $second = $project->pest('--tia', ...$arguments);
+    $delta = $project->delta();
+
+    expect($second->output)->not->toContain('no longer reachable')
+        ->and($second->replayed())->toBe(Project::TOTAL_TESTS, $second->describe())
+        ->and($delta->writtenCount())->toBe(0, $delta->summary());
+})->with(Project::SEQUENTIAL_AND_PARALLEL)->skipOnWindows();

tests/Fixtures/Suites/InvalidNames/2fa/login.test.php

@@ -0,0 +1,5 @@
+<?php
+
+// The folder name creates the namespace segment `2fa`, which starts with a number.
+
+it('never runs')->assertTrue(true);

tests/Fixtures/Suites/InvalidNames/ReservedKeyword/list.test.php

@@ -0,0 +1,5 @@
+<?php
+
+// The file name creates the class `list`, which is a PHP keyword.
+
+it('never runs')->assertTrue(true);

tests/Fixtures/Suites/InvalidNames/ReservedType/int.test.php

@@ -0,0 +1,5 @@
+<?php
+
+// The file name creates the class `int`, which is a name PHP reserves.
+
+it('never runs')->assertTrue(true);

tests/Fixtures/Suites/InvalidNames/StartsWithNumber/2fa.test.php

@@ -0,0 +1,5 @@
+<?php
+
+// The file name creates the class `2fa`, which starts with a number.
+
+it('never runs')->assertTrue(true);

tests/Fixtures/Suites/MultipleGroups/OneTest.php

@@ -0,0 +1,5 @@
+<?php
+
+it('belongs to group one', function () {
+    expect(true)->toBeTrue();
+})->group('one');

tests/Fixtures/Suites/MultipleGroups/ThreeTest.php

@@ -0,0 +1,5 @@
+<?php
+
+it('belongs to group three', function () {
+    expect(true)->toBeTrue();
+})->group('three');

tests/Fixtures/Suites/MultipleGroups/TwoTest.php

@@ -0,0 +1,5 @@
+<?php
+
+it('belongs to group two', function () {
+    expect(true)->toBeTrue();
+})->group('two');

tests/Fixtures/Suites/TiaReplayHooks.php

@@ -0,0 +1,24 @@
+<?php
+
+// Only ever run through `tests/Features/Tia.php`, against a seeded TIA graph.
+// Both hooks throw, so a replayed test that wrongly runs one fails the run.
+
+beforeEach(function (): void {
+    throw new RuntimeException('The beforeEach hook must not run for replayed tests.');
+});
+
+afterEach(function (): void {
+    throw new RuntimeException('The afterEach hook must not run for replayed tests.');
+});
+
+test('replayed pass', function (): void {
+    expect(true)->toBeTrue();
+});
+
+test('replayed skip', function (): void {
+    expect(true)->toBeTrue();
+});
+
+test('replayed incomplete', function (): void {
+    expect(true)->toBeTrue();
+});

tests/Fixtures/Suites/TiaReplayHooks.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Runs TiaReplayHooks.php as a suite of its own, so `tests/Features/Tia.php` can
+  replay it without narrowing the run to a path. TIA declines to replay a
+  narrowed run, and a single-file invocation is exactly that.
+-->
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.0/phpunit.xsd"
+         bootstrap="../../../vendor/autoload.php"
+         colors="true"
+>
+  <testsuites>
+    <testsuite name="default">
+      <file>TiaReplayHooks.php</file>
+    </testsuite>
+  </testsuites>
+</phpunit>

tests/Fixtures/Tia/GitRepo.php

@@ -0,0 +1,147 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Fixtures\Tia;
+
+use RuntimeException;
+use Symfony\Component\Process\Process;
+
+/**
+ * @internal
+ */
+final readonly class GitRepo
+{
+    /**
+     * @var array<string, string>
+     */
+    public const array ENV = [
+        'GIT_CONFIG_GLOBAL' => '/dev/null',
+        'GIT_CONFIG_SYSTEM' => '/dev/null',
+        'GIT_CONFIG_NOSYSTEM' => '1',
+        'GIT_AUTHOR_NAME' => 'Pest Fixture',
+        'GIT_AUTHOR_EMAIL' => 'fixture@pestphp.io',
+        'GIT_COMMITTER_NAME' => 'Pest Fixture',
+        'GIT_COMMITTER_EMAIL' => 'fixture@pestphp.io',
+    ];
+
+    public function __construct(public string $path) {}
+
+    public function init(string $branch = 'master'): void
+    {
+        $this->run(['init', '--quiet']);
+        $this->run(['checkout', '--quiet', '-b', $branch]);
+        $this->commit('Initial commit');
+    }
+
+    public function commit(string $message): void
+    {
+        $this->run(['add', '-A']);
+        $this->run(['commit', '--quiet', '--allow-empty', '-m', $message]);
+    }
+
+    public function switchTo(string $branch, bool $new = false): void
+    {
+        $this->run($new ? ['checkout', '--quiet', '-b', $branch] : ['checkout', '--quiet', $branch]);
+    }
+
+    public function rename(string $from, string $to): void
+    {
+        $this->run(['branch', '-m', $from, $to]);
+    }
+
+    public function detach(): void
+    {
+        $this->run(['checkout', '--quiet', '--detach']);
+    }
+
+    public function addOrigin(string $url = 'git@github.com:pestphp/tia-fixture.git'): void
+    {
+        $this->run(['remote', 'add', 'origin', $url]);
+    }
+
+    public function removeOrigin(): void
+    {
+        $this->run(['remote', 'remove', 'origin']);
+    }
+
+    public function setOriginHead(string $branch): void
+    {
+        $this->run(['update-ref', 'refs/remotes/origin/'.$branch, 'HEAD']);
+        $this->run(['symbolic-ref', 'refs/remotes/origin/HEAD', 'refs/remotes/origin/'.$branch]);
+    }
+
+    public function unsetOriginHead(): void
+    {
+        $this->run(['symbolic-ref', '--delete', 'refs/remotes/origin/HEAD']);
+    }
+
+    public function config(string $key, string $value): void
+    {
+        $this->run(['config', '--local', $key, $value]);
+    }
+
+    public function worktree(string $path, string $branch): string
+    {
+        $this->run(['worktree', 'add', '--quiet', '-b', $branch, $path]);
+
+        return $path;
+    }
+
+    public function sha(): string
+    {
+        return $this->output(['rev-parse', 'HEAD']);
+    }
+
+    public function currentBranch(): string
+    {
+        return $this->output(['rev-parse', '--abbrev-ref', 'HEAD']);
+    }
+
+    /**
+     * @return array<int, string>
+     */
+    public function branchNames(): array
+    {
+        $names = explode("\n", $this->output(['for-each-ref', '--format=%(refname:short)', 'refs/heads']));
+
+        return array_values(array_filter($names, fn (string $name): bool => $name !== ''));
+    }
+
+    /**
+     * @param  array<int, string>  $arguments
+     */
+    public function output(array $arguments): string
+    {
+        return trim($this->process($arguments, mustSucceed: true)->getOutput());
+    }
+
+    /**
+     * @param  array<int, string>  $arguments
+     */
+    public function run(array $arguments): void
+    {
+        $this->process($arguments, mustSucceed: true);
+    }
+
+    /**
+     * @param  array<int, string>  $arguments
+     */
+    private function process(array $arguments, bool $mustSucceed): Process
+    {
+        $process = new Process(['git', ...$arguments], $this->path, self::ENV);
+        $process->setTimeout(120.0);
+        $process->run();
+
+        if ($mustSucceed && ! $process->isSuccessful()) {
+            throw new RuntimeException(sprintf(
+                "git %s failed in [%s]:\n%s",
+                implode(' ', $arguments),
+                $this->path,
+                $process->getErrorOutput().$process->getOutput(),
+            ));
+        }
+
+        return $process;
+    }
+}

tests/Fixtures/Tia/GraphDelta.php

@@ -0,0 +1,293 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Fixtures\Tia;
+
+/**
+ * @internal
+ */
+final readonly class GraphDelta
+{
+    /**
+     * @param  array<string, mixed>|null  $before
+     * @param  array<string, mixed>|null  $after
+     */
+    public function __construct(
+        private ?array $before,
+        private ?array $after,
+    ) {}
+
+    public function graphWasCreated(): bool
+    {
+        return $this->before === null && $this->after !== null;
+    }
+
+    public function graphWasDeleted(): bool
+    {
+        return $this->before !== null && $this->after === null;
+    }
+
+    public function writtenCount(): int
+    {
+        $written = 0;
+
+        foreach ($this->branchKeys() as $branch) {
+            $before = $this->results($this->before, $branch);
+            $after = $this->results($this->after, $branch);
+
+            foreach ($before as $testId => $entry) {
+                if (! isset($after[$testId])) {
+                    continue;
+                }
+
+                foreach (['status', 'time', 'assertions', 'message'] as $field) {
+                    if (($entry[$field] ?? null) !== ($after[$testId][$field] ?? null)) {
+                        $written++;
+
+                        break;
+                    }
+                }
+            }
+        }
+
+        return $written;
+    }
+
+    public function added(): int
+    {
+        $added = 0;
+
+        foreach ($this->branchKeys() as $branch) {
+            $added += count(array_diff(
+                array_keys($this->results($this->after, $branch)),
+                array_keys($this->results($this->before, $branch)),
+            ));
+        }
+
+        return $added;
+    }
+
+    public function removed(): int
+    {
+        $removed = 0;
+
+        foreach ($this->branchKeys() as $branch) {
+            $removed += count(array_diff(
+                array_keys($this->results($this->before, $branch)),
+                array_keys($this->results($this->after, $branch)),
+            ));
+        }
+
+        return $removed;
+    }
+
+    /**
+     * @return array<int, string>
+     */
+    public function branchKeys(): array
+    {
+        return array_map(strval(...), array_keys($this->baselines($this->after)));
+    }
+
+    /**
+     * @return array<int, string>
+     */
+    public function branchKeysBefore(): array
+    {
+        return array_map(strval(...), array_keys($this->baselines($this->before)));
+    }
+
+    public function branchKeysMoved(): bool
+    {
+        return $this->branchKeysBefore() !== $this->branchKeys();
+    }
+
+    public function baselineUntouched(string $branch): bool
+    {
+        return ($this->baselines($this->before)[$branch] ?? null)
+            === ($this->baselines($this->after)[$branch] ?? null);
+    }
+
+    public function shaMoved(): bool
+    {
+        return array_any($this->branchKeys(), fn (string $branch) => $this->baselineField($branch, 'sha', $this->before) !== $this->baselineField($branch, 'sha', $this->after));
+    }
+
+    public function treeMoved(): bool
+    {
+        return array_any($this->branchKeys(), fn (string $branch) => $this->baselineField($branch, 'tree', $this->before) !== $this->baselineField($branch, 'tree', $this->after));
+    }
+
+    public function edgesMoved(): bool
+    {
+        return $this->edgeSets($this->before) !== $this->edgeSets($this->after);
+    }
+
+    public function filesMoved(): bool
+    {
+        return $this->section($this->before, 'files') !== $this->section($this->after, 'files');
+    }
+
+    public function fingerprintMoved(): bool
+    {
+        return $this->section($this->before, 'fingerprint') !== $this->section($this->after, 'fingerprint');
+    }
+
+    public function structureMoved(): bool
+    {
+        if ($this->edgesMoved()) {
+            return true;
+        }
+        if ($this->filesMoved()) {
+            return true;
+        }
+        if ($this->fingerprintMoved()) {
+            return true;
+        }
+
+        return $this->branchKeysMoved();
+    }
+
+    public function isHardSuppressed(): bool
+    {
+        return $this->before === $this->after;
+    }
+
+    public function isResultsOnly(): bool
+    {
+        return ! $this->graphWasCreated()
+            && ! $this->graphWasDeleted()
+            && ! $this->structureMoved()
+            && ! $this->shaMoved()
+            && ! $this->treeMoved()
+            && $this->removed() === 0
+            && $this->added() === 0;
+    }
+
+    public function summary(): string
+    {
+        if ($this->graphWasCreated()) {
+            return 'graph created';
+        }
+
+        if ($this->graphWasDeleted()) {
+            return 'graph deleted';
+        }
+
+        $moved = [];
+
+        foreach (['edges', 'files', 'fingerprint'] as $section) {
+            if ($this->{$section.'Moved'}()) {
+                $moved[] = $section;
+            }
+        }
+
+        if ($this->branchKeysMoved()) {
+            $moved[] = sprintf(
+                'branchkeys(%s->%s)',
+                implode('|', $this->branchKeysBefore()),
+                implode('|', $this->branchKeys()),
+            );
+        }
+
+        return sprintf(
+            'w=%d +%d -%d %s%s%s',
+            $this->writtenCount(),
+            $this->added(),
+            $this->removed(),
+            $moved === [] ? 'struct:ok' : 'STRUCT:'.implode(',', $moved),
+            $this->shaMoved() ? ' sha:changed' : '',
+            $this->treeMoved() ? ' tree:changed' : '',
+        );
+    }
+
+    /**
+     * @param  array<string, mixed>|null  $graph
+     * @return array<string, array<int, string>>
+     */
+    private function edgeSets(?array $graph): array
+    {
+        $files = $this->section($graph, 'files');
+        $sets = [];
+
+        foreach ($this->section($graph, 'edges') as $test => $ids) {
+            if (! is_string($test)) {
+                continue;
+            }
+            if (! is_array($ids)) {
+                continue;
+            }
+            $paths = array_map(
+                fn (mixed $id): string => is_int($id) && isset($files[$id]) && is_string($files[$id])
+                    ? $files[$id]
+                    : '?'.json_encode($id),
+                $ids,
+            );
+
+            sort($paths);
+            $sets[$test] = $paths;
+        }
+
+        ksort($sets);
+
+        return $sets;
+    }
+
+    /**
+     * @param  array<string, mixed>|null  $graph
+     * @return array<mixed>
+     */
+    private function section(?array $graph, string $key): array
+    {
+        $section = $graph[$key] ?? null;
+
+        return is_array($section) ? $section : [];
+    }
+
+    /**
+     * @param  array<string, mixed>|null  $graph
+     * @return array<string, mixed>
+     */
+    private function baselines(?array $graph): array
+    {
+        $baselines = [];
+
+        foreach ($this->section($graph, 'baselines') as $branch => $baseline) {
+            $baselines[(string) $branch] = $baseline;
+        }
+
+        return $baselines;
+    }
+
+    /**
+     * @param  array<string, mixed>|null  $graph
+     * @return array<string, array<string, mixed>>
+     */
+    private function results(?array $graph, string $branch): array
+    {
+        $results = $this->baselines($graph)[$branch]['results'] ?? null;
+
+        if (! is_array($results)) {
+            return [];
+        }
+
+        $entries = [];
+
+        foreach ($results as $testId => $entry) {
+            if (is_string($testId) && is_array($entry)) {
+                $entries[$testId] = $entry;
+            }
+        }
+
+        return $entries;
+    }
+
+    /**
+     * @param  array<string, mixed>|null  $graph
+     */
+    private function baselineField(string $branch, string $field, ?array $graph): mixed
+    {
+        return $this->baselines($graph)[$branch][$field] ?? null;
+    }
+}

tests/Fixtures/Tia/PestResult.php

@@ -0,0 +1,75 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Fixtures\Tia;
+
+/**
+ * @internal
+ */
+final readonly class PestResult
+{
+    public string $output;
+
+    /**
+     * @param  array<int, string>  $arguments
+     */
+    public function __construct(
+        public array $arguments,
+        string $output,
+        public int $exitCode,
+    ) {
+        $this->output = (string) preg_replace([
+            '#\x1b[[][^A-Za-z]*[A-Za-z]#',
+            '#\x1b\]8;[^\x1b\x07]*(?:\x1b\\\\|\x07)#',
+        ], '', $output);
+    }
+
+    public function replayed(): int
+    {
+        return $this->recapFragment('replayed');
+    }
+
+    public function uncached(): int
+    {
+        return $this->recapFragment('uncached');
+    }
+
+    public function affected(): int
+    {
+        return $this->recapFragment('affected');
+    }
+
+    public function tally(): string
+    {
+        if (preg_match('/^\s*Tests:\s+(.+)$/m', $this->output, $matches) !== 1) {
+            return '';
+        }
+
+        return trim($matches[1]);
+    }
+
+    public function contains(string $needle): bool
+    {
+        return str_contains($this->output, $needle);
+    }
+
+    public function describe(): string
+    {
+        return sprintf(
+            "pest %s exited %d:\n%s",
+            implode(' ', $this->arguments),
+            $this->exitCode,
+            $this->output,
+        );
+    }
+
+    private function recapFragment(string $label): int
+    {
+        if (preg_match('/(\d+) '.preg_quote($label, '/').'/', $this->tally(), $matches) !== 1) {
+            return 0;
+        }
+
+        return (int) $matches[1];
+    }
+}

tests/Fixtures/Tia/Project.php

@@ -0,0 +1,569 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Fixtures\Tia;
+
+use FilesystemIterator;
+use Pest\Plugins\Tia;
+use Pest\Plugins\Tia\ChangedFiles;
+use Pest\Plugins\Tia\FileState;
+use Pest\Plugins\Tia\Fingerprint;
+use Pest\Plugins\Tia\Graph;
+use Pest\Plugins\Tia\Storage;
+use Pest\Support\Str;
+use RecursiveDirectoryIterator;
+use RecursiveIteratorIterator;
+use RuntimeException;
+use Symfony\Component\Process\Process;
+
+/**
+ * @internal
+ */
+final class Project
+{
+    /**
+     * @var array<string, array<int, string>>
+     */
+    public const array EDGES = [
+        'tests/Unit/CalculatorTest.php' => ['app/Calculator.php'],
+        'tests/Unit/GreeterTest.php' => ['app/Greeter.php'],
+        'tests/Feature/CoversCalculatorTest.php' => ['app/Calculator.php'],
+    ];
+
+    /**
+     * @var array<string, array<int, string>>
+     */
+    public const array TESTS = [
+        'tests/Unit/CalculatorTest.php' => ['adds two numbers', 'subtracts two numbers'],
+        'tests/Unit/GreeterTest.php' => ['greets a person', 'greets the world'],
+        'tests/Feature/CoversCalculatorTest.php' => ['adds within a feature test', 'subtracts within a feature test'],
+    ];
+
+    public const int TOTAL_TESTS = 6;
+
+    /**
+     * @var array<string, array<int, array<int, string>>>
+     */
+    public const array SEQUENTIAL_AND_PARALLEL = [
+        'sequential' => [[]],
+        'parallel' => [['--parallel', '--processes=2']],
+    ];
+
+    /**
+     * @var array<int, self>
+     */
+    private static array $created = [];
+
+    private ?GitRepo $repo = null;
+
+    /**
+     * @var array<string, mixed>|null
+     */
+    private ?array $snapshot = null;
+
+    /**
+     * @var array<int, string>
+     */
+    private array $extraPaths = [];
+
+    private string $graphRoot;
+
+    private function __construct(public readonly string $path)
+    {
+        $this->graphRoot = $path;
+    }
+
+    public static function make(string $branch = 'master', ?string $overlay = null): self
+    {
+        $project = self::scaffold($overlay);
+
+        $project->git()->init($branch);
+        $project->git()->addOrigin();
+        $project->git()->setOriginHead($branch);
+
+        return $project;
+    }
+
+    public static function destroyAll(): void
+    {
+        while (self::$created !== []) {
+            array_pop(self::$created)->destroy();
+        }
+    }
+
+    public static function withoutGit(?string $overlay = null): self
+    {
+        return self::scaffold($overlay);
+    }
+
+    public function git(): GitRepo
+    {
+        return $this->repo ??= new GitRepo($this->path);
+    }
+
+    public function path(string $relative = ''): string
+    {
+        return $relative === '' ? $this->path : $this->path.DIRECTORY_SEPARATOR.$relative;
+    }
+
+    public function write(string $relative, string $contents): void
+    {
+        $path = $this->path($relative);
+        $directory = dirname($path);
+
+        if (! is_dir($directory) && ! @mkdir($directory, 0755, true) && ! is_dir($directory)) {
+            throw new RuntimeException(sprintf('Unable to create [%s].', $directory));
+        }
+
+        if (file_put_contents($path, $contents) === false) {
+            throw new RuntimeException(sprintf('Unable to write [%s].', $path));
+        }
+    }
+
+    public function nested(string $directory = 'nested'): string
+    {
+        $path = $this->path($directory);
+
+        if (! is_dir($path) && ! @mkdir($path, 0755, true) && ! is_dir($path)) {
+            throw new RuntimeException(sprintf('Unable to create [%s].', $path));
+        }
+
+        self::copy(__DIR__.'/app', $path);
+        $this->scaffoldVendor($path);
+
+        return $path;
+    }
+
+    public function worktree(string $branch): string
+    {
+        $path = $this->path.'-worktree-'.preg_replace('/[^a-z0-9]+/i', '-', $branch);
+
+        $this->git()->worktree($path, $branch);
+        $this->scaffoldVendor($path);
+        $this->extraPaths[] = $path;
+
+        return $path;
+    }
+
+    public function pest(string ...$arguments): PestResult
+    {
+        return $this->pestIn($this->path, ...$arguments);
+    }
+
+    public function pestIn(string $directory, string ...$arguments): PestResult
+    {
+        return $this->pestWithEnvironment($directory, [], ...$arguments);
+    }
+
+    /**
+     * @param  array<string, string>  $environment
+     */
+    public function pestWithEnvironment(string $directory, array $environment, string ...$arguments): PestResult
+    {
+        $process = new Process(
+            [PHP_BINARY, $directory.'/vendor/pestphp/pest/bin/pest', ...$arguments],
+            $directory,
+            [
+                ...GitRepo::ENV,
+                'COLLISION_PRINTER' => 'DefaultPrinter',
+                'COLLISION_IGNORE_DURATION' => 'true',
+                'PARATEST' => '0',
+                'PAO_DISABLE' => '1',
+                'XDEBUG_MODE' => 'coverage',
+                'HOME' => $this->home(),
+                'GITHUB_EVENT_PATH' => '',
+                'CI_DEFAULT_BRANCH' => '',
+                'GITHUB_ACTIONS' => '',
+                'GITLAB_CI' => '',
+                'CIRCLECI' => '',
+                ...$environment,
+            ],
+        );
+
+        $process->setTimeout(180.0);
+        $process->run();
+
+        return new PestResult(
+            array_values($arguments),
+            $process->getOutput().$process->getErrorOutput(),
+            (int) $process->getExitCode(),
+        );
+    }
+
+    /**
+     * @param  array<int, string>  $failing
+     */
+    public function seed(string $branch, bool $sentinel = true, array $failing = []): void
+    {
+        $this->seedFor($this->path, $branch, $sentinel, $failing);
+    }
+
+    /**
+     * @param  array<int, string>  $failing
+     */
+    public function seedFor(string $root, string $branch, bool $sentinel = true, array $failing = []): void
+    {
+        $this->graphRoot = $root;
+
+        $changedFiles = new ChangedFiles($root);
+        $sha = new GitRepo($root)->sha();
+
+        $graph = new Graph($root);
+        $graph->setFingerprint(Fingerprint::compute($root));
+        $graph->setRecordedAtSha($branch, $sha);
+
+        $graph->setLastRunTree($branch, $changedFiles->snapshotTree($changedFiles->since($sha) ?? []));
+
+        $graph->markKnownTestFiles(array_keys(self::EDGES));
+
+        foreach (self::EDGES as $testFile => $sourceFiles) {
+            $graph->link($testFile, $testFile);
+
+            foreach ($sourceFiles as $sourceFile) {
+                $graph->link($testFile, $sourceFile);
+            }
+        }
+
+        foreach (self::TESTS as $testFile => $descriptions) {
+            foreach ($descriptions as $description) {
+                $failed = in_array($description, $failing, true);
+
+                $graph->setResult(
+                    $branch,
+                    self::testId($testFile, $description),
+                    $failed ? 7 : 0,
+                    $failed ? 'cached failure' : '',
+                    0.05,
+                    1,
+                    $testFile,
+                );
+            }
+        }
+
+        $json = $graph->encode();
+
+        if ($json === null) {
+            throw new RuntimeException('Unable to encode the seeded graph.');
+        }
+
+        if (! $this->state()->write(Tia::KEY_GRAPH, $json)) {
+            throw new RuntimeException('Unable to persist the seeded graph.');
+        }
+
+        $sentinel ? $this->sentinel() : $this->snapshot();
+    }
+
+    public function detachGraph(): string
+    {
+        $json = $this->state()->read(Tia::KEY_GRAPH);
+
+        if ($json === null) {
+            throw new RuntimeException('There is no graph to detach.');
+        }
+
+        if (! $this->state()->delete(Tia::KEY_GRAPH)) {
+            throw new RuntimeException('Unable to remove the detached graph.');
+        }
+
+        $this->snapshot();
+
+        return $json;
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    public function gh(string $mode = 'ok', string $payload = '{}'): array
+    {
+        self::mirror(__DIR__.'/stubs/gh', $this->path('stub/gh'));
+        chmod($this->path('stub/gh'), 0755);
+
+        $this->write('payload/graph.json', $payload);
+
+        return [
+            'PATH' => $this->path('stub').PATH_SEPARATOR.getenv('PATH'),
+            'GH_STUB_MODE' => $mode,
+            'GH_STUB_PAYLOAD' => $this->path('payload/graph.json'),
+        ];
+    }
+
+    public static function testId(string $testFile, string $description): string
+    {
+        $basename = basename($testFile, '.php');
+        $dotPosition = strpos($basename, '.');
+
+        if ($dotPosition !== false) {
+            $basename = substr($basename, 0, $dotPosition);
+        }
+
+        $relative = dirname(ucfirst($testFile)).DIRECTORY_SEPARATOR.$basename;
+
+        return 'P\\'.str_replace(DIRECTORY_SEPARATOR, '\\', $relative).'::'.Str::evaluable($description);
+    }
+
+    public function sentinel(): void
+    {
+        $this->mutateGraph(function (array $graph): array {
+            foreach ($graph['baselines'] ?? [] as $branch => $baseline) {
+                foreach (array_keys($baseline['results'] ?? []) as $testId) {
+                    $graph['baselines'][$branch]['results'][$testId]['time'] = 9.999;
+
+                    if ((int) ($baseline['results'][$testId]['assertions'] ?? 0) > 0) {
+                        $graph['baselines'][$branch]['results'][$testId]['assertions'] = 42;
+                    }
+                }
+            }
+
+            return $graph;
+        });
+    }
+
+    public function addBaseline(string $branch): void
+    {
+        $this->mutateGraph(function (array $graph) use ($branch): array {
+            $graph['baselines'][$branch] = ['sha' => null, 'tree' => [], 'results' => []];
+
+            return $graph;
+        });
+    }
+
+    /**
+     * @param  callable(array<string, mixed>): array<string, mixed>  $callback
+     */
+    public function mutateGraph(callable $callback): void
+    {
+        $graph = $this->graph();
+
+        if ($graph === null) {
+            throw new RuntimeException('There is no graph to mutate.');
+        }
+
+        $this->state()->write(Tia::KEY_GRAPH, (string) json_encode($callback($graph), JSON_UNESCAPED_SLASHES));
+
+        $this->snapshot();
+    }
+
+    /**
+     * @return array<string, mixed>|null
+     */
+    public function graph(): ?array
+    {
+        $json = $this->state()->read(Tia::KEY_GRAPH);
+
+        if ($json === null) {
+            return null;
+        }
+
+        $graph = json_decode($json, true);
+
+        return is_array($graph) ? $graph : null;
+    }
+
+    /**
+     * @return array<int, string>
+     */
+    public function branchKeys(): array
+    {
+        $baselines = $this->graph()['baselines'] ?? [];
+
+        return is_array($baselines) ? array_map(strval(...), array_keys($baselines)) : [];
+    }
+
+    public function graphDir(): string
+    {
+        return $this->withHome(fn (): string => Storage::tempDir($this->graphRoot));
+    }
+
+    public function graphExists(): bool
+    {
+        return is_file($this->graphDir().DIRECTORY_SEPARATOR.Tia::KEY_GRAPH);
+    }
+
+    public function snapshot(): void
+    {
+        $this->snapshot = $this->graph();
+    }
+
+    public function delta(): GraphDelta
+    {
+        return new GraphDelta($this->snapshot, $this->graph());
+    }
+
+    public function scaffoldVendor(string $directory): void
+    {
+        $pestRoot = dirname(__DIR__, 3);
+        $pest = $directory.'/vendor/pestphp/pest';
+
+        foreach (['src', 'overrides', 'resources', 'stubs'] as $tree) {
+            self::mirror($pestRoot.'/'.$tree, $pest.'/'.$tree);
+        }
+
+        foreach (['pest', 'worker.php'] as $binary) {
+            self::mirror($pestRoot.'/bin/'.$binary, $pest.'/bin/'.$binary);
+        }
+
+        self::mirror($pestRoot.'/composer.json', $pest.'/composer.json');
+
+        file_put_contents($directory.'/vendor/autoload.php', sprintf(
+            "<?php\n\n\$loader = require %s;\n\$loader->addPsr4('Pest\\\\', __DIR__.'/pestphp/pest/src', true);\n\nreturn \$loader;\n",
+            var_export($pestRoot.'/vendor/autoload.php', true),
+        ));
+
+        if (! is_dir($directory.'/vendor/bin') && ! @mkdir($directory.'/vendor/bin', 0755, true)) {
+            throw new RuntimeException(sprintf('Unable to create [%s].', $directory.'/vendor/bin'));
+        }
+
+        self::mirror($pestRoot.'/vendor/pest-plugins.json', $directory.'/vendor/pest-plugins.json');
+    }
+
+    public function destroy(): void
+    {
+        foreach ([...$this->extraPaths, $this->path] as $path) {
+            $this->remove($path);
+        }
+    }
+
+    private function home(): string
+    {
+        return $this->path.DIRECTORY_SEPARATOR.'.home';
+    }
+
+    private function state(): FileState
+    {
+        return new FileState($this->graphDir());
+    }
+
+    /**
+     * @template TReturn
+     *
+     * @param  callable(): TReturn  $callback
+     * @return TReturn
+     */
+    private function withHome(callable $callback): mixed
+    {
+        $original = getenv('HOME');
+
+        putenv('HOME='.$this->home());
+
+        try {
+            return $callback();
+        } finally {
+            putenv($original === false ? 'HOME' : 'HOME='.$original);
+        }
+    }
+
+    private static function scaffold(?string $overlay): self
+    {
+        $path = sys_get_temp_dir().DIRECTORY_SEPARATOR.'pest-tia-'.bin2hex(random_bytes(8));
+
+        if (! @mkdir($path, 0755, true) && ! is_dir($path)) {
+            throw new RuntimeException(sprintf('Unable to create [%s].', $path));
+        }
+
+        $real = realpath($path);
+
+        $project = new self($real === false ? $path : $real);
+
+        self::$created[] = $project;
+
+        self::copy(__DIR__.'/app', $project->path);
+
+        if ($overlay !== null) {
+            self::copy(__DIR__.'/overlays/'.$overlay, $project->path);
+        }
+
+        $project->write('.gitignore', implode("\n", ['/vendor/', '/.home/', '/.phpunit.cache/', '']));
+
+        $project->scaffoldVendor($project->path);
+        @mkdir($project->home(), 0755, true);
+
+        return $project;
+    }
+
+    private static function mirror(string $from, string $to): void
+    {
+        if (is_dir($from)) {
+            foreach (self::contentsOf($from) as $path) {
+                self::mirror($path->getPathname(), $to.DIRECTORY_SEPARATOR.substr($path->getPathname(), strlen($from) + 1));
+            }
+
+            return;
+        }
+
+        $directory = dirname($to);
+
+        if (! is_dir($directory) && ! @mkdir($directory, 0755, true) && ! is_dir($directory)) {
+            throw new RuntimeException(sprintf('Unable to create [%s].', $directory));
+        }
+
+        if (@link($from, $to) || @copy($from, $to)) {
+            return;
+        }
+
+        throw new RuntimeException(sprintf('Unable to mirror [%s] into [%s].', $from, $to));
+    }
+
+    /**
+     * @return iterable<\SplFileInfo>
+     */
+    private static function contentsOf(string $directory): iterable
+    {
+        $paths = new RecursiveIteratorIterator(
+            new RecursiveDirectoryIterator($directory, FilesystemIterator::SKIP_DOTS),
+            RecursiveIteratorIterator::SELF_FIRST,
+        );
+
+        foreach ($paths as $path) {
+            if (! $path->isDir()) {
+                yield $path;
+            }
+        }
+    }
+
+    private static function copy(string $from, string $to): void
+    {
+        $paths = new RecursiveIteratorIterator(
+            new RecursiveDirectoryIterator($from, FilesystemIterator::SKIP_DOTS),
+            RecursiveIteratorIterator::SELF_FIRST,
+        );
+
+        foreach ($paths as $path) {
+            $target = $to.DIRECTORY_SEPARATOR.substr($path->getPathname(), strlen($from) + 1);
+
+            if ($path->isDir()) {
+                if (! is_dir($target) && ! @mkdir($target, 0755, true) && ! is_dir($target)) {
+                    throw new RuntimeException(sprintf('Unable to create [%s].', $target));
+                }
+
+                continue;
+            }
+
+            if (! is_dir(dirname($target)) && ! @mkdir(dirname($target), 0755, true) && ! is_dir(dirname($target))) {
+                throw new RuntimeException(sprintf('Unable to create [%s].', dirname($target)));
+            }
+
+            if (! @copy($path->getPathname(), $target)) {
+                throw new RuntimeException(sprintf('Unable to copy [%s].', $path->getPathname()));
+            }
+        }
+    }
+
+    private function remove(string $path): void
+    {
+        if (! is_dir($path)) {
+            return;
+        }
+
+        $paths = new RecursiveIteratorIterator(
+            new RecursiveDirectoryIterator($path, FilesystemIterator::SKIP_DOTS),
+            RecursiveIteratorIterator::CHILD_FIRST,
+        );
+
+        foreach ($paths as $entry) {
+            $entry->isDir() && ! $entry->isLink() ? @rmdir($entry->getPathname()) : @unlink($entry->getPathname());
+        }
+
+        @rmdir($path);
+    }
+}

tests/Fixtures/Tia/app/app/Calculator.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Fixture\App;
+
+final class Calculator
+{
+    public function add(int $a, int $b): int
+    {
+        return $a + $b;
+    }
+
+    public function subtract(int $a, int $b): int
+    {
+        return $a - $b;
+    }
+}