wip

.github/workflows/static.yml

@@ -11,6 +11,9 @@ concurrency:
   group: static-${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 jobs:
   static:
     if: github.event_name != 'schedule' || github.repository == 'pestphp/pest'
@@ -44,7 +47,7 @@ jobs:
       uses: actions/cache@v5
       with:
         path: ${{ steps.composer-cache.outputs.dir }}
-        key: static-php-8.3-${{ matrix.dependency-version }}-composer-${{ hashFiles('**/composer.json') }}
+        key: static-php-8.3-${{ matrix.dependency-version }}-composer-${{ hashFiles('**/composer.json', '**/composer.lock') }}
         restore-keys: |
           static-php-8.3-${{ matrix.dependency-version }}-composer-
           static-php-8.3-composer-

.github/workflows/tests.yml

@@ -11,6 +11,9 @@ concurrency:
   group: tests-${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 jobs:
   tests:
     if: github.event_name != 'schedule' || github.repository == 'pestphp/pest'
@@ -51,7 +54,7 @@ jobs:
       uses: actions/cache@v5
       with:
         path: ${{ steps.composer-cache.outputs.dir }}
-        key: ${{ matrix.os }}-php-${{ matrix.php }}-symfony-${{ matrix.symfony }}-composer-${{ hashFiles('**/composer.json') }}
+        key: ${{ matrix.os }}-php-${{ matrix.php }}-symfony-${{ matrix.symfony }}-composer-${{ hashFiles('**/composer.json', '**/composer.lock') }}
         restore-keys: |
           ${{ matrix.os }}-php-${{ matrix.php }}-symfony-${{ matrix.symfony }}-composer-
           ${{ matrix.os }}-php-${{ matrix.php }}-composer-

bin/pest

@@ -3,8 +3,10 @@
 
 declare(strict_types=1);
 
+use Pest\Contracts\Restarter;
 use Pest\Kernel;
 use Pest\Panic;
+use Pest\Support\Container;
 use Pest\TestCaseFilters\GitDirtyTestCaseFilter;
 use Pest\TestCaseMethodFilters\AssigneeTestCaseFilter;
 use Pest\TestCaseMethodFilters\IssueTestCaseFilter;
@@ -142,6 +144,7 @@ use Symfony\Component\Console\Output\ConsoleOutput;
 
     // Get $rootPath based on $autoloadPath
     $rootPath = dirname($autoloadPath, 2);
+
     $input = new ArgvInput;
 
     $testSuite = TestSuite::getInstance(
@@ -192,6 +195,15 @@ use Symfony\Component\Console\Output\ConsoleOutput;
     try {
         $kernel = Kernel::boot($testSuite, $input, $output);
 
+        $container = Container::getInstance();
+
+        foreach (Kernel::RESTARTERS as $restarterClass) {
+            $restarter = $container->get($restarterClass);
+            assert($restarter instanceof Restarter);
+
+            $restarter->maybeRestart($rootPath, $originalArguments);
+        }
+
         $result = $kernel->handle($originalArguments, $arguments);
 
         $kernel->terminate();

bin/pest-tia-vite-deps.mjs

@@ -0,0 +1,205 @@
+#!/usr/bin/env node
+
+import { readdir, readFile } from 'node:fs/promises'
+import { existsSync } from 'node:fs'
+import { createRequire } from 'node:module'
+import { resolve, relative, extname, sep, join } from 'node:path'
+import { pathToFileURL } from 'node:url'
+
+const PAGE_EXTENSIONS = new Set(['.vue', '.tsx', '.jsx', '.svelte'])
+const ASSET_EXT_RE = /\.(css|scss|sass|less|styl|stylus|svg|png|jpe?g|gif|webp|avif|ico|bmp|woff2?|ttf|eot|otf|md|mdx|txt|html|mp4|webm|mp3|wav|ogg|m4a|pdf|wasm|glsl|frag|vert)$/i
+const PROJECT_ROOT = resolve(process.argv[2] ?? process.cwd())
+const PAGES_REL = (process.env.TIA_VITE_PAGES_DIR ?? 'resources/js/Pages').replace(/\\/g, '/')
+
+async function loadRolldown() {
+  const projectRequire = createRequire(join(PROJECT_ROOT, 'package.json'))
+  const path = projectRequire.resolve('rolldown')
+  return await import(pathToFileURL(path).href)
+}
+
+async function readJsonWithComments(path) {
+  const raw = await readFile(path, 'utf8')
+  const stripped = raw
+    .replace(/\/\*[\s\S]*?\*\//g, '')
+    .replace(/(^|[^:])\/\/[^\n]*/g, '$1')
+  return JSON.parse(stripped)
+}
+
+async function loadAliasFromTsconfig() {
+  const alias = {}
+  for (const name of ['tsconfig.json', 'jsconfig.json']) {
+    const p = join(PROJECT_ROOT, name)
+    if (!existsSync(p)) continue
+    let cfg
+    try { cfg = await readJsonWithComments(p) } catch { continue }
+    const baseUrl = resolve(PROJECT_ROOT, cfg?.compilerOptions?.baseUrl ?? '.')
+    const paths = cfg?.compilerOptions?.paths ?? {}
+    for (const [key, targets] of Object.entries(paths)) {
+      if (!key.endsWith('/*')) continue
+      const t0 = Array.isArray(targets) ? targets[0] : null
+      if (typeof t0 !== 'string' || !t0.endsWith('/*')) continue
+      const aliasKey = key.slice(0, -2)
+      if (alias[aliasKey] !== undefined) continue
+      alias[aliasKey] = resolve(baseUrl, t0.slice(0, -2))
+    }
+  }
+  return alias
+}
+
+async function listPageFiles(pagesDir) {
+  if (!existsSync(pagesDir)) return []
+
+  const out = []
+  const walk = async (dir) => {
+    let entries
+    try { entries = await readdir(dir, { withFileTypes: true }) } catch { return }
+    for (const entry of entries) {
+      const full = resolve(dir, entry.name)
+      if (entry.isDirectory()) { await walk(full); continue }
+      if (PAGE_EXTENSIONS.has(extname(entry.name))) out.push(full)
+    }
+  }
+
+  await walk(pagesDir)
+  return out
+}
+
+function componentNameFor(pageAbs, pagesDir) {
+  const rel = relative(pagesDir, pageAbs).split(sep).join('/')
+  const ext = extname(rel)
+  return rel.slice(0, rel.length - ext.length)
+}
+
+function isLocalSpecifier(source, aliasKeys) {
+  if (source.startsWith('.') || source.startsWith('/')) return true
+  for (const key of aliasKeys) {
+    if (source === key || source.startsWith(key + '/')) return true
+  }
+  return false
+}
+
+async function main() {
+  const pagesDir = resolve(PROJECT_ROOT, PAGES_REL)
+  const pages = await listPageFiles(pagesDir)
+
+  if (pages.length === 0) {
+    process.stdout.write('{}')
+    return
+  }
+
+  const { rolldown } = await loadRolldown()
+  const alias = await loadAliasFromTsconfig()
+  const aliasKeys = Object.keys(alias)
+
+  const graph = new Map()
+
+  const collector = {
+    name: 'pest-tia-collector',
+    moduleParsed(info) {
+      const id = info.id
+      if (!id || id.startsWith('\0')) return
+      const deps = new Set()
+      for (const i of info.importedIds) if (i && !i.startsWith('\0')) deps.add(i)
+      for (const i of info.dynamicallyImportedIds) if (i && !i.startsWith('\0')) deps.add(i)
+      graph.set(id, deps)
+    },
+  }
+
+  const externalBare = {
+    name: 'pest-tia-external-bare',
+    resolveId(source) {
+      if (!source) return null
+      if (isLocalSpecifier(source, aliasKeys)) return null
+      return { id: source, external: true }
+    },
+  }
+
+  const assetStub = {
+    name: 'pest-tia-asset-stub',
+    load(id) {
+      if (!id) return null
+      if (ASSET_EXT_RE.test(id)) {
+        return { code: 'export default null', moduleSideEffects: false }
+      }
+      return null
+    },
+  }
+
+  const input = Object.create(null)
+  for (let i = 0; i < pages.length; i++) input[`p${i}`] = pages[i]
+
+  const bundle = await rolldown({
+    input,
+    cwd: PROJECT_ROOT,
+    resolve: {
+      alias,
+      extensions: ['.tsx', '.ts', '.jsx', '.js', '.mjs', '.cjs', '.json'],
+    },
+    transform: { jsx: 'preserve' },
+    treeshake: false,
+    plugins: [externalBare, assetStub, collector],
+    logLevel: 'silent',
+    onLog: () => {},
+  })
+
+  try {
+    await bundle.generate({ format: 'esm' })
+  } finally {
+    await bundle.close()
+  }
+
+  const reverse = new Map()
+  const transitiveCache = new Map()
+
+  const computeTransitive = (id, stack) => {
+    const cached = transitiveCache.get(id)
+    if (cached) return cached
+    if (stack.has(id)) return null
+
+    stack.add(id)
+    const acc = new Set()
+    const deps = graph.get(id)
+    if (deps) {
+      for (const dep of deps) {
+        if (!dep || dep.startsWith('\0')) continue
+        if (dep.startsWith(PROJECT_ROOT)) {
+          const rel = relative(PROJECT_ROOT, dep).split(sep).join('/')
+          acc.add(rel)
+        }
+        if (stack.has(dep)) continue
+        const child = computeTransitive(dep, stack)
+        if (child) for (const r of child) acc.add(r)
+      }
+    }
+    stack.delete(id)
+    transitiveCache.set(id, acc)
+    return acc
+  }
+
+  for (const page of pages) {
+    const pageComponent = componentNameFor(page, pagesDir)
+    const reachable = computeTransitive(page, new Set())
+    if (!reachable) continue
+    for (const rel of reachable) {
+      const bucket = reverse.get(rel) ?? new Set()
+      bucket.add(pageComponent)
+      reverse.set(rel, bucket)
+    }
+  }
+
+  const payload = Object.create(null)
+  const keys = [...reverse.keys()].sort()
+  for (const key of keys) {
+    payload[key] = [...reverse.get(key)].sort()
+  }
+
+  process.stdout.write(JSON.stringify(payload))
+}
+
+try {
+  void pathToFileURL
+  await main()
+} catch (err) {
+  process.stderr.write(String(err?.stack ?? err ?? 'unknown error'))
+  process.exit(1)
+}

composer.json

@@ -19,18 +19,20 @@
     "require": {
         "php": "^8.3.0",
         "brianium/paratest": "^7.20.0",
-        "nunomaduro/collision": "^8.9.3",
+        "composer/xdebug-handler": "^3.0.5",
+        "fidry/cpu-core-counter": "^1.3",
+        "nunomaduro/collision": "^8.9.4",
         "nunomaduro/termwind": "^2.4.0",
         "pestphp/pest-plugin": "^4.0.0",
         "pestphp/pest-plugin-arch": "^4.0.2",
         "pestphp/pest-plugin-mutate": "^4.0.1",
         "pestphp/pest-plugin-profanity": "^4.2.1",
-        "phpunit/phpunit": "^12.5.16",
+        "phpunit/phpunit": "^12.5.24",
         "symfony/process": "^7.4.8|^8.0.8"
     },
     "conflict": {
         "filp/whoops": "<2.18.3",
-        "phpunit/phpunit": ">12.5.16",
+        "phpunit/phpunit": ">12.5.24",
         "sebastian/exporter": "<7.0.0",
         "webmozart/assert": "<1.11.0"
     },
@@ -58,7 +60,7 @@
         ]
     },
     "require-dev": {
-        "mrpunyapal/peststan": "^0.2.5",
+        "mrpunyapal/peststan": "^0.2.9",
         "pestphp/pest-dev-tools": "^4.1.0",
         "pestphp/pest-plugin-browser": "^4.3.1",
         "pestphp/pest-plugin-type-coverage": "^4.0.4",
@@ -92,6 +94,7 @@
         "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 --configuration=tests-tia/phpunit.xml",
         "update:snapshots": "REBUILD_SNAPSHOTS=true php bin/pest --update-snapshots",
         "test": [
             "@test:lint",
@@ -99,7 +102,8 @@
             "@test:type:coverage",
             "@test:unit",
             "@test:parallel",
-            "@test:integration"
+            "@test:integration",
+            "@test:tia"
         ]
     },
     "extra": {
@@ -123,6 +127,7 @@
                 "Pest\\Plugins\\Verbose",
                 "Pest\\Plugins\\Version",
                 "Pest\\Plugins\\Shard",
+                "Pest\\Plugins\\Tia",
                 "Pest\\Plugins\\Parallel"
             ]
         },

overrides/Logging/JUnit/JunitXmlLogger.php

@@ -1,6 +1,39 @@
 <?php
 
+/*
+ * BSD 3-Clause License
+ *
+ * Copyright (c) 2001-2023, Sebastian Bergmann
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
 declare(strict_types=1);
+
 /*
  * This file is part of PHPUnit.
  *

overrides/Runner/TestSuiteSorter.php

@@ -0,0 +1,388 @@
+<?php
+
+/*
+ * BSD 3-Clause License
+ *
+ * Copyright (c) 2001-2023, Sebastian Bergmann
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+declare(strict_types=1);
+
+/*
+ * This file is part of PHPUnit.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace PHPUnit\Runner;
+
+use PHPUnit\Framework\DataProviderTestSuite;
+use PHPUnit\Framework\Reorderable;
+use PHPUnit\Framework\Test;
+use PHPUnit\Framework\TestCase;
+use PHPUnit\Framework\TestSuite;
+use PHPUnit\Runner\ResultCache\NullResultCache;
+use PHPUnit\Runner\ResultCache\ResultCache;
+use PHPUnit\Runner\ResultCache\ResultCacheId;
+
+use function array_diff;
+use function array_merge;
+use function array_reverse;
+use function array_splice;
+use function assert;
+use function count;
+use function in_array;
+use function max;
+use function shuffle;
+use function usort;
+
+/**
+ * @internal This class is not covered by the backward compatibility promise for PHPUnit
+ */
+final class TestSuiteSorter
+{
+    public const int ORDER_DEFAULT = 0;
+
+    public const int ORDER_RANDOMIZED = 1;
+
+    public const int ORDER_REVERSED = 2;
+
+    public const int ORDER_DEFECTS_FIRST = 3;
+
+    public const int ORDER_DURATION = 4;
+
+    public const int ORDER_SIZE = 5;
+
+    /**
+     * @var non-empty-array<non-empty-string, positive-int>
+     */
+    private const array SIZE_SORT_WEIGHT = [
+        'small' => 1,
+        'medium' => 2,
+        'large' => 3,
+        'unknown' => 4,
+    ];
+
+    /**
+     * @var array<string, int> Associative array of (string => DEFECT_SORT_WEIGHT) elements
+     */
+    private array $defectSortOrder = [];
+
+    private readonly ResultCache $cache;
+
+    public function __construct(?ResultCache $cache = null)
+    {
+        $this->cache = $cache ?? new NullResultCache;
+    }
+
+    /**
+     * @throws Exception
+     */
+    public function reorderTestsInSuite(Test $suite, int $order, bool $resolveDependencies, int $orderDefects): void
+    {
+        $allowedOrders = [
+            self::ORDER_DEFAULT,
+            self::ORDER_REVERSED,
+            self::ORDER_RANDOMIZED,
+            self::ORDER_DURATION,
+            self::ORDER_SIZE,
+        ];
+
+        if (! in_array($order, $allowedOrders, true)) {
+            // @codeCoverageIgnoreStart
+            throw new InvalidOrderException;
+            // @codeCoverageIgnoreEnd
+        }
+
+        $allowedOrderDefects = [
+            self::ORDER_DEFAULT,
+            self::ORDER_DEFECTS_FIRST,
+        ];
+
+        if (! in_array($orderDefects, $allowedOrderDefects, true)) {
+            // @codeCoverageIgnoreStart
+            throw new InvalidOrderException;
+            // @codeCoverageIgnoreEnd
+        }
+
+        if ($suite instanceof TestSuite) {
+            foreach ($suite as $_suite) {
+                $this->reorderTestsInSuite($_suite, $order, $resolveDependencies, $orderDefects);
+            }
+
+            if ($orderDefects === self::ORDER_DEFECTS_FIRST) {
+                $this->addSuiteToDefectSortOrder($suite);
+            }
+
+            $this->sort($suite, $order, $resolveDependencies, $orderDefects);
+        }
+    }
+
+    private function sort(TestSuite $suite, int $order, bool $resolveDependencies, int $orderDefects): void
+    {
+        if ($suite->tests() === []) {
+            return;
+        }
+
+        if ($order === self::ORDER_REVERSED) {
+            $suite->setTests($this->reverse($suite->tests()));
+        } elseif ($order === self::ORDER_RANDOMIZED) {
+            $suite->setTests($this->randomize($suite->tests()));
+        } elseif ($order === self::ORDER_DURATION) {
+            $suite->setTests($this->sortByDuration($suite->tests()));
+        } elseif ($order === self::ORDER_SIZE) {
+            $suite->setTests($this->sortBySize($suite->tests()));
+        }
+
+        if ($orderDefects === self::ORDER_DEFECTS_FIRST) {
+            $suite->setTests($this->sortDefectsFirst($suite->tests()));
+        }
+
+        if ($resolveDependencies && ! ($suite instanceof DataProviderTestSuite)) {
+            $tests = $suite->tests();
+
+            /** @noinspection PhpParamsInspection */
+            /** @phpstan-ignore argument.type */
+            $suite->setTests($this->resolveDependencies($tests));
+        }
+    }
+
+    private function addSuiteToDefectSortOrder(TestSuite $suite): void
+    {
+        $max = 0;
+
+        foreach ($suite->tests() as $test) {
+            assert($test instanceof Reorderable);
+
+            $sortId = $test->sortId();
+
+            if (! isset($this->defectSortOrder[$sortId])) {
+                $this->defectSortOrder[$sortId] = $this->cache->status(ResultCacheId::fromReorderable($test))->asInt();
+                $max = max($max, $this->defectSortOrder[$sortId]);
+            }
+        }
+
+        $this->defectSortOrder[$suite->sortId()] = $max;
+    }
+
+    /**
+     * @param  list<Test>  $tests
+     * @return list<Test>
+     */
+    private function reverse(array $tests): array
+    {
+        return array_reverse($tests);
+    }
+
+    /**
+     * @param  list<Test>  $tests
+     * @return list<Test>
+     */
+    private function randomize(array $tests): array
+    {
+        shuffle($tests);
+
+        return $tests;
+    }
+
+    /**
+     * @param  list<Test>  $tests
+     * @return list<Test>
+     */
+    private function sortDefectsFirst(array $tests): array
+    {
+        usort(
+            $tests,
+            fn (Test $left, Test $right) => $this->cmpDefectPriorityAndTime($left, $right),
+        );
+
+        return $tests;
+    }
+
+    /**
+     * @param  list<Test>  $tests
+     * @return list<Test>
+     */
+    private function sortByDuration(array $tests): array
+    {
+        usort(
+            $tests,
+            fn (Test $left, Test $right) => $this->cmpDuration($left, $right),
+        );
+
+        return $tests;
+    }
+
+    /**
+     * @param  list<Test>  $tests
+     * @return list<Test>
+     */
+    private function sortBySize(array $tests): array
+    {
+        usort(
+            $tests,
+            fn (Test $left, Test $right) => $this->cmpSize($left, $right),
+        );
+
+        return $tests;
+    }
+
+    /**
+     * Comparator callback function to sort tests for "reach failure as fast as possible".
+     *
+     * 1. sort tests by defect weight defined in self::DEFECT_SORT_WEIGHT
+     * 2. when tests are equally defective, sort the fastest to the front
+     * 3. do not reorder successful tests
+     */
+    private function cmpDefectPriorityAndTime(Test $a, Test $b): int
+    {
+        assert($a instanceof Reorderable);
+        assert($b instanceof Reorderable);
+
+        $priorityA = $this->defectSortOrder[$a->sortId()] ?? 0;
+        $priorityB = $this->defectSortOrder[$b->sortId()] ?? 0;
+
+        if ($priorityA !== $priorityB) {
+            // Sort defect weight descending
+            return $priorityB <=> $priorityA;
+        }
+
+        if ($priorityA > 0 || $priorityB > 0) {
+            return $this->cmpDuration($a, $b);
+        }
+
+        // do not change execution order
+        return 0;
+    }
+
+    /**
+     * Compares test duration for sorting tests by duration ascending.
+     */
+    private function cmpDuration(Test $a, Test $b): int
+    {
+        if (! ($a instanceof Reorderable && $b instanceof Reorderable)) {
+            return 0;
+        }
+
+        return $this->cache->time(ResultCacheId::fromReorderable($a)) <=> $this->cache->time(ResultCacheId::fromReorderable($b));
+    }
+
+    /**
+     * Compares test size for sorting tests small->medium->large->unknown.
+     */
+    private function cmpSize(Test $a, Test $b): int
+    {
+        $sizeA = ($a instanceof TestCase || $a instanceof DataProviderTestSuite)
+            ? $a->size()->asString()
+            : 'unknown';
+        $sizeB = ($b instanceof TestCase || $b instanceof DataProviderTestSuite)
+            ? $b->size()->asString()
+            : 'unknown';
+
+        return self::SIZE_SORT_WEIGHT[$sizeA] <=> self::SIZE_SORT_WEIGHT[$sizeB];
+    }
+
+    /**
+     * Reorder Tests within a TestCase in such a way as to resolve as many dependencies as possible.
+     * The algorithm will leave the tests in original running order when it can.
+     * For more details see the documentation for test dependencies.
+     *
+     * Short description of algorithm:
+     * 1. Pick the next Test from remaining tests to be checked for dependencies.
+     * 2. If the test has no dependencies: mark done, start again from the top
+     * 3. If the test has dependencies but none left to do: mark done, start again from the top
+     * 4. When we reach the end add any leftover tests to the end. These will be marked 'skipped' during execution.
+     *
+     * @param  array<TestCase>  $tests
+     * @return array<TestCase>
+     */
+    private function resolveDependencies(array $tests): array
+    {
+        // Pest: Fast-path. If no test in this suite declares dependencies, the
+        // original O(N^2) algorithm is wasted work — it would splice each test
+        // one-by-one back into the same order. The check deliberately walks
+        // TestCase instances directly instead of calling TestSuite::requires(),
+        // because the latter lazily builds TestSuite::provides() via
+        // ExecutionOrderDependency::mergeUnique, which is O(N^2) in the total
+        // number of tests. With thousands of tests that single call alone can
+        // burn several seconds before the sort even begins. Reading the
+        // cached TestCase::$dependencies property stays O(N) and costs nothing
+        // when no test uses `->depends()` / PHPUnit `@depends`.
+        if (! $this->anyTestHasDependencies($tests)) {
+            return $tests;
+        }
+
+        $newTestOrder = [];
+        $i = 0;
+        $provided = [];
+
+        do {
+            if (array_diff($tests[$i]->requires(), $provided) === []) {
+                $provided = array_merge($provided, $tests[$i]->provides());
+                $newTestOrder = array_merge($newTestOrder, array_splice($tests, $i, 1));
+                $i = 0;
+            } else {
+                $i++;
+            }
+        } while ($tests !== [] && ($i < count($tests)));
+
+        return array_merge($newTestOrder, $tests);
+    }
+
+    /**
+     * Cheaply determines whether any test in the tree declares @depends.
+     *
+     * Walks `TestSuite` containers recursively and inspects each `TestCase`
+     * directly so it never triggers `TestSuite::provides()`, which is O(N^2)
+     * in the total number of aggregated tests.
+     *
+     * @param  iterable<Test>  $tests
+     */
+    private function anyTestHasDependencies(iterable $tests): bool
+    {
+        foreach ($tests as $test) {
+            if ($test instanceof TestSuite) {
+                if ($this->anyTestHasDependencies($test->tests())) {
+                    return true;
+                }
+
+                continue;
+            }
+
+            if ($test instanceof TestCase && $test->requires() !== []) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}

resources/views/components/badge.php

@@ -5,6 +5,8 @@
 [$bgBadgeColor, $bgBadgeText] = match ($type) {
     'INFO' => ['blue', 'INFO'],
     'ERROR' => ['red', 'ERROR'],
+    'WARN' => ['yellow', 'WARN'],
+    'SUCCESS' => ['green', 'SUCCESS'],
 };
 
 ?>

src/Bootstrappers/BootOverrides.php

@@ -21,6 +21,7 @@ final class BootOverrides implements Bootstrapper
         'Runner/Filter/NameFilterIterator.php',
         'Runner/ResultCache/DefaultResultCache.php',
         'Runner/TestSuiteLoader.php',
+        'Runner/TestSuiteSorter.php',
         'TextUI/Command/Commands/WarmCodeCoverageCacheCommand.php',
         'TextUI/Output/Default/ProgressPrinter/Subscriber/TestSkippedSubscriber.php',
         'TextUI/TestSuiteFilterProcessor.php',

src/Bootstrappers/BootSubscribers.php

@@ -25,6 +25,17 @@ final readonly class BootSubscribers implements Bootstrapper
         Subscribers\EnsureIgnorableTestCasesAreIgnored::class,
         Subscribers\EnsureKernelDumpIsFlushed::class,
         Subscribers\EnsureTeamCityEnabled::class,
+        Subscribers\EnsureTiaIsRunningPestTestsOnly::class,
+        Subscribers\EnsureTiaCoverageIsRecorded::class,
+        Subscribers\EnsureTiaCoverageIsFlushed::class,
+        Subscribers\EnsureTiaResultsAreCollected::class,
+        Subscribers\EnsureTiaResultIsRecordedOnPassed::class,
+        Subscribers\EnsureTiaResultIsRecordedOnFailed::class,
+        Subscribers\EnsureTiaResultIsRecordedOnErrored::class,
+        Subscribers\EnsureTiaResultIsRecordedOnSkipped::class,
+        Subscribers\EnsureTiaResultIsRecordedOnIncomplete::class,
+        Subscribers\EnsureTiaResultIsRecordedOnRisky::class,
+        Subscribers\EnsureTiaAssertionsAreRecordedOnFinished::class,
     ];
 
     /**

src/Concerns/Testable.php

@@ -7,12 +7,19 @@ namespace Pest\Concerns;
 use Closure;
 use Pest\Exceptions\DatasetArgumentsMismatch;
 use Pest\Panic;
+use Pest\Plugins\Tia;
+use Pest\Plugins\Tia\Collectors;
+use Pest\Plugins\Tia\Edges\AutoloadEdges;
+use Pest\Plugins\Tia\Recorder;
+use Pest\Plugins\Tia\Replay;
 use Pest\Preset;
 use Pest\Support\ChainableClosure;
+use Pest\Support\Container;
 use Pest\Support\ExceptionTrace;
 use Pest\Support\Reflection;
 use Pest\Support\Shell;
 use Pest\TestSuite;
+use PHPUnit\Framework\AssertionFailedError;
 use PHPUnit\Framework\Attributes\PostCondition;
 use PHPUnit\Framework\IncompleteTest;
 use PHPUnit\Framework\SkippedTest;
@@ -75,6 +82,12 @@ trait Testable
      */
     public bool $__ran = false;
 
+    /**
+     * Set when a `BeforeEachable` plugin returns a cached success result.
+     * Checked in `__runTest` and `tearDown` to skip body + cleanup.
+     */
+    private bool $__cachedPass = false;
+
     /**
      * The test's test closure.
      */
@@ -227,6 +240,8 @@ trait Testable
     {
         TestSuite::getInstance()->test = $this;
 
+        $this->__cachedPass = false;
+
         $method = TestSuite::getInstance()->tests->get(self::$__filename)->getMethod($this->name());
 
         $description = $method->description;
@@ -259,8 +274,40 @@ trait Testable
         self::$__latestIssues = $method->issues;
         self::$__latestPrs = $method->prs;
 
+        /** @var Tia $tia */
+        $tia = Container::getInstance()->get(Tia::class);
+        $status = $tia->getStatus(self::$__filename, $this::class.'::'.$this->name());
+        $replay = Replay::fromStatus($status);
+
+        if ($replay !== Replay::No) {
+            assert($status !== null);
+
+            match ($replay) {
+                Replay::Pass => $this->__shortCircuitCachedPass(),
+                Replay::Skipped => $this->markTestSkipped($status->message()),
+                Replay::Incomplete => $this->markTestIncomplete($status->message()),
+                Replay::Failure => throw new AssertionFailedError($status->message() ?: 'Cached failure'),
+                Replay::No => null,
+            };
+
+            return;
+        }
+
+        $recorder = Container::getInstance()->get(Recorder::class);
+        assert($recorder instanceof Recorder);
+
+        if ($recorder->isActive()) {
+            $recorder->beginTest($this::class, $this->name(), self::$__filename);
+        }
+
+        $autoloadBeforeSetUp = $recorder->isActive()
+            ? AutoloadEdges::snapshot()
+            : [];
+
         parent::setUp();
 
+        Collectors::armAll($recorder);
+
         $beforeEach = TestSuite::getInstance()->beforeEach->get(self::$__filename)[1];
 
         if ($this->__beforeEach instanceof Closure) {
@@ -268,6 +315,24 @@ trait Testable
         }
 
         $this->__callClosure($beforeEach, $arguments);
+
+        if ($recorder->isActive() && $autoloadBeforeSetUp !== []) {
+            $recorder->linkSourcesForTest(
+                self::$__filename,
+                AutoloadEdges::newProjectFiles(
+                    $autoloadBeforeSetUp,
+                    AutoloadEdges::snapshot(),
+                    TestSuite::getInstance()->rootPath,
+                    self::$__filename,
+                ),
+            );
+        }
+    }
+
+    private function __shortCircuitCachedPass(): void
+    {
+        $this->__cachedPass = true;
+        $this->__ran = true;
     }
 
     /**
@@ -302,6 +367,12 @@ trait Testable
      */
     protected function tearDown(...$arguments): void
     {
+        if ($this->__cachedPass) {
+            TestSuite::getInstance()->test = null;
+
+            return;
+        }
+
         $afterEach = TestSuite::getInstance()->afterEach->get(self::$__filename);
 
         if ($this->__afterEach instanceof Closure) {
@@ -327,6 +398,23 @@ trait Testable
      */
     private function __runTest(Closure $closure, ...$args): mixed
     {
+        if ($this->__cachedPass) {
+            // Feed the exact assertion count captured during the recorded
+            // run so Pest's "Tests: N passed (M assertions)" banner stays
+            // accurate on replay instead of collapsing to 1-per-test.
+            /** @var Tia $tia */
+            $tia = Container::getInstance()->get(Tia::class);
+            $assertions = $tia->getAssertionCount($this::class.'::'.$this->name());
+
+            if ($assertions === 0) {
+                $this->expectNotToPerformAssertions();
+            }
+
+            $this->addToAssertionCount($assertions);
+
+            return null;
+        }
+
         $arguments = $this->__resolveTestArguments($args);
         $this->__ensureDatasetArgumentNameAndNumberMatches($arguments);
 

src/Configuration.php

@@ -119,6 +119,14 @@ final readonly class Configuration
         return new Browser\Configuration;
     }
 
+    /**
+     * Gets the TIA (Test Impact Analysis) configuration.
+     */
+    public function tia(): Plugins\Tia\Configuration
+    {
+        return new Plugins\Tia\Configuration;
+    }
+
     /**
      * Proxies calls to the uses method.
      *

src/Contracts/Restarter.php

@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Contracts;
+
+/**
+ * @internal
+ */
+interface Restarter
+{
+    /**
+     * @param  array<int, string>  $arguments
+     */
+    public function maybeRestart(string $projectRoot, array $arguments): void;
+}

src/Exceptions/BaselineFetchFailed.php

@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Exceptions;
+
+use NunoMaduro\Collision\Contracts\RenderlessEditor;
+use NunoMaduro\Collision\Contracts\RenderlessTrace;
+use Pest\Contracts\Panicable;
+use Pest\Support\View;
+use RuntimeException;
+use Symfony\Component\Console\Exception\ExceptionInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * @internal
+ */
+final class BaselineFetchFailed extends RuntimeException implements ExceptionInterface, Panicable, RenderlessEditor, RenderlessTrace
+{
+    public function __construct(
+        private readonly string $headline,
+        private readonly string $hint,
+        private readonly bool $hasAnchor = false,
+    ) {
+        parent::__construct($headline);
+    }
+
+    public function render(OutputInterface $output): void
+    {
+        View::renderUsing($output);
+
+        if (! $this->hasAnchor) {
+            View::render('components.badge', ['type' => 'ERROR', 'content' => $this->headline]);
+            $this->renderChild($output, $this->hint.' Or use [--fresh] to record locally.');
+            $output->writeln('');
+
+            return;
+        }
+
+        $this->renderChild($output, $this->headline);
+        $this->renderChild($output, $this->hint.' Or use [--fresh] to record locally.');
+        $output->writeln('');
+    }
+
+    public function exitCode(): int
+    {
+        return 1;
+    }
+
+    private function renderChild(OutputInterface $output, string $text): void
+    {
+        $output->writeln(sprintf('  <fg=gray>─ %s</>', $text));
+    }
+}

src/Exceptions/NoAffectedTestsFound.php

@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Exceptions;
+
+use InvalidArgumentException;
+use NunoMaduro\Collision\Contracts\RenderlessEditor;
+use NunoMaduro\Collision\Contracts\RenderlessTrace;
+use Pest\Contracts\Panicable;
+use Symfony\Component\Console\Exception\ExceptionInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * @internal
+ */
+final class NoAffectedTestsFound extends InvalidArgumentException implements ExceptionInterface, Panicable, RenderlessEditor, RenderlessTrace
+{
+    public function render(OutputInterface $output): void
+    {
+        $output->writeln([
+            '',
+            '  <fg=white;options=bold;bg=blue> INFO </> No affected tests found.',
+            '',
+        ]);
+    }
+
+    public function exitCode(): int
+    {
+        return 0;
+    }
+}

src/Exceptions/TiaRequiresPestTests.php

@@ -0,0 +1,46 @@
+<?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 TiaRequiresPestTests extends RuntimeException implements ExceptionInterface, Panicable, RenderlessEditor, RenderlessTrace
+{
+    public function __construct(private readonly string $className, private readonly string $file)
+    {
+        parent::__construct(sprintf(
+            'Tia mode requires Pest tests, but encountered PHPUnit class [%s] in [%s].',
+            $className,
+            $file,
+        ));
+    }
+
+    public function render(OutputInterface $output): void
+    {
+        $output->writeln([
+            '',
+            '  <fg=white;options=bold;bg=red> ERROR </> Tia mode requires Pest tests.',
+            '',
+            sprintf('  Encountered PHPUnit class <fg=yellow>%s</>', $this->className),
+            sprintf('  in <fg=gray>%s</>.', $this->file),
+            '',
+            '  Convert it to a Pest test, or run without Tia.',
+            '',
+        ]);
+    }
+
+    public function exitCode(): int
+    {
+        return 1;
+    }
+}

src/Kernel.php

@@ -36,6 +36,7 @@ final readonly class Kernel
      */
     private const array BOOTSTRAPPERS = [
         Bootstrappers\BootOverrides::class,
+        Plugins\Tia\Bootstrapper::class,
         Bootstrappers\BootSubscribers::class,
         Bootstrappers\BootFiles::class,
         Bootstrappers\BootView::class,
@@ -43,6 +44,18 @@ final readonly class Kernel
         Bootstrappers\BootExcludeList::class,
     ];
 
+    /**
+     * The Kernel restarters — resolved and invoked from `bin/pest`
+     * before any other Pest class is touched, so the list is exposed
+     * on the Kernel rather than driven from `bin/pest` directly.
+     *
+     * @var array<int, class-string<Contracts\Restarter>>
+     */
+    public const array RESTARTERS = [
+        Restarters\XdebugRestarter::class,
+        Restarters\PcovRestarter::class,
+    ];
+
     /**
      * Creates a new Kernel instance.
      */

src/Logging/Converter.php

@@ -12,7 +12,9 @@ use PHPUnit\Event\Code\Test;
 use PHPUnit\Event\Code\TestMethod;
 use PHPUnit\Event\Code\Throwable;
 use PHPUnit\Event\Test\AfterLastTestMethodErrored;
+use PHPUnit\Event\Test\AfterLastTestMethodFailed;
 use PHPUnit\Event\Test\BeforeFirstTestMethodErrored;
+use PHPUnit\Event\Test\BeforeFirstTestMethodFailed;
 use PHPUnit\Event\Test\ConsideredRisky;
 use PHPUnit\Event\Test\Errored;
 use PHPUnit\Event\Test\Failed;
@@ -255,9 +257,11 @@ final readonly class Converter
         $numberOfNotPassedTests = count(
             array_unique(
                 array_map(
-                    function (AfterLastTestMethodErrored|BeforeFirstTestMethodErrored|Errored|Failed|Skipped|ConsideredRisky|MarkedIncomplete $event): string {
+                    function (AfterLastTestMethodErrored|AfterLastTestMethodFailed|BeforeFirstTestMethodErrored|BeforeFirstTestMethodFailed|Errored|Failed|Skipped|ConsideredRisky|MarkedIncomplete $event): string {
                         if ($event instanceof BeforeFirstTestMethodErrored
-                            || $event instanceof AfterLastTestMethodErrored) {
+                            || $event instanceof AfterLastTestMethodErrored
+                            || $event instanceof BeforeFirstTestMethodFailed
+                            || $event instanceof AfterLastTestMethodFailed) {
                             return $event->testClassName();
                         }
 

src/Mixins/Expectation.php

@@ -14,6 +14,7 @@ use InvalidArgumentException;
 use JsonSerializable;
 use Pest\Exceptions\InvalidExpectationValue;
 use Pest\Matchers\Any;
+use Pest\Plugins\Snapshot;
 use Pest\Support\Arr;
 use Pest\Support\Exporter;
 use Pest\Support\NullClosure;
@@ -851,18 +852,31 @@ final class Expectation
             default => InvalidExpectationValue::expected('array|object|string'),
         };
 
-        if ($snapshots->has()) {
-            [$filename, $content] = $snapshots->get();
-
-            Assert::assertSame(
-                strtr($content, ["\r\n" => "\n", "\r" => "\n"]),
-                strtr($string, ["\r\n" => "\n", "\r" => "\n"]),
-                $message === '' ? "Failed asserting that the string value matches its snapshot ($filename)." : $message
-            );
-        } else {
+        if (! $snapshots->has()) {
             $filename = $snapshots->save($string);
 
             TestSuite::getInstance()->registerSnapshotChange("Snapshot created at [$filename]");
+        } else {
+            [$filename, $content] = $snapshots->get();
+
+            $normalizedContent = strtr($content, ["\r\n" => "\n", "\r" => "\n"]);
+            $normalizedString = strtr($string, ["\r\n" => "\n", "\r" => "\n"]);
+
+            if (Snapshot::$updateSnapshots && $normalizedContent !== $normalizedString) {
+                $snapshots->save($string);
+
+                TestSuite::getInstance()->registerSnapshotChange("Snapshot updated at [$filename]");
+            } else {
+                if (Snapshot::$updateSnapshots) {
+                    TestSuite::getInstance()->registerSnapshotChange("Snapshot unchanged at [$filename]");
+                }
+
+                Assert::assertSame(
+                    $normalizedContent,
+                    $normalizedString,
+                    $message === '' ? "Failed asserting that the string value matches its snapshot ($filename)." : $message
+                );
+            }
         }
 
         return $this;

src/Pest.php

@@ -6,7 +6,7 @@ namespace Pest;
 
 function version(): string
 {
-    return '4.6.0';
+    return '4.6.3';
 }
 
 function testDirectory(string $file = ''): string

src/Plugins/Snapshot.php

@@ -5,7 +5,6 @@ declare(strict_types=1);
 namespace Pest\Plugins;
 
 use Pest\Contracts\Plugins\HandlesArguments;
-use Pest\Exceptions\InvalidOption;
 use Pest\TestSuite;
 
 /**
@@ -15,21 +14,116 @@ final class Snapshot implements HandlesArguments
 {
     use Concerns\HandleArguments;
 
+    /**
+     * Whether snapshots should be updated on this run.
+     */
+    public static bool $updateSnapshots = false;
+
     /**
      * {@inheritDoc}
      */
     public function handleArguments(array $arguments): array
     {
+        if (Parallel::isWorker() && Parallel::getGlobal('UPDATE_SNAPSHOTS') === true) {
+            self::$updateSnapshots = true;
+
+            return $arguments;
+        }
+
         if (! $this->hasArgument('--update-snapshots', $arguments)) {
             return $arguments;
         }
 
-        if ($this->hasArgument('--parallel', $arguments)) {
-            throw new InvalidOption('The [--update-snapshots] option is not supported when running in parallel.');
+        self::$updateSnapshots = true;
+
+        if ($this->isFullRun($arguments)) {
+            TestSuite::getInstance()->snapshots->flush();
         }
 
-        TestSuite::getInstance()->snapshots->flush();
+        if ($this->hasArgument('--parallel', $arguments) || $this->hasArgument('-p', $arguments)) {
+            Parallel::setGlobal('UPDATE_SNAPSHOTS', true);
+        }
 
         return $this->popArgument('--update-snapshots', $arguments);
     }
+
+    /**
+     * Options that take a value as the next argument (rather than via "=value").
+     *
+     * @var list<string>
+     */
+    private const array FLAGS_WITH_VALUES = [
+        '--filter',
+        '--group',
+        '--exclude-group',
+        '--test-suffix',
+        '--covers',
+        '--uses',
+        '--cache-directory',
+        '--cache-result-file',
+        '--configuration',
+        '--colors',
+        '--test-directory',
+        '--bootstrap',
+        '--order-by',
+        '--random-order-seed',
+        '--log-junit',
+        '--log-teamcity',
+        '--log-events-text',
+        '--log-events-verbose-text',
+        '--coverage-clover',
+        '--coverage-cobertura',
+        '--coverage-crap4j',
+        '--coverage-html',
+        '--coverage-php',
+        '--coverage-text',
+        '--coverage-xml',
+        '--assignee',
+        '--issue',
+        '--ticket',
+        '--pr',
+        '--pull-request',
+        '--retry',
+        '--shard',
+        '--repeat',
+    ];
+
+    /**
+     * Determines whether the command targets the entire suite (no filter, no path).
+     *
+     * @param  array<int, string>  $arguments
+     */
+    private function isFullRun(array $arguments): bool
+    {
+        if ($this->hasArgument('--filter', $arguments)) {
+            return false;
+        }
+
+        $tokens = array_slice($arguments, 1);
+        $skipNext = false;
+
+        foreach ($tokens as $arg) {
+            if ($skipNext) {
+                $skipNext = false;
+
+                continue;
+            }
+
+            if ($arg === '') {
+                continue;
+            }
+
+            if ($arg[0] === '-') {
+                if (in_array($arg, self::FLAGS_WITH_VALUES, true)) {
+                    $skipNext = true;
+                }
+
+                continue;
+            }
+
+            return false;
+        }
+
+        return true;
+    }
 }

src/Plugins/Tia/BaselineSync.php

@@ -0,0 +1,713 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia;
+
+use Composer\InstalledVersions;
+use Pest\Exceptions\BaselineFetchFailed;
+use Pest\Panic;
+use Pest\Plugins\Tia;
+use Pest\Plugins\Tia\Contracts\State;
+use Pest\Support\View;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Process\Process;
+
+/**
+ * @internal
+ */
+final readonly class BaselineSync
+{
+    private const string WORKFLOW_FILE = 'tia-baseline.yml';
+
+    private const string ARTIFACT_NAME = 'pest-tia-baseline';
+
+    private const string GRAPH_ASSET = Tia::KEY_GRAPH;
+
+    private const string COVERAGE_ASSET = Tia::KEY_COVERAGE_CACHE;
+
+    private const string DOWNLOAD_CACHE_DIR = 'artifacts';
+
+    private const int DOWNLOAD_CACHE_MAX_ENTRIES = 5;
+
+    private const int FETCH_COOLDOWN_SECONDS = 86400;
+
+    public function __construct(
+        private State $state,
+        private OutputInterface $output,
+    ) {}
+
+    private function renderBadge(string $type, string $content): void
+    {
+        View::render('components.badge', ['type' => $type, 'content' => $content]);
+    }
+
+    private function renderChild(string $text): void
+    {
+        $this->output->writeln(sprintf('  <fg=gray>─ %s</>', $text));
+    }
+
+    public function fetchIfAvailable(string $projectRoot, bool $force = false, bool $hasAnchor = false): bool
+    {
+        $repo = $this->detectGitHubRepo($projectRoot);
+
+        if ($repo === null) {
+            return false;
+        }
+
+        if (! $force && ($remaining = $this->cooldownRemaining()) !== null) {
+            $this->renderBadge('WARN', sprintf(
+                'Last fetch found no baseline — next auto-retry in %s. Override with --refetch.',
+                $this->formatDuration($remaining),
+            ));
+
+            return false;
+        }
+
+        $failureKind = null;
+        $payload = $this->download($repo, $projectRoot, $failureKind, $hasAnchor);
+
+        if ($payload === null) {
+            if ($failureKind === 'no-runs' || $failureKind === null) {
+                $this->startCooldown();
+                $this->emitPublishInstructions($repo);
+            }
+
+            return false;
+        }
+
+        if (! $this->state->write(Tia::KEY_GRAPH, $payload['graph'])) {
+            return false;
+        }
+
+        if ($payload['coverage'] !== null) {
+            $this->state->write(Tia::KEY_COVERAGE_CACHE, $payload['coverage']);
+        }
+
+        $this->clearCooldown();
+
+        $this->renderBadge('INFO', sprintf(
+            'Baseline ready (%s).',
+            $this->formatSize($payload['sizeOnDisk']),
+        ));
+
+        return true;
+    }
+
+    private function cooldownRemaining(): ?int
+    {
+        $raw = $this->state->read(Tia::KEY_FETCH_COOLDOWN);
+
+        if ($raw === null) {
+            return null;
+        }
+
+        $decoded = json_decode($raw, true);
+
+        if (! is_array($decoded) || ! isset($decoded['until']) || ! is_int($decoded['until'])) {
+            return null;
+        }
+
+        $remaining = $decoded['until'] - time();
+
+        return $remaining > 0 ? $remaining : null;
+    }
+
+    private function startCooldown(): void
+    {
+        $this->state->write(Tia::KEY_FETCH_COOLDOWN, (string) json_encode([
+            'until' => time() + self::FETCH_COOLDOWN_SECONDS,
+        ]));
+    }
+
+    private function clearCooldown(): void
+    {
+        $this->state->delete(Tia::KEY_FETCH_COOLDOWN);
+    }
+
+    private function formatDuration(int $seconds): string
+    {
+        if ($seconds >= 3600) {
+            return (int) round($seconds / 3600).'h';
+        }
+
+        if ($seconds >= 60) {
+            return (int) round($seconds / 60).'m';
+        }
+
+        return $seconds.'s';
+    }
+
+    private function emitPublishInstructions(string $repo): void
+    {
+        if ($this->isCi()) {
+            $this->renderBadge('INFO', 'No baseline yet — this run will produce one.');
+
+            return;
+        }
+
+        $yaml = $this->isLaravel()
+            ? $this->laravelWorkflowYaml()
+            : $this->genericWorkflowYaml();
+
+        $this->renderBadge('WARN', 'No baseline published yet — recording locally.');
+        $this->renderChild('To share the baseline with your team, add this workflow to the repo:');
+        $this->renderChild('.github/workflows/tia-baseline.yml');
+
+        $indentedYaml = array_map(
+            static fn (string $line): string => '      '.$line,
+            explode("\n", $yaml),
+        );
+
+        $this->output->writeln(['', ...$indentedYaml, '']);
+
+        $this->renderChild(sprintf('Commit, push, then run once: gh workflow run tia-baseline.yml -R %s', $repo));
+        $this->renderChild('Details: https://pestphp.com/docs/tia/ci');
+    }
+
+    private function isCi(): bool
+    {
+        return getenv('GITHUB_ACTIONS') === 'true'
+            || getenv('GITLAB_CI') === 'true'
+            || getenv('CIRCLECI') === 'true';
+    }
+
+    private function isLaravel(): bool
+    {
+        return class_exists(InstalledVersions::class)
+            && InstalledVersions::isInstalled('laravel/framework');
+    }
+
+    private function laravelWorkflowYaml(): string
+    {
+        return <<<'YAML'
+name: TIA Baseline
+on:
+  push: { branches: [main] }
+  schedule: [{ cron: '0 3 * * *' }]
+  workflow_dispatch:
+jobs:
+  baseline:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with: { fetch-depth: 0 }
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.4'
+          coverage: xdebug
+          extensions: json, dom, curl, libxml, mbstring, zip, pdo, pdo_sqlite, sqlite3, bcmath, intl
+      - run: cp .env.example .env
+      - run: composer install --no-interaction --prefer-dist
+      - run: php artisan key:generate
+      - run: ./vendor/bin/pest --parallel --tia --coverage
+      - name: Stage baseline for upload
+        shell: bash
+        run: |
+          mkdir -p .pest-tia-baseline
+          cp -R "$HOME/.pest/tia"/*/. .pest-tia-baseline/
+      - uses: actions/upload-artifact@v4
+        with:
+          name: pest-tia-baseline
+          path: .pest-tia-baseline/
+          retention-days: 30
+YAML;
+    }
+
+    private function genericWorkflowYaml(): string
+    {
+        return <<<'YAML'
+name: TIA Baseline
+on:
+  push: { branches: [main] }
+  schedule: [{ cron: '0 3 * * *' }]
+  workflow_dispatch:
+jobs:
+  baseline:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with: { fetch-depth: 0 }
+      - uses: shivammathur/setup-php@v2
+        with: { php-version: '8.4', coverage: xdebug }
+      - run: composer install --no-interaction --prefer-dist
+      - run: ./vendor/bin/pest --parallel --tia --coverage
+      - name: Stage baseline for upload
+        shell: bash
+        run: |
+          mkdir -p .pest-tia-baseline
+          cp -R "$HOME/.pest/tia"/*/. .pest-tia-baseline/
+      - uses: actions/upload-artifact@v4
+        with:
+          name: pest-tia-baseline
+          path: .pest-tia-baseline/
+          retention-days: 30
+YAML;
+    }
+
+    private function detectGitHubRepo(string $projectRoot): ?string
+    {
+        $gitConfig = $projectRoot.DIRECTORY_SEPARATOR.'.git'.DIRECTORY_SEPARATOR.'config';
+
+        if (! is_file($gitConfig)) {
+            return null;
+        }
+
+        $content = @file_get_contents($gitConfig);
+
+        if ($content === false) {
+            return null;
+        }
+
+        if (preg_match('/\[remote "origin"\][^\[]*?url\s*=\s*(\S+)/s', $content, $match) !== 1) {
+            return null;
+        }
+
+        $url = $match[1];
+
+        if (preg_match('#^git@github\.com:([\w.-]+/[\w.-]+?)(?:\.git)?$#', $url, $m) === 1) {
+            return $m[1];
+        }
+
+        if (preg_match('#^https?://github\.com/([\w.-]+/[\w.-]+?)(?:\.git)?/?$#', $url, $m) === 1) {
+            return $m[1];
+        }
+
+        if (preg_match('#^ssh://(?:[^@/]+@)?github\.com(?::\d+)?/([\w.-]+/[\w.-]+?)(?:\.git)?/?$#i', $url, $m) === 1) {
+            return $m[1];
+        }
+
+        return null;
+    }
+
+    /**
+     * @param-out string|null $failureKind
+     *
+     * @return array{graph: string, coverage: ?string}|null
+     */
+    private function download(string $repo, string $projectRoot, ?string &$failureKind = null, bool $hasAnchor = false): ?array
+    {
+        $failureKind = null;
+
+        if (! $this->commandExists('gh')) {
+            Panic::with(new BaselineFetchFailed(
+                'GitHub CLI (gh) not found — cannot fetch baseline.',
+                'Install it from https://cli.github.com.',
+                $hasAnchor,
+            ));
+        }
+
+        if (! $this->ghAuthenticated()) {
+            Panic::with(new BaselineFetchFailed(
+                'GitHub CLI (gh) is not authenticated — cannot fetch baseline.',
+                'Run `gh auth login` and retry.',
+                $hasAnchor,
+            ));
+        }
+
+        [$runId, $listError] = $this->latestSuccessfulRunIdWithError($repo);
+
+        if ($listError !== null) {
+            $failureKind = $listError['kind'];
+
+            if (in_array($failureKind, ['forbidden', 'not-found'], true)) {
+                Panic::with(new BaselineFetchFailed(
+                    sprintf('Failed to query baseline runs — %s', $listError['message']),
+                    'Verify workflow tia-baseline.yml, artifact pest-tia-baseline, and gh token scope.',
+                    $hasAnchor,
+                ));
+            }
+
+            $this->renderBadge('WARN', sprintf(
+                'Failed to query baseline runs — %s',
+                $listError['message'],
+            ));
+
+            return null;
+        }
+
+        if ($runId === null) {
+            $failureKind = 'no-runs';
+
+            return null;
+        }
+
+        $runCacheDir = $this->downloadCacheDir($projectRoot).DIRECTORY_SEPARATOR.$this->safeRunId($runId);
+
+        if (is_file($runCacheDir.DIRECTORY_SEPARATOR.self::GRAPH_ASSET)) {
+            @touch($runCacheDir);
+
+            $this->renderBadge('INFO', sprintf(
+                'Using cached baseline from %s (run %s).',
+                $repo,
+                $runId,
+            ));
+
+            return $this->readArtifact($runCacheDir);
+        }
+
+        if (! @mkdir($runCacheDir, 0755, true) && ! is_dir($runCacheDir)) {
+            return null;
+        }
+
+        $artifactSize = $this->artifactSize($repo, $runId);
+
+        $this->renderBadge('INFO', $artifactSize !== null
+            ? sprintf(
+                'Fetching baseline (%s) from %s…',
+                $this->formatSize($artifactSize),
+                $repo,
+            )
+            : sprintf(
+                'Fetching baseline from %s…',
+                $repo,
+            ));
+
+        $process = new Process([
+            'gh', 'run', 'download', $runId,
+            '-R', $repo,
+            '-n', self::ARTIFACT_NAME,
+            '-D', $runCacheDir,
+        ]);
+        $process->setTimeout(900.0);
+        $process->start();
+
+        $startedAt = microtime(true);
+
+        while ($process->isRunning()) {
+            $this->renderDownloadProgress($runCacheDir, $artifactSize, $startedAt);
+            usleep(250_000);
+        }
+
+        $process->wait();
+        $this->clearProgressLine();
+
+        if (! $process->isSuccessful()) {
+            $this->cleanup($runCacheDir);
+
+            $diagnosis = $this->classifyGhError($process->getErrorOutput().$process->getOutput());
+            $failureKind = $diagnosis['kind'];
+
+            if (in_array($failureKind, ['forbidden', 'not-found'], true)) {
+                Panic::with(new BaselineFetchFailed(
+                    sprintf('Baseline download failed — %s', $diagnosis['message']),
+                    'Verify workflow tia-baseline.yml, artifact pest-tia-baseline, and gh token scope.',
+                    $hasAnchor,
+                ));
+            }
+
+            $this->renderBadge('WARN', sprintf(
+                'Baseline download failed — %s',
+                $diagnosis['message'],
+            ));
+
+            return null;
+        }
+
+        $payload = $this->readArtifact($runCacheDir);
+
+        if ($payload === null) {
+            $this->cleanup($runCacheDir);
+
+            Panic::with(new BaselineFetchFailed(
+                'Baseline downloaded but the artifact is missing expected files (graph.json).',
+                'Your CI publish step is broken — check the workflow that uploads pest-tia-baseline.',
+                $hasAnchor,
+            ));
+        }
+
+        $this->trimDownloadCache($projectRoot);
+
+        return $payload;
+    }
+
+    private function artifactSize(string $repo, string $runId): ?int
+    {
+        $process = new Process([
+            'gh', 'api',
+            sprintf('repos/%s/actions/runs/%s/artifacts', $repo, $runId),
+            '--jq', sprintf(
+                '.artifacts[] | select(.name == "%s") | .size_in_bytes', // @pest-ignore-type
+                self::ARTIFACT_NAME,
+            ),
+        ]);
+        $process->setTimeout(30.0);
+        $process->run();
+
+        if (! $process->isSuccessful()) {
+            return null;
+        }
+
+        $size = trim($process->getOutput());
+
+        return is_numeric($size) ? (int) $size : null;
+    }
+
+    private function renderDownloadProgress(string $dir, ?int $totalBytes, float $startedAt): void
+    {
+        $current = $this->dirSize($dir);
+        $elapsed = max(0.001, microtime(true) - $startedAt);
+        $speed = (int) ($current / $elapsed);
+
+        if ($totalBytes !== null && $totalBytes > 0) {
+            $percent = min(99, (int) floor(($current / $totalBytes) * 100));
+            $message = sprintf(
+                '  <fg=cyan>Downloading</> %s / %s (%d%%, %s/s)',
+                $this->formatSize($current),
+                $this->formatSize($totalBytes),
+                $percent,
+                $this->formatSize($speed),
+            );
+        } else {
+            $message = sprintf(
+                '  <fg=cyan>Downloading</> %s (%s/s)',
+                $this->formatSize($current),
+                $this->formatSize($speed),
+            );
+        }
+
+        $this->output->write("\r\033[K".$message);
+    }
+
+    private function clearProgressLine(): void
+    {
+        $this->output->write("\r\033[K");
+    }
+
+    private function dirSize(string $dir): int
+    {
+        if (! is_dir($dir)) {
+            return 0;
+        }
+
+        $total = 0;
+
+        $iterator = new \RecursiveIteratorIterator(
+            new \RecursiveDirectoryIterator($dir, \FilesystemIterator::SKIP_DOTS),
+        );
+
+        /** @var \SplFileInfo $entry */
+        foreach ($iterator as $entry) {
+            if ($entry->isFile()) {
+                $total += $entry->getSize();
+            }
+        }
+
+        return $total;
+    }
+
+    /**
+     * @return array{graph: string, coverage: ?string, sizeOnDisk: int}|null
+     */
+    private function readArtifact(string $dir): ?array
+    {
+        $graphPath = $dir.DIRECTORY_SEPARATOR.self::GRAPH_ASSET;
+        $coveragePath = $dir.DIRECTORY_SEPARATOR.self::COVERAGE_ASSET;
+
+        $graph = is_file($graphPath) ? @file_get_contents($graphPath) : false;
+
+        if ($graph === false) {
+            return null;
+        }
+
+        $coverage = is_file($coveragePath) ? @file_get_contents($coveragePath) : false;
+
+        return [
+            'graph' => $graph,
+            'coverage' => $coverage === false ? null : $coverage,
+            'sizeOnDisk' => $this->dirSize($dir),
+        ];
+    }
+
+    private function downloadCacheDir(string $projectRoot): string
+    {
+        return Storage::tempDir($projectRoot).DIRECTORY_SEPARATOR.self::DOWNLOAD_CACHE_DIR;
+    }
+
+    private function safeRunId(string $runId): string
+    {
+        $sanitised = preg_replace('/[^A-Za-z0-9_-]/', '', $runId) ?? '';
+
+        return $sanitised === '' ? 'unknown' : $sanitised;
+    }
+
+    private function trimDownloadCache(string $projectRoot): void
+    {
+        $root = $this->downloadCacheDir($projectRoot);
+
+        if (! is_dir($root)) {
+            return;
+        }
+
+        $entries = @scandir($root);
+
+        if ($entries === false) {
+            return;
+        }
+
+        $candidates = [];
+
+        foreach ($entries as $entry) {
+            if ($entry === '.') {
+                continue;
+            }
+            if ($entry === '..') {
+                continue;
+            }
+            $path = $root.DIRECTORY_SEPARATOR.$entry;
+
+            if (! is_dir($path)) {
+                continue;
+            }
+
+            $mtime = @filemtime($path);
+            $candidates[] = ['path' => $path, 'mtime' => $mtime === false ? 0 : $mtime];
+        }
+
+        if (count($candidates) <= self::DOWNLOAD_CACHE_MAX_ENTRIES) {
+            return;
+        }
+
+        usort(
+            $candidates,
+            static fn (array $a, array $b): int => $b['mtime'] <=> $a['mtime'],
+        );
+
+        foreach (array_slice($candidates, self::DOWNLOAD_CACHE_MAX_ENTRIES) as $stale) {
+            $this->cleanup($stale['path']);
+        }
+    }
+
+    /**
+     * @return array{0: ?string, 1: ?array{kind: string, message: string}}
+     */
+    private function latestSuccessfulRunIdWithError(string $repo): array
+    {
+        $process = new Process([
+            'gh', 'run', 'list',
+            '-R', $repo,
+            '--workflow', self::WORKFLOW_FILE,
+            '--status', 'success',
+            '--limit', '1',
+            '--json', 'databaseId',
+            '--jq', '.[0].databaseId // empty',
+        ]);
+        $process->setTimeout(30.0);
+        $process->run();
+
+        if (! $process->isSuccessful()) {
+            return [null, $this->classifyGhError($process->getErrorOutput().$process->getOutput())];
+        }
+
+        $runId = trim($process->getOutput());
+
+        return [$runId === '' ? null : $runId, null];
+    }
+
+    private function ghAuthenticated(): bool
+    {
+        $process = new Process(['gh', 'auth', 'status']);
+        $process->setTimeout(10.0);
+        $process->run();
+
+        return $process->isSuccessful();
+    }
+
+    /**
+     * @return array{kind: string, message: string}
+     */
+    private function classifyGhError(string $output): array
+    {
+        $output = trim($output);
+
+        if ($output === '') {
+            return ['kind' => 'unknown', 'message' => 'unknown error'];
+        }
+
+        if (preg_match('/(could not resolve host|connection refused|connection reset|temporary failure in name resolution|network is unreachable|no route to host|i\/o timeout|tls handshake|getaddrinfo)/i', $output) === 1) {
+            return [
+                'kind' => 'network',
+                'message' => 'network error (offline or DNS unreachable). Try again when connected.',
+            ];
+        }
+
+        if (preg_match('/(authentication failed|not logged in|requires authentication|bad credentials|401)/i', $output) === 1) {
+            return [
+                'kind' => 'gh-auth',
+                'message' => 'authentication failed — run `gh auth login` and retry.',
+            ];
+        }
+
+        if (preg_match('/(rate limit|too many requests|secondary rate limit)/i', $output) === 1) {
+            return [
+                'kind' => 'rate-limit',
+                'message' => 'GitHub API rate limit hit — try again later.',
+            ];
+        }
+
+        if (preg_match('/(404|not found|repository not found)/i', $output) === 1) {
+            return [
+                'kind' => 'not-found',
+                'message' => 'workflow or artifact not found in repo.',
+            ];
+        }
+
+        if (preg_match('/(403|forbidden|access denied)/i', $output) === 1) {
+            return [
+                'kind' => 'forbidden',
+                'message' => 'access denied — check that your `gh` token has repo + actions read scope.',
+            ];
+        }
+
+        $message = trim(strtok($output, "\n"));
+
+        return ['kind' => 'unknown', 'message' => $message];
+    }
+
+    private function commandExists(string $cmd): bool
+    {
+        $probe = new Process(['command', '-v', $cmd]);
+        $probe->run();
+
+        if ($probe->isSuccessful()) {
+            return true;
+        }
+
+        $which = new Process(['which', $cmd]);
+        $which->run();
+
+        return $which->isSuccessful();
+    }
+
+    private function cleanup(string $dir): void
+    {
+        if (! is_dir($dir)) {
+            return;
+        }
+
+        $entries = glob($dir.DIRECTORY_SEPARATOR.'*');
+
+        if ($entries !== false) {
+            foreach ($entries as $entry) {
+                if (is_file($entry)) {
+                    @unlink($entry);
+                }
+            }
+        }
+
+        @rmdir($dir);
+    }
+
+    private function formatSize(int $bytes): string
+    {
+        if ($bytes >= 1024 * 1024) {
+            return sprintf('%.1f MB', $bytes / 1024 / 1024);
+        }
+
+        if ($bytes >= 1024) {
+            return sprintf('%.1f KB', $bytes / 1024);
+        }
+
+        return $bytes.' B';
+    }
+}

src/Plugins/Tia/Bootstrapper.php

@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia;
+
+use Pest\Contracts\Bootstrapper as BootstrapperContract;
+use Pest\Plugins\Tia\Contracts\State;
+use Pest\Support\Container;
+use Pest\TestSuite;
+
+/**
+ * @internal
+ */
+final readonly class Bootstrapper implements BootstrapperContract
+{
+    public function __construct(private Container $container) {}
+
+    public function boot(): void
+    {
+        $this->container->add(State::class, new FileState($this->tempDir()));
+    }
+
+    /**
+     * across worktrees of the same repo. See {@see Storage} for the key
+     */
+    private function tempDir(): string
+    {
+        $testSuite = $this->container->get(TestSuite::class);
+        assert($testSuite instanceof TestSuite);
+
+        return Storage::tempDir($testSuite->rootPath);
+    }
+}

src/Plugins/Tia/ChangedFiles.php

@@ -0,0 +1,349 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia;
+
+use Symfony\Component\Process\Process;
+
+/**
+ * @internal
+ */
+final readonly class ChangedFiles
+{
+    public function __construct(private string $projectRoot) {}
+
+    /**
+     * @param  array<int, string>  $files  project-relative paths.
+     * @param  array<string, string>  $lastRunTree  path → content hash from last run.
+     * @return array<int, string>
+     */
+    public function filterUnchangedSinceLastRun(array $files, array $lastRunTree): array
+    {
+        if ($lastRunTree === []) {
+            return $files;
+        }
+
+        $candidates = array_fill_keys($files, true);
+
+        foreach (array_keys($lastRunTree) as $snapshotted) {
+            $candidates[$snapshotted] = true;
+        }
+
+        $remaining = [];
+
+        foreach (array_keys($candidates) as $file) {
+            $snapshot = $lastRunTree[$file] ?? null;
+            $absolute = $this->projectRoot.DIRECTORY_SEPARATOR.$file;
+            $exists = is_file($absolute);
+
+            if ($snapshot === null) {
+                $remaining[] = $file;
+
+                continue;
+            }
+
+            if (! $exists) {
+                $remaining[] = $file;
+
+                continue;
+            }
+
+            $hash = ContentHash::of($absolute);
+
+            if ($hash === false) {
+                $remaining[] = $file;
+
+                continue;
+            }
+
+            if ($hash === $snapshot) {
+                continue;
+            }
+
+            $remaining[] = $file;
+        }
+
+        return $remaining;
+    }
+
+    /**
+     * @param  array<int, string>  $files
+     * @return array<string, string> path → xxh128 content hash
+     */
+    public function snapshotTree(array $files): array
+    {
+        $out = [];
+
+        foreach ($files as $file) {
+            $absolute = $this->projectRoot.DIRECTORY_SEPARATOR.$file;
+
+            if (! is_file($absolute)) {
+                $out[$file] = '';
+
+                continue;
+            }
+
+            $hash = ContentHash::of($absolute);
+
+            if ($hash !== false) {
+                $out[$file] = $hash;
+            }
+        }
+
+        return $out;
+    }
+
+    /**
+     * @return array<int, string>|null `null` when git is unavailable, or when
+     */
+    public function since(?string $sha): ?array
+    {
+        if (! $this->gitAvailable()) {
+            return null;
+        }
+
+        $files = [];
+
+        if ($sha !== null && $sha !== '') {
+            if (! $this->shaIsReachable($sha)) {
+                return null;
+            }
+
+            $files = array_merge($files, $this->diffSinceSha($sha));
+        }
+
+        $files = array_merge($files, $this->workingTreeChanges());
+
+        $unique = [];
+
+        foreach ($files as $file) {
+            if ($file === '') {
+                continue;
+            }
+            if ($this->shouldIgnore($file)) {
+                continue;
+            }
+            $unique[$file] = true;
+        }
+
+        $candidates = array_keys($unique);
+
+        if ($sha !== null && $sha !== '') {
+            return $this->filterBehaviourallyUnchanged($candidates, $sha);
+        }
+
+        return $candidates;
+    }
+
+    /**
+     * @param  array<int, string>  $files
+     * @return array<int, string>
+     */
+    private function filterBehaviourallyUnchanged(array $files, string $sha): array
+    {
+        $remaining = [];
+
+        foreach ($files as $file) {
+            $absolute = $this->projectRoot.DIRECTORY_SEPARATOR.$file;
+
+            if (! is_file($absolute)) {
+                $remaining[] = $file;
+
+                continue;
+            }
+
+            $currentHash = ContentHash::of($absolute);
+
+            if ($currentHash === false) {
+                $remaining[] = $file;
+
+                continue;
+            }
+
+            $baselineContent = $this->contentAtSha($sha, $file);
+
+            if ($baselineContent === null) {
+                $remaining[] = $file;
+
+                continue;
+            }
+
+            $baselineHash = ContentHash::ofContent($file, $baselineContent);
+
+            if ($currentHash !== $baselineHash) {
+                $remaining[] = $file;
+            }
+        }
+
+        return $remaining;
+    }
+
+    private function contentAtSha(string $sha, string $path): ?string
+    {
+        $process = new Process(['git', 'show', $sha.':'.$path], $this->projectRoot);
+        $process->setTimeout(5.0);
+        $process->run();
+
+        if (! $process->isSuccessful()) {
+            return null;
+        }
+
+        return $process->getOutput();
+    }
+
+    private function shouldIgnore(string $path): bool
+    {
+        static $prefixes = [
+            '.pest/',
+            '.phpunit.cache/',
+            '.phpunit.result.cache',
+            'vendor/',
+            'node_modules/',
+            'bootstrap/cache/',
+        ];
+
+        foreach ($prefixes as $prefix) {
+            if (str_starts_with($path, (string) $prefix)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    public function currentBranch(): ?string
+    {
+        if (! $this->gitAvailable()) {
+            return null;
+        }
+
+        $process = new Process(['git', 'rev-parse', '--abbrev-ref', 'HEAD'], $this->projectRoot);
+        $process->run();
+
+        if (! $process->isSuccessful()) {
+            return null;
+        }
+
+        $branch = trim($process->getOutput());
+
+        return $branch === '' || $branch === 'HEAD' ? null : $branch;
+    }
+
+    public function gitAvailable(): bool
+    {
+        $process = new Process(['git', 'rev-parse', '--git-dir'], $this->projectRoot);
+        $process->run();
+
+        return $process->isSuccessful();
+    }
+
+    private function shaIsReachable(string $sha): bool
+    {
+        $process = new Process(
+            ['git', 'merge-base', '--is-ancestor', $sha, 'HEAD'],
+            $this->projectRoot,
+        );
+        $process->run();
+
+        return $process->getExitCode() === 0;
+    }
+
+    /**
+     * @return array<int, string>
+     */
+    private function diffSinceSha(string $sha): array
+    {
+        $process = new Process(
+            ['git', 'diff', '--name-only', $sha.'..HEAD'],
+            $this->projectRoot,
+        );
+        $process->run();
+
+        if (! $process->isSuccessful()) {
+            return [];
+        }
+
+        return $this->splitLines($process->getOutput());
+    }
+
+    /**
+     * @return array<int, string>
+     */
+    private function workingTreeChanges(): array
+    {
+        $process = new Process(
+            ['git', 'status', '--porcelain', '-z', '--untracked-files=all'],
+            $this->projectRoot,
+        );
+        $process->run();
+
+        if (! $process->isSuccessful()) {
+            return [];
+        }
+
+        $output = $process->getOutput();
+
+        if ($output === '') {
+            return [];
+        }
+
+        $records = explode("\x00", rtrim($output, "\x00"));
+        $files = [];
+        $count = count($records);
+
+        for ($i = 0; $i < $count; $i++) {
+            $record = $records[$i];
+
+            if (strlen($record) < 4) {
+                continue;
+            }
+
+            $status = substr($record, 0, 2);
+            $path = substr($record, 3);
+
+            if ($status[0] === 'R' || $status[0] === 'C') {
+                $files[] = $path;
+
+                if (isset($records[$i + 1]) && $records[$i + 1] !== '') {
+                    $files[] = $records[$i + 1];
+                    $i++;
+                }
+
+                continue;
+            }
+
+            $files[] = $path;
+        }
+
+        return $files;
+    }
+
+    public function currentSha(): ?string
+    {
+        if (! $this->gitAvailable()) {
+            return null;
+        }
+
+        $process = new Process(['git', 'rev-parse', 'HEAD'], $this->projectRoot);
+        $process->run();
+
+        if (! $process->isSuccessful()) {
+            return null;
+        }
+
+        $sha = trim($process->getOutput());
+
+        return $sha === '' ? null : $sha;
+    }
+
+    /**
+     * @return array<int, string>
+     */
+    private function splitLines(string $output): array
+    {
+        $lines = preg_split('/\R+/', trim($output), flags: PREG_SPLIT_NO_EMPTY);
+
+        return $lines === false ? [] : $lines;
+    }
+}

src/Plugins/Tia/Collectors.php

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia;
+
+use Pest\Plugins\Tia\Edges\BladeEdges;
+use Pest\Plugins\Tia\Edges\InertiaEdges;
+
+/**
+ * @internal
+ */
+final class Collectors
+{
+    /** @var list<class-string> */
+    private const array COLLECTORS = [
+        BladeEdges::class,
+        TableTracker::class,
+        InertiaEdges::class,
+    ];
+
+    public static function armAll(Recorder $recorder): void
+    {
+        foreach (self::COLLECTORS as $collector) {
+            $collector::arm($recorder);
+        }
+    }
+}

src/Plugins/Tia/Configuration.php

@@ -0,0 +1,63 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia;
+
+use Pest\Support\Container;
+
+/**
+ * @internal
+ */
+final class Configuration
+{
+    /**
+     * @return $this
+     */
+    public function always(): self
+    {
+        /** @var WatchPatterns $watchPatterns */
+        $watchPatterns = Container::getInstance()->get(WatchPatterns::class);
+        $watchPatterns->markEnabled();
+
+        return $this;
+    }
+
+    /**
+     * @return $this
+     */
+    public function locally(): self
+    {
+        /** @var WatchPatterns $watchPatterns */
+        $watchPatterns = Container::getInstance()->get(WatchPatterns::class);
+        $watchPatterns->markEnabled();
+        $watchPatterns->markLocally();
+
+        return $this;
+    }
+
+    /**
+     * @return $this
+     */
+    public function filtered(): self
+    {
+        /** @var WatchPatterns $watchPatterns */
+        $watchPatterns = Container::getInstance()->get(WatchPatterns::class);
+        $watchPatterns->markFiltered();
+
+        return $this;
+    }
+
+    /**
+     * @param  array<string, string>  $patterns  glob → project-relative test dir
+     * @return $this
+     */
+    public function watch(array $patterns): self
+    {
+        /** @var WatchPatterns $watchPatterns */
+        $watchPatterns = Container::getInstance()->get(WatchPatterns::class);
+        $watchPatterns->add($patterns);
+
+        return $this;
+    }
+}

src/Plugins/Tia/ContentHash.php

@@ -0,0 +1,90 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia;
+
+/**
+ * @internal
+ */
+final class ContentHash
+{
+    public static function of(string $absolute): string|false
+    {
+        $raw = @file_get_contents($absolute);
+
+        if ($raw === false) {
+            return false;
+        }
+
+        return self::ofContent($absolute, $raw);
+    }
+
+    public static function ofContent(string $path, string $raw): string
+    {
+        $lower = strtolower($path);
+
+        if (str_ends_with($lower, '.blade.php')) {
+            return self::hashBladeContent($raw);
+        }
+
+        if (str_ends_with($lower, '.php')) {
+            return self::hashPhpContent($raw);
+        }
+
+        foreach (['.vue', '.tsx', '.jsx', '.svelte', '.ts', '.js', '.mjs', '.cjs', '.mts'] as $extension) {
+            if (str_ends_with($lower, $extension)) {
+                return self::hashJsContent($raw);
+            }
+        }
+
+        return hash('xxh128', $raw);
+    }
+
+    private static function hashPhpContent(string $raw): string
+    {
+        $tokens = @token_get_all($raw);
+
+        if ($tokens === []) {
+            return hash('xxh128', $raw);
+        }
+
+        $normalised = '';
+
+        foreach ($tokens as $token) {
+            if (is_array($token)) {
+                if ($token[0] === T_WHITESPACE) {
+                    continue;
+                }
+                if ($token[0] === T_COMMENT) {
+                    continue;
+                }
+                if ($token[0] === T_DOC_COMMENT) {
+                    continue;
+                }
+                $normalised .= $token[1];
+            } else {
+                $normalised .= $token;
+            }
+        }
+
+        return hash('xxh128', $normalised);
+    }
+
+    private static function hashBladeContent(string $raw): string
+    {
+        $stripped = preg_replace('/\{\{--.*?--\}\}/s', '', $raw) ?? $raw;
+        $stripped = preg_replace('/\s+/', ' ', $stripped) ?? $stripped;
+
+        return hash('xxh128', trim($stripped));
+    }
+
+    private static function hashJsContent(string $raw): string
+    {
+        $stripped = preg_replace('/^\s*\/\/[^\n]*$/m', '', $raw) ?? $raw;
+        $stripped = preg_replace('/^\s*\/\*.*?\*\/\s*$/sm', '', $stripped) ?? $stripped;
+        $stripped = preg_replace('/\s+/', ' ', $stripped) ?? $stripped;
+
+        return hash('xxh128', trim($stripped));
+    }
+}

src/Plugins/Tia/Contracts/State.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia\Contracts;
+
+/**
+ * @internal
+ */
+interface State
+{
+    public function read(string $key): ?string;
+
+    public function write(string $key, string $content): bool;
+
+    public function delete(string $key): bool;
+
+    public function exists(string $key): bool;
+
+    /**
+     * @return list<string>
+     */
+    public function keysWithPrefix(string $prefix): array;
+}

src/Plugins/Tia/CoverageCollector.php

@@ -0,0 +1,125 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia;
+
+use PHPUnit\Runner\CodeCoverage as PhpUnitCodeCoverage;
+use ReflectionClass;
+use Throwable;
+
+/**
+ * @internal
+ */
+final class CoverageCollector
+{
+    /**
+     * @var array<string, string|null>
+     */
+    private array $classFileCache = [];
+
+    /**
+     * @return array<string, array<int, string>>
+     */
+    public function perTestFiles(): array
+    {
+        if (! PhpUnitCodeCoverage::instance()->isActive()) {
+            return [];
+        }
+
+        try {
+            $lineCoverage = PhpUnitCodeCoverage::instance()
+                ->codeCoverage()
+                ->getData()
+                ->lineCoverage();
+        } catch (Throwable) {
+            return [];
+        }
+
+        /** @var array<string, array<string, true>> $edges */
+        $edges = [];
+
+        foreach ($lineCoverage as $sourceFile => $lines) {
+            $testIds = [];
+
+            foreach ($lines as $hits) {
+                if ($hits === null) {
+                    continue;
+                }
+
+                foreach ($hits as $id) {
+                    $testIds[$id] = true;
+                }
+            }
+
+            foreach (array_keys($testIds) as $testId) {
+                $testFile = $this->testIdToFile($testId);
+
+                if ($testFile === null) {
+                    continue;
+                }
+
+                $edges[$testFile][$sourceFile] = true;
+            }
+        }
+
+        $out = [];
+
+        foreach ($edges as $testFile => $sources) {
+            $out[$testFile] = array_keys($sources);
+        }
+
+        return $out;
+    }
+
+    public function reset(): void
+    {
+        $this->classFileCache = [];
+    }
+
+    private function testIdToFile(string $testId): ?string
+    {
+        $hash = strpos($testId, '#');
+        $identifier = $hash === false ? $testId : substr($testId, 0, $hash);
+
+        if (! str_contains($identifier, '::')) {
+            return null;
+        }
+
+        [$className] = explode('::', $identifier, 2);
+
+        if (array_key_exists($className, $this->classFileCache)) {
+            return $this->classFileCache[$className];
+        }
+
+        $file = $this->resolveClassFile($className);
+        $this->classFileCache[$className] = $file;
+
+        return $file;
+    }
+
+    private function resolveClassFile(string $className): ?string
+    {
+        if (! class_exists($className, false)) {
+            return null;
+        }
+
+        $reflection = new ReflectionClass($className);
+
+        if ($reflection->hasProperty('__filename')) {
+            $property = $reflection->getProperty('__filename');
+
+            if ($property->isStatic()) {
+                $value = $property->getValue();
+
+                if (is_string($value)) {
+                    return $value;
+                }
+            }
+        }
+
+        $file = $reflection->getFileName();
+
+        return is_string($file) ? $file : null;
+    }
+}

src/Plugins/Tia/CoverageMerger.php

@@ -0,0 +1,171 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia;
+
+use Pest\Plugins\Tia;
+use Pest\Plugins\Tia\Contracts\State;
+use Pest\Support\Container;
+use SebastianBergmann\CodeCoverage\CodeCoverage;
+use Throwable;
+
+/**
+ * @internal
+ */
+final class CoverageMerger
+{
+    public static function applyIfMarked(string $reportPath): void
+    {
+        $state = self::state();
+
+        if (! $state instanceof State || ! $state->exists(Tia::KEY_COVERAGE_MARKER)) {
+            return;
+        }
+
+        $state->delete(Tia::KEY_COVERAGE_MARKER);
+
+        $cachedBytes = $state->read(Tia::KEY_COVERAGE_CACHE);
+
+        if ($cachedBytes === null) {
+            $current = self::requireCoverage($reportPath);
+
+            if ($current instanceof CodeCoverage) {
+                $state->write(Tia::KEY_COVERAGE_CACHE, self::compress(serialize($current)));
+            }
+
+            return;
+        }
+
+        $decoded = self::decompress($cachedBytes);
+
+        if ($decoded === null) {
+            $state->delete(Tia::KEY_COVERAGE_CACHE);
+
+            return;
+        }
+
+        $cached = self::unserializeCoverage($decoded);
+        $current = self::requireCoverage($reportPath);
+
+        if (! $cached instanceof CodeCoverage || ! $current instanceof CodeCoverage) {
+            return;
+        }
+
+        self::stripCurrentTestsFromCached($cached, $current);
+
+        $cached->merge($current);
+
+        $serialised = serialize($cached);
+
+        @file_put_contents(
+            $reportPath,
+            '<?php return unserialize('.var_export($serialised, true).");\n",
+        );
+        $state->write(Tia::KEY_COVERAGE_CACHE, self::compress($serialised));
+    }
+
+    private static function compress(string $bytes): string
+    {
+        $compressed = @gzencode($bytes);
+
+        return $compressed === false ? $bytes : $compressed;
+    }
+
+    private static function decompress(string $bytes): ?string
+    {
+        $decoded = @gzdecode($bytes);
+
+        return $decoded === false ? null : $decoded;
+    }
+
+    private static function stripCurrentTestsFromCached(CodeCoverage $cached, CodeCoverage $current): void
+    {
+        $currentIds = self::collectTestIds($current);
+
+        if ($currentIds === []) {
+            return;
+        }
+
+        $cachedData = $cached->getData();
+        $lineCoverage = $cachedData->lineCoverage();
+
+        foreach ($lineCoverage as $file => $lines) {
+            foreach ($lines as $line => $ids) {
+                if ($ids === null) {
+                    continue;
+                }
+                if ($ids === []) {
+                    continue;
+                }
+                $filtered = array_values(array_diff($ids, $currentIds));
+
+                if ($filtered !== $ids) {
+                    $lineCoverage[$file][$line] = $filtered;
+                }
+            }
+        }
+
+        $cachedData->setLineCoverage($lineCoverage);
+    }
+
+    /**
+     * @return array<int, string>
+     */
+    private static function collectTestIds(CodeCoverage $coverage): array
+    {
+        $ids = [];
+
+        foreach ($coverage->getData()->lineCoverage() as $lines) {
+            foreach ($lines as $hits) {
+                if ($hits === null) {
+                    continue;
+                }
+
+                foreach ($hits as $id) {
+                    $ids[$id] = true;
+                }
+            }
+        }
+
+        return array_keys($ids);
+    }
+
+    private static function state(): ?State
+    {
+        try {
+            $state = Container::getInstance()->get(State::class);
+        } catch (Throwable) {
+            return null;
+        }
+
+        return $state instanceof State ? $state : null;
+    }
+
+    private static function requireCoverage(string $reportPath): ?CodeCoverage
+    {
+        if (! is_file($reportPath)) {
+            return null;
+        }
+
+        try {
+            /** @var mixed $value */
+            $value = require $reportPath;
+        } catch (Throwable) {
+            return null;
+        }
+
+        return $value instanceof CodeCoverage ? $value : null;
+    }
+
+    private static function unserializeCoverage(string $bytes): ?CodeCoverage
+    {
+        try {
+            $value = @unserialize($bytes);
+        } catch (Throwable) {
+            return null;
+        }
+
+        return $value instanceof CodeCoverage ? $value : null;
+    }
+}

src/Plugins/Tia/Edges/AutoloadEdges.php

@@ -0,0 +1,90 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia\Edges;
+
+/**
+ * @internal
+ */
+final readonly class AutoloadEdges
+{
+    /**
+     * @return array<string, true>
+     */
+    public static function snapshot(): array
+    {
+        $files = [];
+
+        foreach (get_included_files() as $file) {
+            if ($file !== '') {
+                $files[$file] = true;
+            }
+        }
+
+        return $files;
+    }
+
+    /**
+     * @param  array<string, true>  $before
+     * @param  array<string, true>  $after
+     * @return list<string>
+     */
+    public static function newProjectFiles(array $before, array $after, string $projectRoot, ?string $testFile = null): array
+    {
+        $root = rtrim($projectRoot, DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR;
+        $testReal = is_string($testFile) && $testFile !== '' ? @realpath($testFile) : false;
+        $out = [];
+
+        foreach (array_keys($after) as $file) {
+            if (isset($before[$file])) {
+                continue;
+            }
+
+            $real = @realpath($file);
+            if ($real === false) {
+                $real = $file;
+            }
+
+            if ($testReal !== false && $real === $testReal) {
+                continue;
+            }
+
+            if (! str_starts_with($real, $root)) {
+                continue;
+            }
+
+            $relative = str_replace(DIRECTORY_SEPARATOR, '/', substr($real, strlen($root)));
+
+            if (self::ignored($relative)) {
+                continue;
+            }
+
+            if (! str_ends_with($relative, '.php')) {
+                continue;
+            }
+
+            $out[$real] = true;
+        }
+
+        return array_keys($out);
+    }
+
+    private static function ignored(string $relative): bool
+    {
+        static $prefixes = [
+            'vendor/',
+            'node_modules/',
+            'storage/framework/',
+            'bootstrap/cache/',
+        ];
+
+        foreach ($prefixes as $prefix) {
+            if (str_starts_with($relative, (string) $prefix)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}

src/Plugins/Tia/Edges/BladeEdges.php

@@ -0,0 +1,66 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia\Edges;
+
+use Pest\Plugins\Tia\Recorder;
+
+/**
+ * @internal
+ */
+final class BladeEdges
+{
+    private const string CONTAINER_CLASS = '\\Illuminate\\Container\\Container';
+
+    private const string MARKER = 'pest.tia.blade-edges-armed';
+
+    public static function arm(Recorder $recorder): void
+    {
+        if (! $recorder->isActive()) {
+            return;
+        }
+
+        $containerClass = self::CONTAINER_CLASS;
+
+        if (! class_exists($containerClass)) {
+            return;
+        }
+
+        /** @var object $app */
+        $app = $containerClass::getInstance();
+
+        if (! method_exists($app, 'bound') || ! method_exists($app, 'make') || ! method_exists($app, 'instance')) {
+            return;
+        }
+
+        if ($app->bound(self::MARKER)) {
+            return;
+        }
+
+        if (! $app->bound('view')) {
+            return;
+        }
+
+        $app->instance(self::MARKER, true);
+
+        $factory = $app->make('view');
+
+        if (! is_object($factory) || ! method_exists($factory, 'composer')) {
+            return;
+        }
+
+        $factory->composer('*', static function (object $view) use ($recorder): void {
+            if (! method_exists($view, 'getPath')) {
+                return;
+            }
+
+            /** @var mixed $path */
+            $path = $view->getPath();
+
+            if (is_string($path) && $path !== '') {
+                $recorder->linkSource($path);
+            }
+        });
+    }
+}

src/Plugins/Tia/Edges/InertiaEdges.php

@@ -0,0 +1,151 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia\Edges;
+
+use Pest\Plugins\Tia\Recorder;
+
+/**
+ * @internal
+ */
+final class InertiaEdges
+{
+    private const string CONTAINER_CLASS = '\\Illuminate\\Container\\Container';
+
+    private const string REQUEST_HANDLED_EVENT = 'Illuminate\\Foundation\\Http\\Events\\RequestHandled';
+
+    private const string MARKER = 'pest.tia.inertia-edges-armed';
+
+    public static function arm(Recorder $recorder): void
+    {
+        if (! $recorder->isActive()) {
+            return;
+        }
+
+        $containerClass = self::CONTAINER_CLASS;
+
+        if (! class_exists($containerClass)) {
+            return;
+        }
+
+        /** @var object $app */
+        $app = $containerClass::getInstance();
+
+        if (! method_exists($app, 'bound') || ! method_exists($app, 'make') || ! method_exists($app, 'instance')) {
+            return;
+        }
+
+        if ($app->bound(self::MARKER)) {
+            return;
+        }
+
+        if (! $app->bound('events')) {
+            return;
+        }
+
+        $app->instance(self::MARKER, true);
+
+        /** @var object $events */
+        $events = $app->make('events');
+
+        if (! method_exists($events, 'listen')) {
+            return;
+        }
+
+        $events->listen(self::REQUEST_HANDLED_EVENT, static function (object $event) use ($recorder): void {
+            if (! property_exists($event, 'response')) {
+                return;
+            }
+
+            /** @var mixed $response */
+            $response = $event->response;
+
+            if (! is_object($response)) {
+                return;
+            }
+
+            $component = self::extractComponent($response);
+
+            if ($component !== null) {
+                $recorder->linkInertiaComponent($component);
+            }
+        });
+    }
+
+    private static function extractComponent(object $response): ?string
+    {
+        if (property_exists($response, 'headers') && is_object($response->headers)) {
+            $headers = $response->headers;
+
+            if (method_exists($headers, 'has') && $headers->has('X-Inertia')) {
+                $content = self::readContent($response);
+
+                if ($content !== null) {
+                    /** @var mixed $decoded */
+                    $decoded = json_decode($content, true);
+
+                    if (is_array($decoded)
+                        && isset($decoded['component'])
+                        && is_string($decoded['component'])
+                        && $decoded['component'] !== '') {
+                        return $decoded['component'];
+                    }
+                }
+            }
+        }
+
+        $content = self::readContent($response);
+
+        if ($content === null) {
+            return null;
+        }
+
+        if (str_contains($content, 'type="application/json"')
+            && preg_match('#<script\b(?=[^>]*\bdata-page="app")(?=[^>]*\btype="application/json")[^>]*>(.+?)</script>#s', $content, $match) === 1) {
+            $component = self::componentFromJson(html_entity_decode($match[1]));
+
+            if ($component !== null) {
+                return $component;
+            }
+        }
+
+        if (str_contains($content, 'data-page=')
+            && preg_match('/\sdata-page="(\{[^"]+\})"/', $content, $match) === 1) {
+            $component = self::componentFromJson(html_entity_decode($match[1]));
+
+            if ($component !== null) {
+                return $component;
+            }
+        }
+
+        return null;
+    }
+
+    private static function componentFromJson(string $json): ?string
+    {
+        /** @var mixed $decoded */
+        $decoded = json_decode($json, true);
+
+        if (is_array($decoded)
+            && isset($decoded['component'])
+            && is_string($decoded['component'])
+            && $decoded['component'] !== '') {
+            return $decoded['component'];
+        }
+
+        return null;
+    }
+
+    private static function readContent(object $response): ?string
+    {
+        if (! method_exists($response, 'getContent')) {
+            return null;
+        }
+
+        /** @var mixed $content */
+        $content = $response->getContent();
+
+        return is_string($content) ? $content : null;
+    }
+}

src/Plugins/Tia/FileState.php

@@ -0,0 +1,120 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia;
+
+use Pest\Plugins\Tia\Contracts\State;
+
+/**
+ * @internal
+ */
+final readonly class FileState implements State
+{
+    private string $rootDir;
+
+    public function __construct(string $rootDir)
+    {
+        $this->rootDir = rtrim($rootDir, DIRECTORY_SEPARATOR);
+    }
+
+    public function read(string $key): ?string
+    {
+        $path = $this->pathFor($key);
+
+        if (! is_file($path)) {
+            return null;
+        }
+
+        $bytes = @file_get_contents($path);
+
+        return $bytes === false ? null : $bytes;
+    }
+
+    public function write(string $key, string $content): bool
+    {
+        if (! $this->ensureRoot()) {
+            return false;
+        }
+
+        $path = $this->pathFor($key);
+        $tmp = $path.'.'.bin2hex(random_bytes(4)).'.tmp';
+
+        if (@file_put_contents($tmp, $content) === false) {
+            return false;
+        }
+
+        if (! @rename($tmp, $path)) {
+            @unlink($tmp);
+
+            return false;
+        }
+
+        return true;
+    }
+
+    public function delete(string $key): bool
+    {
+        $path = $this->pathFor($key);
+
+        if (! is_file($path)) {
+            return true;
+        }
+
+        return @unlink($path);
+    }
+
+    public function exists(string $key): bool
+    {
+        return is_file($this->pathFor($key));
+    }
+
+    public function keysWithPrefix(string $prefix): array
+    {
+        $root = $this->resolvedRoot();
+
+        if ($root === null) {
+            return [];
+        }
+
+        $pattern = $root.DIRECTORY_SEPARATOR.$prefix.'*';
+        $matches = glob($pattern);
+
+        if ($matches === false) {
+            return [];
+        }
+
+        $keys = [];
+
+        foreach ($matches as $path) {
+            $keys[] = basename($path);
+        }
+
+        return $keys;
+    }
+
+    public function pathFor(string $key): string
+    {
+        return $this->rootDir.DIRECTORY_SEPARATOR.$key;
+    }
+
+    private function resolvedRoot(): ?string
+    {
+        $resolved = @realpath($this->rootDir);
+
+        return $resolved === false ? null : $resolved;
+    }
+
+    private function ensureRoot(): bool
+    {
+        if (is_dir($this->rootDir)) {
+            return true;
+        }
+
+        if (@mkdir($this->rootDir, 0755, true)) {
+            return true;
+        }
+
+        return is_dir($this->rootDir);
+    }
+}

src/Plugins/Tia/Fingerprint.php

@@ -0,0 +1,329 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia;
+
+/**
+ * @internal
+ */
+final readonly class Fingerprint
+{
+    private const int SCHEMA_VERSION = 14;
+
+    /**
+     * @return array{
+     *     structural: array<string, int|string|null>,
+     *     environmental: array<string, string|null>,
+     * }
+     */
+    public static function compute(string $projectRoot): array
+    {
+        return [
+            'structural' => [
+                'schema' => self::SCHEMA_VERSION,
+                'phpunit_xml' => self::hashIfExists($projectRoot.'/phpunit.xml'),
+                'phpunit_xml_dist' => self::hashIfExists($projectRoot.'/phpunit.xml.dist'),
+                'pest_factory' => self::contentHashOrNull(__DIR__.'/../../Factories/TestCaseFactory.php'),
+                'pest_method_factory' => self::contentHashOrNull(__DIR__.'/../../Factories/TestCaseMethodFactory.php'),
+                'vite_config' => self::viteConfigHash($projectRoot),
+                'package_json' => self::packageJsonHash($projectRoot),
+                'package_lock' => self::packageLockHash($projectRoot),
+                'js_config' => self::jsConfigHash($projectRoot),
+                'composer_json' => self::composerJsonHash($projectRoot),
+            ],
+            'environmental' => [
+            ],
+        ];
+    }
+
+    /**
+     * @param  array<string, mixed>  $a
+     * @param  array<string, mixed>  $b
+     */
+    public static function structuralMatches(array $a, array $b): bool
+    {
+        $aStructural = self::structuralOnly($a);
+        $bStructural = self::structuralOnly($b);
+
+        ksort($aStructural);
+        ksort($bStructural);
+
+        return $aStructural === $bStructural;
+    }
+
+    /**
+     * @param  array<string, mixed>  $stored
+     * @param  array<string, mixed>  $current
+     * @return list<string>
+     */
+    public static function structuralDrift(array $stored, array $current): array
+    {
+        $a = self::structuralOnly($stored);
+        $b = self::structuralOnly($current);
+
+        $drifts = [];
+
+        foreach ($a as $key => $value) {
+            if ($key === 'schema') {
+                continue;
+            }
+            if (($b[$key] ?? null) !== $value) {
+                $drifts[] = $key;
+            }
+        }
+
+        foreach ($b as $key => $value) {
+            if ($key === 'schema') {
+                continue;
+            }
+            if (! array_key_exists($key, $a) && $value !== null) {
+                $drifts[] = $key;
+            }
+        }
+
+        return array_values(array_unique($drifts));
+    }
+
+    /**
+     * @param  array<string, mixed>  $stored
+     * @param  array<string, mixed>  $current
+     * @return list<string>
+     */
+    public static function environmentalDrift(array $stored, array $current): array
+    {
+        $a = self::environmentalOnly($stored);
+        $b = self::environmentalOnly($current);
+
+        $drifts = [];
+
+        foreach ($a as $key => $value) {
+            if (($b[$key] ?? null) !== $value) {
+                $drifts[] = $key;
+            }
+        }
+
+        foreach ($b as $key => $value) {
+            if (! array_key_exists($key, $a) && $value !== null) {
+                $drifts[] = $key;
+            }
+        }
+
+        return array_values(array_unique($drifts));
+    }
+
+    /**
+     * @param  array<string, mixed>  $fingerprint
+     * @return array<string, mixed>
+     */
+    private static function structuralOnly(array $fingerprint): array
+    {
+        return self::bucket($fingerprint, 'structural');
+    }
+
+    /**
+     * @param  array<string, mixed>  $fingerprint
+     * @return array<string, mixed>
+     */
+    private static function environmentalOnly(array $fingerprint): array
+    {
+        return self::bucket($fingerprint, 'environmental');
+    }
+
+    /**
+     * @param  array<string, mixed>  $fingerprint
+     * @return array<string, mixed>
+     */
+    private static function bucket(array $fingerprint, string $key): array
+    {
+        $raw = $fingerprint[$key] ?? null;
+
+        if (! is_array($raw)) {
+            return [];
+        }
+
+        $normalised = [];
+
+        foreach ($raw as $k => $v) {
+            if (is_string($k)) {
+                $normalised[$k] = $v;
+            }
+        }
+
+        return $normalised;
+    }
+
+    private static function viteConfigHash(string $projectRoot): ?string
+    {
+        $parts = [];
+
+        foreach (['vite.config.ts', 'vite.config.js', 'vite.config.mjs', 'vite.config.cjs', 'vite.config.mts'] as $name) {
+            $hash = self::contentHashOrNull($projectRoot.'/'.$name);
+
+            if ($hash !== null) {
+                $parts[] = $name.':'.$hash;
+            }
+        }
+
+        return $parts === [] ? null : hash('xxh128', implode("\n", $parts));
+    }
+
+    private static function jsConfigHash(string $projectRoot): ?string
+    {
+        $parts = [];
+
+        foreach (['tsconfig.json', 'tsconfig.app.json', 'jsconfig.json'] as $name) {
+            $hash = self::hashIfExists($projectRoot.'/'.$name);
+
+            if ($hash !== null) {
+                $parts[] = $name.':'.$hash;
+            }
+        }
+
+        return $parts === [] ? null : hash('xxh128', implode("\n", $parts));
+    }
+
+    private static function packageJsonHash(string $projectRoot): ?string
+    {
+        $path = $projectRoot.'/package.json';
+
+        if (! is_file($path)) {
+            return null;
+        }
+
+        $raw = @file_get_contents($path);
+
+        if ($raw === false) {
+            return null;
+        }
+
+        $data = json_decode($raw, true);
+
+        if (! is_array($data)) {
+            $hash = @hash_file('xxh128', $path);
+
+            return $hash === false ? null : $hash;
+        }
+
+        $relevant = [
+            'type' => $data['type'] ?? null,
+            'packageManager' => $data['packageManager'] ?? null,
+            'dependencies' => $data['dependencies'] ?? null,
+            'devDependencies' => $data['devDependencies'] ?? null,
+            'optionalDependencies' => $data['optionalDependencies'] ?? null,
+            'peerDependencies' => $data['peerDependencies'] ?? null,
+            'overrides' => $data['overrides'] ?? null,
+            'resolutions' => $data['resolutions'] ?? null,
+            'imports' => $data['imports'] ?? null,
+            'exports' => $data['exports'] ?? null,
+            'browser' => $data['browser'] ?? null,
+        ];
+
+        self::sortRecursively($relevant);
+
+        $json = json_encode($relevant);
+
+        return $json === false ? null : hash('xxh128', $json);
+    }
+
+    private static function packageLockHash(string $projectRoot): ?string
+    {
+        $parts = [];
+
+        foreach (['package-lock.json', 'pnpm-lock.yaml', 'yarn.lock', 'bun.lock', 'bun.lockb'] as $name) {
+            $hash = self::hashIfExists($projectRoot.'/'.$name);
+
+            if ($hash !== null) {
+                $parts[] = $name.':'.$hash;
+            }
+        }
+
+        return $parts === [] ? null : hash('xxh128', implode("\n", $parts));
+    }
+
+    private static function composerJsonHash(string $projectRoot): ?string
+    {
+        $path = $projectRoot.'/composer.json';
+
+        if (! is_file($path)) {
+            return null;
+        }
+
+        $raw = @file_get_contents($path);
+
+        if ($raw === false) {
+            return null;
+        }
+
+        $data = json_decode($raw, true);
+
+        if (! is_array($data)) {
+            $hash = @hash_file('xxh128', $path);
+
+            return $hash === false ? null : $hash;
+        }
+
+        $config = is_array($data['config'] ?? null) ? $data['config'] : [];
+        $relevantConfig = array_intersect_key($config, [
+            'platform' => true,
+            'allow-plugins' => true,
+        ]);
+
+        $relevant = [
+            'autoload' => $data['autoload'] ?? null,
+            'autoload-dev' => $data['autoload-dev'] ?? null,
+            'require' => $data['require'] ?? null,
+            'require-dev' => $data['require-dev'] ?? null,
+            'extra' => $data['extra'] ?? null,
+            'repositories' => $data['repositories'] ?? null,
+            'minimum-stability' => $data['minimum-stability'] ?? null,
+            'prefer-stable' => $data['prefer-stable'] ?? null,
+            'config' => $relevantConfig === [] ? null : $relevantConfig,
+        ];
+
+        self::sortRecursively($relevant);
+
+        $json = json_encode($relevant);
+
+        return $json === false ? null : hash('xxh128', $json);
+    }
+
+    private static function sortRecursively(mixed &$value): void
+    {
+        if (! is_array($value)) {
+            return;
+        }
+
+        $isAssoc = ! array_is_list($value);
+
+        if ($isAssoc) {
+            ksort($value);
+        }
+
+        foreach ($value as &$child) {
+            self::sortRecursively($child);
+        }
+    }
+
+    private static function contentHashOrNull(string $path): ?string
+    {
+        if (! is_file($path)) {
+            return null;
+        }
+
+        $hash = ContentHash::of($path);
+
+        return $hash === false ? null : $hash;
+    }
+
+    private static function hashIfExists(string $path): ?string
+    {
+        if (! is_file($path)) {
+            return null;
+        }
+
+        $hash = @hash_file('xxh128', $path);
+
+        return $hash === false ? null : $hash;
+    }
+}

src/Plugins/Tia/JsImportParser.php

@@ -0,0 +1,234 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia;
+
+/**
+ * @internal
+ */
+final class JsImportParser
+{
+    private const array PAGE_EXTENSIONS = ['vue', 'tsx', 'jsx', 'svelte'];
+
+    private const array RESOLVABLE_EXTENSIONS = ['vue', 'tsx', 'jsx', 'svelte', 'ts', 'js', 'mjs', 'mts'];
+
+    private const string JS_DIR = 'resources/js';
+
+    /**
+     * @return array<string, list<string>>
+     */
+    public static function parse(string $projectRoot): array
+    {
+        $jsRoot = $projectRoot.DIRECTORY_SEPARATOR.self::JS_DIR;
+        $pagesRoot = null;
+
+        foreach (['resources/js/Pages', 'resources/js/pages'] as $candidate) {
+            $abs = $projectRoot.DIRECTORY_SEPARATOR.$candidate;
+            if (is_dir($abs)) {
+                $pagesRoot = $abs;
+
+                break;
+            }
+        }
+
+        if ($pagesRoot === null) {
+            return [];
+        }
+
+        $reverse = [];
+
+        foreach (self::collectPages($pagesRoot) as $pageAbs) {
+            $component = self::componentName($pagesRoot, $pageAbs);
+
+            if ($component === null) {
+                continue;
+            }
+
+            $visited = [];
+            self::collectTransitive($pageAbs, $projectRoot, $jsRoot, $visited);
+
+            foreach (array_keys($visited) as $depAbs) {
+                if ($depAbs === $pageAbs) {
+                    continue;
+                }
+
+                $rel = str_replace(DIRECTORY_SEPARATOR, '/', substr($depAbs, strlen($projectRoot) + 1));
+                $reverse[$rel][$component] = true;
+            }
+        }
+
+        $out = [];
+        foreach ($reverse as $path => $components) {
+            $names = array_keys($components);
+            sort($names);
+            $out[$path] = $names;
+        }
+
+        ksort($out);
+
+        return $out;
+    }
+
+    /**
+     * @return list<string>
+     */
+    private static function collectPages(string $pagesRoot): array
+    {
+        $out = [];
+        $iterator = new \RecursiveIteratorIterator(
+            new \RecursiveDirectoryIterator($pagesRoot, \FilesystemIterator::SKIP_DOTS),
+        );
+
+        foreach ($iterator as $fileInfo) {
+            if (! $fileInfo->isFile()) {
+                continue;
+            }
+
+            $ext = strtolower((string) $fileInfo->getExtension());
+            if (in_array($ext, self::PAGE_EXTENSIONS, true)) {
+                $out[] = $fileInfo->getPathname();
+            }
+        }
+
+        return $out;
+    }
+
+    private static function componentName(string $pagesRoot, string $pageAbs): ?string
+    {
+        $rel = str_replace(DIRECTORY_SEPARATOR, '/', substr($pageAbs, strlen($pagesRoot) + 1));
+        $dot = strrpos($rel, '.');
+
+        if ($dot === false) {
+            return null;
+        }
+
+        $name = substr($rel, 0, $dot);
+
+        return $name === '' ? null : $name;
+    }
+
+    /**
+     * @param  array<string, true>  $visited
+     */
+    private static function collectTransitive(string $fileAbs, string $projectRoot, string $jsRoot, array &$visited): void
+    {
+        if (isset($visited[$fileAbs])) {
+            return;
+        }
+        $visited[$fileAbs] = true;
+
+        $source = self::loadSource($fileAbs);
+        if ($source === null) {
+            return;
+        }
+
+        foreach (self::extractImports($source) as $spec) {
+            $resolved = self::resolveImport($spec, $fileAbs, $jsRoot);
+            if ($resolved === null) {
+                continue;
+            }
+            if (! is_file($resolved)) {
+                continue;
+            }
+
+            self::collectTransitive($resolved, $projectRoot, $jsRoot, $visited);
+        }
+    }
+
+    private static function loadSource(string $fileAbs): ?string
+    {
+        $content = @file_get_contents($fileAbs);
+        if ($content === false) {
+            return null;
+        }
+
+        if (str_ends_with(strtolower($fileAbs), '.vue')) {
+            $scripts = [];
+            if (preg_match_all('/<script[^>]*>(.*?)<\/script>/si', $content, $m) !== false) {
+                foreach ($m[1] as $block) {
+                    $scripts[] = $block;
+                }
+            }
+
+            return implode("\n", $scripts);
+        }
+
+        return $content;
+    }
+
+    /**
+     * @return list<string>
+     */
+    private static function extractImports(string $source): array
+    {
+        $stripped = preg_replace('#//[^\n]*#', '', $source) ?? $source;
+        $stripped = preg_replace('#/\*.*?\*/#s', '', $stripped) ?? $stripped;
+
+        $specs = [];
+
+        if (preg_match_all('/\bimport\s+(?:[^\'"()]*?\s+from\s+)?[\'"]([^\'"]+)[\'"]/', $stripped, $matches) !== false) {
+            foreach ($matches[1] as $spec) {
+                $specs[] = $spec;
+            }
+        }
+
+        if (preg_match_all('/\bimport\(\s*[\'"]([^\'"]+)[\'"]\s*\)/', $stripped, $matches) !== false) {
+            foreach ($matches[1] as $spec) {
+                $specs[] = $spec;
+            }
+        }
+
+        return $specs;
+    }
+
+    private static function resolveImport(string $spec, string $importerAbs, string $jsRoot): ?string
+    {
+        if ($spec === '' || $spec[0] === '.' || $spec[0] === '/') {
+            return self::resolveRelative($spec, $importerAbs);
+        }
+
+        if (str_starts_with($spec, '@/') || str_starts_with($spec, '~/')) {
+            $tail = substr($spec, 2);
+
+            return self::withExtension($jsRoot.DIRECTORY_SEPARATOR.str_replace('/', DIRECTORY_SEPARATOR, $tail));
+        }
+
+        return null;
+    }
+
+    private static function resolveRelative(string $spec, string $importerAbs): ?string
+    {
+        if ($spec === '' || $spec[0] === '/') {
+            return null;
+        }
+
+        $base = dirname($importerAbs);
+        $path = $base.DIRECTORY_SEPARATOR.str_replace('/', DIRECTORY_SEPARATOR, $spec);
+
+        return self::withExtension($path);
+    }
+
+    private static function withExtension(string $path): ?string
+    {
+        if (is_file($path)) {
+            return realpath($path) ?: $path;
+        }
+
+        foreach (self::RESOLVABLE_EXTENSIONS as $ext) {
+            $candidate = $path.'.'.$ext;
+            if (is_file($candidate)) {
+                return realpath($candidate) ?: $candidate;
+            }
+        }
+
+        foreach (self::RESOLVABLE_EXTENSIONS as $ext) {
+            $candidate = $path.DIRECTORY_SEPARATOR.'index.'.$ext;
+            if (is_file($candidate)) {
+                return realpath($candidate) ?: $candidate;
+            }
+        }
+
+        return null;
+    }
+}

src/Plugins/Tia/JsModuleGraph.php

@@ -0,0 +1,321 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia;
+
+use Symfony\Component\Process\ExecutableFinder;
+use Symfony\Component\Process\Process;
+
+/**
+ * @internal
+ */
+final class JsModuleGraph
+{
+    private const int NODE_TIMEOUT_SECONDS = 180;
+
+    private const string CACHE_FILE = 'js-module-graph.cache.json';
+
+    /**
+     * @return array<string, list<string>>
+     */
+    public static function build(string $projectRoot): array
+    {
+        $result = self::resolve($projectRoot);
+
+        return $result ?? [];
+    }
+
+    /**
+     * @return array<string, list<string>>|null
+     */
+    public static function buildStrict(string $projectRoot): ?array
+    {
+        return self::resolve($projectRoot);
+    }
+
+    public static function isApplicable(string $projectRoot): bool
+    {
+        if (! self::hasViteConfig($projectRoot)) {
+            return false;
+        }
+
+        foreach (['Pages', 'pages'] as $dir) {
+            if (is_dir($projectRoot.DIRECTORY_SEPARATOR.'resources'.DIRECTORY_SEPARATOR.'js'.DIRECTORY_SEPARATOR.$dir)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * @return array<string, list<string>>|null
+     */
+    private static function resolve(string $projectRoot): ?array
+    {
+        $fingerprint = self::fingerprint($projectRoot);
+
+        if ($fingerprint !== null) {
+            $cached = self::readCache($projectRoot, $fingerprint);
+
+            if ($cached !== null) {
+                return $cached;
+            }
+        }
+
+        $process = self::buildNodeProcess($projectRoot);
+
+        if (! $process instanceof Process) {
+            return null;
+        }
+
+        $process->run();
+
+        if (! $process->isSuccessful()) {
+            return null;
+        }
+
+        $result = self::parseNodeOutput($process->getOutput());
+
+        if ($result !== null && $fingerprint !== null) {
+            self::writeCache($projectRoot, $fingerprint, $result);
+        }
+
+        return $result;
+    }
+
+    private static function buildNodeProcess(string $projectRoot): ?Process
+    {
+        if (! self::hasViteConfig($projectRoot)) {
+            return null;
+        }
+
+        if (! is_dir($projectRoot.DIRECTORY_SEPARATOR.'node_modules'.DIRECTORY_SEPARATOR.'vite')) {
+            return null;
+        }
+
+        $nodeBinary = (new ExecutableFinder)->find('node');
+
+        if ($nodeBinary === null) {
+            return null;
+        }
+
+        $helperPath = dirname(__DIR__, 3).DIRECTORY_SEPARATOR.'bin'.DIRECTORY_SEPARATOR.'pest-tia-vite-deps.mjs';
+
+        if (! is_file($helperPath)) {
+            return null;
+        }
+
+        $process = new Process([$nodeBinary, $helperPath, $projectRoot], $projectRoot);
+        $process->setTimeout(self::NODE_TIMEOUT_SECONDS);
+
+        return $process;
+    }
+
+    /**
+     * @return array<string, list<string>>|null
+     */
+    private static function parseNodeOutput(string $output): ?array
+    {
+        /** @var mixed $decoded */
+        $decoded = json_decode($output, true);
+
+        if (! is_array($decoded)) {
+            return null;
+        }
+
+        $out = [];
+
+        foreach ($decoded as $path => $components) {
+            if (! is_string($path)) {
+                continue;
+            }
+            if (! is_array($components)) {
+                continue;
+            }
+            $names = [];
+
+            foreach ($components as $component) {
+                if (is_string($component) && $component !== '') {
+                    $names[] = $component;
+                }
+            }
+
+            if ($names !== []) {
+                sort($names);
+                $out[$path] = $names;
+            }
+        }
+
+        ksort($out);
+
+        return $out;
+    }
+
+    private static function fingerprint(string $projectRoot): ?string
+    {
+        if (! self::hasViteConfig($projectRoot)) {
+            return null;
+        }
+
+        $parts = [];
+
+        foreach (['vite.config.ts', 'vite.config.js', 'vite.config.mjs', 'vite.config.cjs', 'vite.config.mts'] as $name) {
+            $path = $projectRoot.DIRECTORY_SEPARATOR.$name;
+
+            if (! is_file($path)) {
+                continue;
+            }
+
+            $stat = @stat($path);
+            $bytes = @file_get_contents($path);
+
+            $parts[] = 'config:'.$name
+                .':'.($stat === false ? '0' : (string) $stat['mtime'])
+                .':'.($stat === false ? '0' : (string) $stat['size'])
+                .':'.($bytes === false ? '' : hash('sha256', $bytes));
+        }
+
+        foreach (['Pages', 'pages'] as $dir) {
+            if (is_dir($projectRoot.DIRECTORY_SEPARATOR.'resources'.DIRECTORY_SEPARATOR.'js'.DIRECTORY_SEPARATOR.$dir)) {
+                $parts[] = 'pagesDir:'.$dir;
+
+                break;
+            }
+        }
+
+        $jsRoot = $projectRoot.DIRECTORY_SEPARATOR.'resources'.DIRECTORY_SEPARATOR.'js';
+
+        if (is_dir($jsRoot)) {
+            $entries = [];
+
+            $iterator = new \RecursiveIteratorIterator(
+                new \RecursiveDirectoryIterator($jsRoot, \FilesystemIterator::SKIP_DOTS),
+                \RecursiveIteratorIterator::LEAVES_ONLY,
+            );
+
+            /** @var \SplFileInfo $file */
+            foreach ($iterator as $file) {
+                if (! $file->isFile()) {
+                    continue;
+                }
+
+                $entries[] = $file->getPathname()
+                    .':'.$file->getSize()
+                    .':'.$file->getMTime();
+            }
+
+            sort($entries);
+
+            $parts[] = 'js:'.hash('sha256', implode("\n", $entries));
+        }
+
+        return hash('sha256', implode('|', $parts));
+    }
+
+    /**
+     * @return array<string, list<string>>|null
+     */
+    private static function readCache(string $projectRoot, string $fingerprint): ?array
+    {
+        $path = self::cachePath($projectRoot);
+
+        if (! is_file($path)) {
+            return null;
+        }
+
+        $raw = @file_get_contents($path);
+
+        if ($raw === false) {
+            return null;
+        }
+
+        /** @var mixed $decoded */
+        $decoded = json_decode($raw, true);
+
+        if (! is_array($decoded)) {
+            return null;
+        }
+
+        if (($decoded['fingerprint'] ?? null) !== $fingerprint) {
+            return null;
+        }
+
+        $graph = $decoded['graph'] ?? null;
+
+        if (! is_array($graph)) {
+            return null;
+        }
+
+        $out = [];
+
+        foreach ($graph as $key => $value) {
+            if (! is_string($key)) {
+                continue;
+            }
+            if (! is_array($value)) {
+                continue;
+            }
+            $names = [];
+
+            foreach ($value as $name) {
+                if (is_string($name) && $name !== '') {
+                    $names[] = $name;
+                }
+            }
+
+            $out[$key] = $names;
+        }
+
+        return $out;
+    }
+
+    /**
+     * @param  array<string, list<string>>  $graph
+     */
+    private static function writeCache(string $projectRoot, string $fingerprint, array $graph): void
+    {
+        $path = self::cachePath($projectRoot);
+        $dir = dirname($path);
+
+        if (! is_dir($dir) && ! @mkdir($dir, 0755, true) && ! is_dir($dir)) {
+            return;
+        }
+
+        $payload = json_encode([
+            'fingerprint' => $fingerprint,
+            'graph' => $graph,
+        ]);
+
+        if ($payload === false) {
+            return;
+        }
+
+        $tmp = $path.'.tmp.'.bin2hex(random_bytes(4));
+
+        if (@file_put_contents($tmp, $payload) === false) {
+            return;
+        }
+
+        if (! @rename($tmp, $path)) {
+            @unlink($tmp);
+        }
+    }
+
+    private static function cachePath(string $projectRoot): string
+    {
+        return Storage::tempDir($projectRoot).DIRECTORY_SEPARATOR.self::CACHE_FILE;
+    }
+
+    private static function hasViteConfig(string $projectRoot): bool
+    {
+        foreach (['vite.config.ts', 'vite.config.js', 'vite.config.mjs', 'vite.config.cjs', 'vite.config.mts'] as $name) {
+            if (is_file($projectRoot.DIRECTORY_SEPARATOR.$name)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}

src/Plugins/Tia/Recorder.php

@@ -0,0 +1,700 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia;
+
+use Pest\Plugins\Tia\Edges\AutoloadEdges;
+use Pest\TestSuite;
+use ReflectionClass;
+
+/**
+ * @internal
+ */
+final class Recorder
+{
+    private ?string $currentTestFile = null;
+
+    /** @var array<string, array<string, true>> */
+    private array $perTestFiles = [];
+
+    /** @var array<string, array<string, true>> */
+    private array $perTestTables = [];
+
+    /** @var array<string, array<string, true>> */
+    private array $perTestInertiaComponents = [];
+
+    /** @var array<string, true> */
+    private array $perTestUsesDatabase = [];
+
+    /** @var array<string, string|null> */
+    private array $classFileCache = [];
+
+    /** @var array<string, bool> */
+    private array $classUsesDatabaseCache = [];
+
+    /** @var array<string, list<string>> */
+    private array $fileToClassNames = [];
+
+    /** @var array<string, true> */
+    private array $indexedClassNames = [];
+
+    /** @var array<string, list<string>> */
+    private array $classDependencyCache = [];
+
+    /** @var array<string, list<string>> */
+    private array $testImportFileCache = [];
+
+    /** @var array<string, true> */
+    private array $includedFilesAtTestStart = [];
+
+    private bool $active = false;
+
+    private bool $driverChecked = false;
+
+    private bool $driverAvailable = false;
+
+    private string $driver = 'none';
+
+    private ?SourceScope $sourceScope = null;
+
+    public function activate(): void
+    {
+        $this->active = true;
+    }
+
+    public function isActive(): bool
+    {
+        return $this->active;
+    }
+
+    public function driverAvailable(): bool
+    {
+        if (! $this->driverChecked) {
+            if (function_exists('pcov\\start')) {
+                $this->driver = 'pcov';
+                $this->driverAvailable = true;
+            } elseif (function_exists('xdebug_start_code_coverage') && function_exists('xdebug_info')) {
+                $modes = \xdebug_info('mode');
+
+                if (is_array($modes) && in_array('coverage', $modes, true)) {
+                    $this->driver = 'xdebug';
+                    $this->driverAvailable = true;
+                }
+            }
+
+            $this->driverChecked = true;
+        }
+
+        return $this->driverAvailable;
+    }
+
+    public function driver(): string
+    {
+        $this->driverAvailable();
+
+        return $this->driver;
+    }
+
+    public function beginTest(string $className, string $methodName, string $fallbackFile): void
+    {
+        if (! $this->active || ! $this->driverAvailable()) {
+            return;
+        }
+
+        if ($this->currentTestFile !== null) {
+            return;
+        }
+
+        $file = $this->resolveTestFile($className, $fallbackFile);
+
+        if ($file === null) {
+            return;
+        }
+
+        $this->currentTestFile = $file;
+        $this->includedFilesAtTestStart = AutoloadEdges::snapshot();
+
+        if ($this->classUsesDatabase($className)) {
+            $this->perTestUsesDatabase[$file] = true;
+        }
+
+        // $this->linkAncestorFiles($className);
+        // $this->linkImportedFiles($file);
+
+        if ($this->driver === 'pcov') {
+            \pcov\clear();
+            \pcov\start();
+
+            return;
+        }
+
+        \xdebug_start_code_coverage();
+    }
+
+    public function endTest(): void
+    {
+        if (! $this->active || ! $this->driverAvailable() || $this->currentTestFile === null) {
+            return;
+        }
+
+        if ($this->driver === 'pcov') {
+            \pcov\stop();
+
+            $scope = $this->sourceScope();
+            $filesToCollectCoverageFor = [];
+
+            foreach (\pcov\waiting() as $file) {
+                if (is_string($file) && $scope->contains($file)) {
+                    $filesToCollectCoverageFor[] = $file;
+                }
+            }
+
+            /** @var array<string, mixed> $data */
+            $data = \pcov\collect(\pcov\inclusive, $filesToCollectCoverageFor);
+
+            $coveredFiles = $this->filesWithExecutedLines($data);
+        } else {
+            /** @var array<string, mixed> $data */
+            $data = \xdebug_get_code_coverage();
+            \xdebug_stop_code_coverage(true);
+
+            $coveredFiles = array_keys($data);
+        }
+
+        foreach ($coveredFiles as $sourceFile) {
+            $this->perTestFiles[$this->currentTestFile][$sourceFile] = true;
+        }
+
+        foreach (AutoloadEdges::newProjectFiles(
+            $this->includedFilesAtTestStart,
+            AutoloadEdges::snapshot(),
+            TestSuite::getInstance()->rootPath,
+            $this->currentTestFile,
+        ) as $sourceFile) {
+            $this->perTestFiles[$this->currentTestFile][$sourceFile] = true;
+        }
+
+        // $this->linkSourceDependencies($coveredFiles);
+
+        $this->currentTestFile = null;
+        $this->includedFilesAtTestStart = [];
+    }
+
+    public function linkSource(string $sourceFile): void
+    {
+        if (! $this->active) {
+            return;
+        }
+
+        if ($this->currentTestFile === null) {
+            return;
+        }
+
+        if ($sourceFile === '') {
+            return;
+        }
+
+        $this->perTestFiles[$this->currentTestFile][$sourceFile] = true;
+    }
+
+    /** @param  iterable<int, string>  $sourceFiles */
+    public function linkSourcesForTest(string $testFile, iterable $sourceFiles): void
+    {
+        if (! $this->active) {
+            return;
+        }
+
+        if ($testFile === '') {
+            return;
+        }
+
+        foreach ($sourceFiles as $sourceFile) {
+            if ($sourceFile === '') {
+                continue;
+            }
+
+            $this->perTestFiles[$testFile][$sourceFile] = true;
+        }
+    }
+
+    /** @param  array<int, string>  $coveredFiles */
+    private function linkSourceDependencies(array $coveredFiles): void
+    {
+        if ($this->currentTestFile === null) {
+            return;
+        }
+
+        $this->refreshClassMap();
+
+        foreach ($coveredFiles as $coveredFile) {
+            if (! isset($this->fileToClassNames[$coveredFile])) {
+                continue;
+            }
+
+            foreach ($this->fileToClassNames[$coveredFile] as $name) {
+                foreach ($this->classDependencies($name) as $depFile) {
+                    $this->perTestFiles[$this->currentTestFile][$depFile] = true;
+                }
+            }
+        }
+    }
+
+    private function refreshClassMap(): void
+    {
+        $names = array_merge(
+            get_declared_classes(),
+            get_declared_interfaces(),
+            get_declared_traits(),
+        );
+
+        foreach ($names as $name) {
+            if (isset($this->indexedClassNames[$name])) {
+                continue;
+            }
+            $this->indexedClassNames[$name] = true;
+
+            if (! class_exists($name, false)
+                && ! interface_exists($name, false)
+                && ! trait_exists($name, false)) {
+                continue;
+            }
+
+            $reflection = new ReflectionClass($name);
+
+            if ($reflection->isInternal()) {
+                continue;
+            }
+
+            $file = $reflection->getFileName();
+
+            if (! is_string($file)) {
+                continue;
+            }
+
+            if (str_contains($file, DIRECTORY_SEPARATOR.'vendor'.DIRECTORY_SEPARATOR)) {
+                continue;
+            }
+
+            $this->fileToClassNames[$file][] = $name;
+        }
+    }
+
+    /** @return list<string> */
+    private function classDependencies(string $className): array
+    {
+        if (isset($this->classDependencyCache[$className])) {
+            return $this->classDependencyCache[$className];
+        }
+
+        if (! class_exists($className, false)
+            && ! interface_exists($className, false)
+            && ! trait_exists($className, false)) {
+            return $this->classDependencyCache[$className] = [];
+        }
+
+        $reflection = new ReflectionClass($className);
+
+        $files = [];
+
+        $linkSymbol = static function (string $name) use (&$files): void {
+            if (! class_exists($name, false)
+                && ! interface_exists($name, false)
+                && ! trait_exists($name, false)) {
+                return;
+            }
+            $r = new ReflectionClass($name);
+            if ($r->isInternal()) {
+                return;
+            }
+            $f = $r->getFileName();
+            if (! is_string($f) || str_contains($f, DIRECTORY_SEPARATOR.'vendor'.DIRECTORY_SEPARATOR)) {
+                return;
+            }
+            $files[$f] = true;
+        };
+
+        foreach ($reflection->getInterfaceNames() as $iname) {
+            $linkSymbol($iname);
+        }
+
+        foreach ($reflection->getTraitNames() as $tname) {
+            $linkSymbol($tname);
+        }
+
+        $parent = $reflection->getParentClass();
+        while ($parent !== false && ! $parent->isInternal()) {
+            $f = $parent->getFileName();
+            if (is_string($f) && ! str_contains($f, DIRECTORY_SEPARATOR.'vendor'.DIRECTORY_SEPARATOR)) {
+                $files[$f] = true;
+            }
+            foreach ($parent->getTraitNames() as $tname) {
+                $linkSymbol($tname);
+            }
+            $parent = $parent->getParentClass();
+        }
+
+        return $this->classDependencyCache[$className] = array_keys($files);
+    }
+
+    private function linkAncestorFiles(string $className): void
+    {
+        if (! class_exists($className, false)) {
+            return;
+        }
+
+        $reflection = new ReflectionClass($className);
+        $parent = $reflection->getParentClass();
+
+        while ($parent !== false) {
+            if ($parent->isInternal()) {
+                break;
+            }
+
+            $file = $parent->getFileName();
+
+            if (is_string($file) && ! str_contains($file, DIRECTORY_SEPARATOR.'vendor'.DIRECTORY_SEPARATOR)) {
+                $this->perTestFiles[(string) $this->currentTestFile][$file] = true;
+            }
+
+            $parent = $parent->getParentClass();
+        }
+    }
+
+    private function linkImportedFiles(string $testFile): void
+    {
+        if ($this->currentTestFile === null) {
+            return;
+        }
+
+        foreach ($this->importedFilesFor($testFile) as $file) {
+            $this->perTestFiles[$this->currentTestFile][$file] = true;
+        }
+    }
+
+    /**
+     * @return list<string>
+     */
+    private function importedFilesFor(string $testFile): array
+    {
+        if (array_key_exists($testFile, $this->testImportFileCache)) {
+            return $this->testImportFileCache[$testFile];
+        }
+
+        $source = @file_get_contents($testFile);
+        if ($source === false) {
+            return $this->testImportFileCache[$testFile] = [];
+        }
+
+        $files = [];
+
+        foreach ($this->importedClassNames($source) as $className) {
+            $file = $this->findAutoloadFile($className);
+
+            if ($file !== null && ! str_contains($file, DIRECTORY_SEPARATOR.'vendor'.DIRECTORY_SEPARATOR)) {
+                $files[$file] = true;
+            }
+        }
+
+        return $this->testImportFileCache[$testFile] = array_keys($files);
+    }
+
+    /**
+     * @return list<string>
+     */
+    private function importedClassNames(string $source): array
+    {
+        preg_match_all('/^use\s+(?!function\s|const\s)([^;]+);/mi', $source, $matches);
+
+        $classes = [];
+
+        foreach ($matches[1] as $import) {
+            $import = trim($import);
+
+            if ($import === '') {
+                continue;
+            }
+
+            $open = strpos($import, '{');
+            $close = strrpos($import, '}');
+
+            if ($open !== false && $close !== false && $close > $open) {
+                $prefix = trim(trim(substr($import, 0, $open)), '\\');
+                $items = explode(',', substr($import, $open + 1, $close - $open - 1));
+
+                foreach ($items as $item) {
+                    $class = $this->normaliseImportedClass($prefix.'\\'.trim($item));
+
+                    if ($class !== null) {
+                        $classes[$class] = true;
+                    }
+                }
+
+                continue;
+            }
+
+            $class = $this->normaliseImportedClass($import);
+
+            if ($class !== null) {
+                $classes[$class] = true;
+            }
+        }
+
+        return array_keys($classes);
+    }
+
+    private function normaliseImportedClass(string $import): ?string
+    {
+        $import = trim(trim($import), '\\');
+
+        if ($import === '') {
+            return null;
+        }
+
+        $parts = preg_split('/\s+as\s+/i', $import);
+        if ($parts === false) {
+            return null;
+        }
+
+        $class = trim(trim($parts[0]), '\\');
+
+        return $class === '' ? null : $class;
+    }
+
+    private function findAutoloadFile(string $className): ?string
+    {
+        foreach (spl_autoload_functions() as $loader) {
+            if (! is_array($loader)) {
+                continue;
+            }
+            if (! is_object($loader[0])) {
+                continue;
+            }
+            if (! method_exists($loader[0], 'findFile')) {
+                continue;
+            }
+
+            /** @var mixed $file */
+            $file = $loader[0]->findFile($className);
+
+            if (is_string($file) && $file !== '') {
+                $real = @realpath($file);
+
+                return $real === false ? $file : $real;
+            }
+        }
+
+        return null;
+    }
+
+    private function classUsesDatabase(string $className): bool
+    {
+        if (array_key_exists($className, $this->classUsesDatabaseCache)) {
+            return $this->classUsesDatabaseCache[$className];
+        }
+
+        if (! class_exists($className, false)) {
+            return $this->classUsesDatabaseCache[$className] = false;
+        }
+
+        static $needles = [
+            'Illuminate\\Foundation\\Testing\\RefreshDatabase' => true,
+            'Illuminate\\Foundation\\Testing\\DatabaseMigrations' => true,
+            'Illuminate\\Foundation\\Testing\\DatabaseTransactions' => true,
+        ];
+
+        $reflection = new ReflectionClass($className);
+
+        do {
+            foreach (array_keys($reflection->getTraits()) as $traitName) {
+                if (isset($needles[$traitName])) {
+                    return $this->classUsesDatabaseCache[$className] = true;
+                }
+            }
+
+            $reflection = $reflection->getParentClass();
+        } while ($reflection !== false && ! $reflection->isInternal());
+
+        return $this->classUsesDatabaseCache[$className] = false;
+    }
+
+    public function linkTable(string $table): void
+    {
+        if (! $this->active) {
+            return;
+        }
+
+        if ($this->currentTestFile === null) {
+            return;
+        }
+
+        if ($table === '') {
+            return;
+        }
+
+        $this->perTestTables[$this->currentTestFile][strtolower($table)] = true;
+    }
+
+    public function linkInertiaComponent(string $component): void
+    {
+        if (! $this->active) {
+            return;
+        }
+
+        if ($this->currentTestFile === null) {
+            return;
+        }
+
+        if ($component === '') {
+            return;
+        }
+
+        $this->perTestInertiaComponents[$this->currentTestFile][$component] = true;
+    }
+
+    /** @return array<string, array<int, string>> */
+    public function perTestFiles(): array
+    {
+        $out = [];
+
+        foreach ($this->perTestFiles as $testFile => $sources) {
+            $out[$testFile] = array_keys($sources);
+        }
+
+        return $out;
+    }
+
+    /** @return array<string, array<int, string>> */
+    public function perTestTables(): array
+    {
+        $out = [];
+
+        foreach ($this->perTestTables as $testFile => $tables) {
+            $names = array_keys($tables);
+            sort($names);
+            $out[$testFile] = $names;
+        }
+
+        return $out;
+    }
+
+    /** @return array<string, array<int, string>> */
+    public function perTestInertiaComponents(): array
+    {
+        $out = [];
+
+        foreach ($this->perTestInertiaComponents as $testFile => $components) {
+            $names = array_keys($components);
+            sort($names);
+            $out[$testFile] = $names;
+        }
+
+        return $out;
+    }
+
+    /** @return array<string, true> */
+    public function perTestUsesDatabase(): array
+    {
+        return $this->perTestUsesDatabase;
+    }
+
+    private function resolveTestFile(string $className, string $fallbackFile): ?string
+    {
+        if (array_key_exists($className, $this->classFileCache)) {
+            $file = $this->classFileCache[$className];
+        } else {
+            $file = $this->readPestFilename($className);
+            $this->classFileCache[$className] = $file;
+        }
+
+        if ($file !== null) {
+            return $file;
+        }
+
+        if ($fallbackFile !== '' && $fallbackFile !== 'unknown' && ! str_contains($fallbackFile, "eval()'d")) {
+            return $fallbackFile;
+        }
+
+        return null;
+    }
+
+    private function readPestFilename(string $className): ?string
+    {
+        if (! class_exists($className, false)) {
+            return null;
+        }
+
+        $reflection = new ReflectionClass($className);
+
+        if ($reflection->hasProperty('__filename')) {
+            $property = $reflection->getProperty('__filename');
+
+            if ($property->isStatic()) {
+                $value = $property->getValue();
+
+                if (is_string($value)) {
+                    return $value;
+                }
+            }
+        }
+
+        $file = $reflection->getFileName();
+
+        return is_string($file) ? $file : null;
+    }
+
+    /**
+     * @param  array<string, mixed>  $data
+     * @return list<string>
+     */
+    private function filesWithExecutedLines(array $data): array
+    {
+        $out = [];
+
+        foreach ($data as $file => $lines) {
+            if (! is_array($lines)) {
+                continue;
+            }
+            $covered = [];
+            foreach ($lines as $line => $count) {
+                if (is_int($count) && $count > 0) {
+                    $covered[] = $line;
+                }
+            }
+
+            if ($covered === []) {
+                continue;
+            }
+
+            $lineKeys = array_keys($lines);
+            if ($lineKeys !== [] && count($covered) === 1 && $covered[0] === max($lineKeys)) {
+                continue;
+            }
+
+            $out[] = $file;
+        }
+
+        return $out;
+    }
+
+    private function sourceScope(): SourceScope
+    {
+        return $this->sourceScope ??= SourceScope::fromProjectRoot(TestSuite::getInstance()->rootPath);
+    }
+
+    public function reset(): void
+    {
+        $this->currentTestFile = null;
+        $this->perTestFiles = [];
+        $this->perTestTables = [];
+        $this->perTestInertiaComponents = [];
+        $this->perTestUsesDatabase = [];
+        $this->classFileCache = [];
+        $this->classUsesDatabaseCache = [];
+        $this->fileToClassNames = [];
+        $this->indexedClassNames = [];
+        $this->classDependencyCache = [];
+        $this->sourceScope = null;
+        $this->active = false;
+    }
+}

src/Plugins/Tia/Replay.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia;
+
+use PHPUnit\Framework\TestStatus\TestStatus;
+
+/**
+ * @internal
+ */
+enum Replay
+{
+    case No;
+    case Pass;
+    case Skipped;
+    case Incomplete;
+    case Failure;
+
+    public static function fromStatus(?TestStatus $status): self
+    {
+        if (! $status instanceof TestStatus) {
+            return self::No;
+        }
+
+        return match (true) {
+            $status->isSuccess(), $status->isRisky() => self::Pass,
+            $status->isSkipped() => self::Skipped,
+            $status->isIncomplete() => self::Incomplete,
+            default => self::Failure,
+        };
+    }
+}

src/Plugins/Tia/ResultCollector.php

@@ -0,0 +1,149 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia;
+
+use PHPUnit\Framework\TestStatus\TestStatus;
+
+/**
+ * @internal
+ */
+final class ResultCollector
+{
+    /**
+     * @var array<string, array{status: int, message: string, time: float, assertions: int, file?: string}>
+     */
+    private array $results = [];
+
+    private ?string $currentTestId = null;
+
+    private ?string $currentTestFile = null;
+
+    private ?float $startTime = null;
+
+    public function testPrepared(string $testId, ?string $testFile = null): void
+    {
+        $this->currentTestId = $testId;
+        $this->currentTestFile = $testFile;
+        $this->startTime = microtime(true);
+    }
+
+    public function testPassed(): void
+    {
+        if ($this->currentTestId === null) {
+            return;
+        }
+
+        $this->record(TestStatus::success());
+    }
+
+    public function testFailed(string $message): void
+    {
+        if ($this->currentTestId === null) {
+            return;
+        }
+
+        $this->record(TestStatus::failure($message));
+    }
+
+    public function testErrored(string $message): void
+    {
+        if ($this->currentTestId === null) {
+            return;
+        }
+
+        $this->record(TestStatus::error($message));
+    }
+
+    public function testSkipped(string $message): void
+    {
+        if ($this->currentTestId === null) {
+            return;
+        }
+
+        $this->record(TestStatus::skipped($message));
+    }
+
+    public function testIncomplete(string $message): void
+    {
+        if ($this->currentTestId === null) {
+            return;
+        }
+
+        $this->record(TestStatus::incomplete($message));
+    }
+
+    public function testRisky(string $message): void
+    {
+        if ($this->currentTestId === null) {
+            return;
+        }
+
+        $this->record(TestStatus::risky($message));
+    }
+
+    /**
+     * @return array<string, array{status: int, message: string, time: float, assertions: int, file?: string}>
+     */
+    public function all(): array
+    {
+        return $this->results;
+    }
+
+    public function recordAssertions(string $testId, int $assertions): void
+    {
+        if (isset($this->results[$testId])) {
+            $this->results[$testId]['assertions'] = $assertions;
+        }
+    }
+
+    /**
+     * @param  array<string, array{status: int, message: string, time: float, assertions: int, file?: string}>  $results
+     */
+    public function merge(array $results): void
+    {
+        foreach ($results as $testId => $result) {
+            $this->results[$testId] = $result;
+        }
+    }
+
+    public function reset(): void
+    {
+        $this->results = [];
+        $this->currentTestId = null;
+        $this->currentTestFile = null;
+        $this->startTime = null;
+    }
+
+    public function finishTest(): void
+    {
+        $this->currentTestId = null;
+        $this->currentTestFile = null;
+        $this->startTime = null;
+    }
+
+    private function record(TestStatus $status): void
+    {
+        if ($this->currentTestId === null) {
+            return;
+        }
+
+        $time = $this->startTime !== null
+            ? round(microtime(true) - $this->startTime, 3)
+            : 0.0;
+
+        $existing = $this->results[$this->currentTestId] ?? null;
+
+        $this->results[$this->currentTestId] = [
+            'status' => $status->asInt(),
+            'message' => $status->message(),
+            'time' => $time,
+            'assertions' => $existing['assertions'] ?? 0,
+        ];
+
+        if ($this->currentTestFile !== null) {
+            $this->results[$this->currentTestId]['file'] = $this->currentTestFile;
+        }
+    }
+}

src/Plugins/Tia/SourceScope.php

@@ -0,0 +1,248 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia;
+
+/**
+ * @internal
+ */
+final readonly class SourceScope
+{
+    private const array TOP_LEVEL_NOISE = [
+        'vendor',
+        'node_modules',
+        '.git',
+        '.idea',
+        '.vscode',
+        '.github',
+        '.pest',
+        '.phpunit.cache',
+        '.cache',
+    ];
+
+    private const array NESTED_NOISE = [
+        'storage/framework',
+        'storage/logs',
+        'bootstrap/cache',
+    ];
+
+    /**
+     * @param  list<string>  $includes  Absolute, normalised directory paths.
+     * @param  list<string>  $excludes  Absolute, normalised directory paths.
+     */
+    public function __construct(
+        private array $includes,
+        private array $excludes,
+    ) {}
+
+    public static function fromProjectRoot(string $projectRoot): self
+    {
+        $configPath = self::configPath($projectRoot);
+
+        $phpunitIncludes = [];
+        $phpunitExcludes = [];
+
+        if ($configPath !== null) {
+            $xml = @simplexml_load_file($configPath);
+
+            if ($xml !== false) {
+                $configDir = dirname($configPath);
+                $phpunitIncludes = self::extractDirectories($xml, 'source/include/directory', $configDir);
+                $phpunitExcludes = self::extractDirectories($xml, 'source/exclude/directory', $configDir);
+            }
+        }
+
+        $rootIncludes = self::topLevelProjectDirs($projectRoot);
+
+        $includes = array_values(array_unique([...$phpunitIncludes, ...$rootIncludes]));
+        $excludes = array_values(array_unique([
+            ...$phpunitExcludes,
+            ...self::nestedNoiseDirs($projectRoot),
+        ]));
+
+        if ($includes === []) {
+            $includes = [self::normalise($projectRoot)];
+        }
+
+        return new self($includes, $excludes);
+    }
+
+    /**
+     * @return list<string>  Absolute, normalised paths to testsuite directories and files declared in phpunit.xml.
+     */
+    public static function testPaths(string $projectRoot): array
+    {
+        $configPath = self::configPath($projectRoot);
+
+        if ($configPath === null) {
+            return [];
+        }
+
+        $xml = @simplexml_load_file($configPath);
+
+        if ($xml === false) {
+            return [];
+        }
+
+        $configDir = dirname($configPath);
+
+        return array_values(array_unique([
+            ...self::extractDirectories($xml, 'testsuites/testsuite/directory', $configDir),
+            ...self::extractDirectories($xml, 'testsuites/testsuite/file', $configDir),
+        ]));
+    }
+
+    public function contains(string $absoluteFile): bool
+    {
+        $real = @realpath($absoluteFile);
+        $candidate = $real === false ? $absoluteFile : $real;
+        $candidate = self::normalise($candidate);
+
+        foreach ($this->excludes as $excluded) {
+            if ($this->startsWithDir($candidate, $excluded)) {
+                return false;
+            }
+        }
+
+        foreach ($this->includes as $included) {
+            if ($this->startsWithDir($candidate, $included)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * @return list<string>
+     */
+    public function includes(): array
+    {
+        return $this->includes;
+    }
+
+    private static function configPath(string $projectRoot): ?string
+    {
+        foreach (['phpunit.xml', 'phpunit.xml.dist'] as $name) {
+            $candidate = $projectRoot.DIRECTORY_SEPARATOR.$name;
+
+            if (is_file($candidate)) {
+                return $candidate;
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * @return list<string>
+     */
+    private static function extractDirectories(\SimpleXMLElement $xml, string $xpath, string $configDir): array
+    {
+        $nodes = $xml->xpath($xpath);
+
+        if (! is_array($nodes)) {
+            return [];
+        }
+
+        $out = [];
+
+        foreach ($nodes as $node) {
+            $value = trim((string) $node);
+
+            if ($value === '') {
+                continue;
+            }
+
+            $out[] = self::resolveRelative($value, $configDir);
+        }
+
+        return array_values(array_unique($out));
+    }
+
+    /**
+     * @return list<string>
+     */
+    private static function topLevelProjectDirs(string $projectRoot): array
+    {
+        $entries = @scandir($projectRoot);
+
+        if ($entries === false) {
+            return [];
+        }
+
+        $out = [];
+
+        foreach ($entries as $entry) {
+            if ($entry === '.') {
+                continue;
+            }
+            if ($entry === '..') {
+                continue;
+            }
+            if (in_array($entry, self::TOP_LEVEL_NOISE, true)) {
+                continue;
+            }
+
+            if ($entry !== '' && $entry[0] === '.') {
+                continue;
+            }
+
+            $abs = $projectRoot.DIRECTORY_SEPARATOR.$entry;
+
+            if (! is_dir($abs)) {
+                continue;
+            }
+
+            $out[] = self::normalise(@realpath($abs) ?: $abs);
+        }
+
+        return $out;
+    }
+
+    /**
+     * @return list<string>
+     */
+    private static function nestedNoiseDirs(string $projectRoot): array
+    {
+        $out = [];
+
+        foreach (self::NESTED_NOISE as $relative) {
+            $abs = $projectRoot.DIRECTORY_SEPARATOR.str_replace('/', DIRECTORY_SEPARATOR, $relative);
+            $out[] = self::normalise(@realpath($abs) ?: $abs);
+        }
+
+        return $out;
+    }
+
+    private static function resolveRelative(string $path, string $configDir): string
+    {
+        $isAbsolute = $path !== '' && ($path[0] === DIRECTORY_SEPARATOR || $path[0] === '/'
+            || (strlen($path) >= 2 && $path[1] === ':'));
+
+        $combined = $isAbsolute ? $path : $configDir.DIRECTORY_SEPARATOR.$path;
+
+        $real = @realpath($combined);
+
+        if ($real === false) {
+            return self::normalise($combined);
+        }
+
+        return self::normalise($real);
+    }
+
+    private static function normalise(string $path): string
+    {
+        return rtrim($path, '/\\');
+    }
+
+    private function startsWithDir(string $candidate, string $dir): bool
+    {
+        if ($candidate === $dir) {
+            return true;
+        }
+
+        return str_starts_with($candidate, $dir.DIRECTORY_SEPARATOR);
+    }
+}

src/Plugins/Tia/Storage.php

@@ -0,0 +1,146 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia;
+
+/**
+ * @internal
+ */
+final class Storage
+{
+    public static function tempDir(string $projectRoot): string
+    {
+        $home = self::homeDir();
+
+        if ($home === null) {
+            return $projectRoot
+                .DIRECTORY_SEPARATOR.'.pest'
+                .DIRECTORY_SEPARATOR.'tia';
+        }
+
+        return $home
+            .DIRECTORY_SEPARATOR.'.pest'
+            .DIRECTORY_SEPARATOR.'tia'
+            .DIRECTORY_SEPARATOR.self::projectKey($projectRoot);
+    }
+
+    public static function purge(string $projectRoot): void
+    {
+        $dir = self::tempDir($projectRoot);
+
+        if (! is_dir($dir)) {
+            return;
+        }
+
+        self::removeRecursive($dir);
+    }
+
+    private static function removeRecursive(string $dir): void
+    {
+        $entries = @scandir($dir);
+
+        if ($entries === false) {
+            return;
+        }
+
+        foreach ($entries as $entry) {
+            if ($entry === '.') {
+                continue;
+            }
+            if ($entry === '..') {
+                continue;
+            }
+            $path = $dir.DIRECTORY_SEPARATOR.$entry;
+
+            if (is_dir($path) && ! is_link($path)) {
+                self::removeRecursive($path);
+
+                continue;
+            }
+
+            @unlink($path);
+        }
+
+        @rmdir($dir);
+    }
+
+    private static function homeDir(): ?string
+    {
+        foreach (['HOME', 'USERPROFILE'] as $key) {
+            $value = getenv($key);
+
+            if (is_string($value) && $value !== '' && is_dir($value)) {
+                return rtrim($value, '/\\');
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     *      `git@github.com:foo/bar.git`, `ssh://git@github.com/foo/bar`
+     */
+    private static function projectKey(string $projectRoot): string
+    {
+        $origin = self::originIdentity($projectRoot);
+
+        $realpath = @realpath($projectRoot);
+        $input = $origin ?? ($realpath === false ? $projectRoot : $realpath);
+
+        $hash = substr(hash('sha256', $input), 0, 16);
+        $slug = self::slug(basename($projectRoot));
+
+        return $slug === '' ? $hash : $slug.'-'.$hash;
+    }
+
+    private static function originIdentity(string $projectRoot): ?string
+    {
+        $url = self::rawOriginUrl($projectRoot);
+
+        if ($url === null) {
+            return null;
+        }
+
+        // git@host:org/repo(.git)
+        if (preg_match('#^[\w.-]+@([\w.-]+):([\w./-]+?)(?:\.git)?/?$#', $url, $m) === 1) {
+            return strtolower($m[1].'/'.$m[2]);
+        }
+
+        // scheme://[user@]host[:port]/org/repo(.git)  — https, ssh, git, file
+        if (preg_match('#^[a-z]+://(?:[^@/]+@)?([^/:]+)(?::\d+)?/([\w./-]+?)(?:\.git)?/?$#i', $url, $m) === 1) {
+            return strtolower($m[1].'/'.$m[2]);
+        }
+
+        return strtolower($url);
+    }
+
+    private static function rawOriginUrl(string $projectRoot): ?string
+    {
+        $config = $projectRoot.DIRECTORY_SEPARATOR.'.git'.DIRECTORY_SEPARATOR.'config';
+
+        if (! is_file($config)) {
+            return null;
+        }
+
+        $raw = @file_get_contents($config);
+
+        if ($raw === false) {
+            return null;
+        }
+
+        if (preg_match('/\[remote "origin"\][^\[]*?url\s*=\s*(\S+)/s', $raw, $match) === 1) {
+            return trim($match[1]);
+        }
+
+        return null;
+    }
+
+    private static function slug(string $name): string
+    {
+        $slug = strtolower($name);
+        $slug = preg_replace('/[^a-z0-9]+/', '-', $slug) ?? '';
+
+        return trim($slug, '-');
+    }
+}

src/Plugins/Tia/TableExtractor.php

@@ -0,0 +1,136 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia;
+
+/**
+ * @internal
+ */
+final class TableExtractor
+{
+    private const array DML_PREFIXES = ['select', 'insert', 'update', 'delete'];
+
+    /**
+     * @return list<string> Sorted, deduped table names referenced by the
+     */
+    public static function fromSql(string $sql): array
+    {
+        $trimmed = ltrim($sql);
+
+        if ($trimmed === '') {
+            return [];
+        }
+
+        $prefix = strtolower(substr($trimmed, 0, 6));
+
+        $matched = false;
+        foreach (self::DML_PREFIXES as $dml) {
+            if (str_starts_with($prefix, $dml)) {
+                $matched = true;
+
+                break;
+            }
+        }
+
+        if (! $matched) {
+            return [];
+        }
+
+        $pattern = '/(?:\bfrom|\binto|\bupdate|\bjoin)\s+(?:"([^"]+)"|`([^`]+)`|\[([^\]]+)\]|(\w+))/i';
+
+        if (preg_match_all($pattern, $sql, $matches) === false) {
+            return [];
+        }
+
+        $tables = [];
+
+        for ($i = 0, $n = count($matches[0]); $i < $n; $i++) {
+            $name = $matches[1][$i] !== ''
+                ? $matches[1][$i]
+                : ($matches[2][$i] !== ''
+                    ? $matches[2][$i]
+                    : ($matches[3][$i] !== ''
+                        ? $matches[3][$i]
+                        : $matches[4][$i]));
+            if ($name === '') {
+                continue;
+            }
+            if (self::isSchemaMeta($name)) {
+                continue;
+            }
+
+            $tables[strtolower($name)] = true;
+        }
+
+        $out = array_keys($tables);
+        sort($out);
+
+        return $out;
+    }
+
+    /**
+     * @return list<string> Table names referenced by `Schema::` calls,
+     */
+    public static function fromMigrationSource(string $php): array
+    {
+        $tables = [];
+
+        $schemaPattern = '/Schema::\s*(?:create|table|drop|dropIfExists|dropColumn|dropColumns|rename)\s*\(\s*[\'"]([^\'"]+)[\'"](?:\s*,\s*[\'"]([^\'"]+)[\'"])?/';
+
+        if (preg_match_all($schemaPattern, $php, $matches) !== false) {
+            foreach ($matches[1] as $i => $primary) {
+                $tables[strtolower($primary)] = true;
+
+                $secondary = $matches[2][$i] ?? '';
+                if ($secondary !== '') {
+                    $tables[strtolower($secondary)] = true;
+                }
+            }
+        }
+
+        $ddlPattern = '/(?:CREATE|ALTER|DROP|TRUNCATE|RENAME)\s+TABLE(?:\s+IF\s+(?:NOT\s+)?EXISTS)?\s+["`\[]?(\w+)["`\]]?/i';
+
+        if (preg_match_all($ddlPattern, $php, $matches) !== false) {
+            foreach ($matches[1] as $primary) {
+                $lower = strtolower($primary);
+                if (! self::isSchemaMeta($lower)) {
+                    $tables[$lower] = true;
+                }
+            }
+        }
+
+        $dmlPatterns = [
+            '/INSERT\s+(?:IGNORE\s+)?INTO\s+["`\[]?(\w+)["`\]]?/i',
+            '/UPDATE\s+["`\[]?(\w+)["`\]]?\s+SET\b/i',
+            '/DELETE\s+FROM\s+["`\[]?(\w+)["`\]]?/i',
+            '/DB::table\(\s*[\'"]([^\'"]+)[\'"]\s*\)/',
+        ];
+
+        foreach ($dmlPatterns as $pattern) {
+            if (preg_match_all($pattern, $php, $matches) === false) {
+                continue;
+            }
+            foreach ($matches[1] as $name) {
+                $lower = strtolower($name);
+                if (! self::isSchemaMeta($lower)) {
+                    $tables[$lower] = true;
+                }
+            }
+        }
+
+        $out = array_keys($tables);
+        sort($out);
+
+        return $out;
+    }
+
+    private static function isSchemaMeta(string $name): bool
+    {
+        $lower = strtolower($name);
+
+        return in_array($lower, ['sqlite_master', 'sqlite_sequence', 'migrations'], true)
+            || str_starts_with($lower, 'pg_')
+            || str_starts_with($lower, 'information_schema');
+    }
+}

src/Plugins/Tia/TableTracker.php

@@ -0,0 +1,86 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia;
+
+/**
+ * @internal
+ */
+final class TableTracker
+{
+    private const string CONTAINER_CLASS = '\\Illuminate\\Container\\Container';
+
+    private const string MARKER = 'pest.tia.table-tracker-armed';
+
+    public static function arm(Recorder $recorder): void
+    {
+        if (! $recorder->isActive()) {
+            return;
+        }
+
+        $containerClass = self::CONTAINER_CLASS;
+
+        if (! class_exists($containerClass)) {
+            return;
+        }
+
+        /** @var object $app */
+        $app = $containerClass::getInstance();
+
+        if (! method_exists($app, 'bound') || ! method_exists($app, 'make') || ! method_exists($app, 'instance')) {
+            return;
+        }
+
+        if ($app->bound(self::MARKER)) {
+            return;
+        }
+
+        if (! $app->bound('db')) {
+            return;
+        }
+
+        $app->instance(self::MARKER, true);
+
+        $listener = static function (object $query) use ($recorder): void {
+            if (! property_exists($query, 'sql')) {
+                return;
+            }
+
+            /** @var mixed $sql */
+            $sql = $query->sql;
+
+            if (! is_string($sql) || $sql === '') {
+                return;
+            }
+
+            foreach (TableExtractor::fromSql($sql) as $table) {
+                $recorder->linkTable($table);
+            }
+        };
+
+        /** @var object $db */
+        $db = $app->make('db');
+
+        if (is_callable([$db, 'listen'])) {
+            /** @var callable $listen */
+            $listen = [$db, 'listen'];
+            $listen($listener);
+
+            return;
+        }
+
+        if (! $app->bound('events')) {
+            return;
+        }
+
+        /** @var object $events */
+        $events = $app->make('events');
+
+        if (! method_exists($events, 'listen')) {
+            return;
+        }
+
+        $events->listen('Illuminate\\Database\\Events\\QueryExecuted', $listener);
+    }
+}

src/Plugins/Tia/TestPaths.php

@@ -0,0 +1,170 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia;
+
+use Pest\TestSuite;
+
+/**
+ * Resolves the set of project-relative paths that are considered test files,
+ * driven by phpunit.xml's <testsuites>. Falls back to the runtime TestSuite
+ * configuration when no config file is present.
+ *
+ * @internal
+ */
+final readonly class TestPaths
+{
+    /**
+     * @param  list<string>  $directories  Project-relative directory prefixes (no trailing slash).
+     * @param  list<string>  $files        Project-relative file paths.
+     * @param  list<string>  $suffixes     Filename suffixes (e.g. '.php').
+     */
+    public function __construct(
+        private array $directories,
+        private array $files,
+        private array $suffixes,
+    ) {}
+
+    public static function fromProjectRoot(string $projectRoot): self
+    {
+        $configPath = self::configPath($projectRoot);
+
+        $directories = [];
+        $files = [];
+        $suffixes = ['.php'];
+
+        if ($configPath !== null) {
+            $xml = @simplexml_load_file($configPath);
+
+            if ($xml !== false) {
+                $configDir = dirname($configPath);
+
+                foreach ($xml->xpath('testsuites/testsuite/directory') ?: [] as $node) {
+                    $rel = self::toRelative((string) $node, $configDir, $projectRoot);
+
+                    if ($rel !== null) {
+                        $directories[] = $rel;
+                    }
+
+                    $suffix = (string) ($node['suffix'] ?? '');
+                    if ($suffix !== '' && ! in_array($suffix, $suffixes, true)) {
+                        $suffixes[] = str_starts_with($suffix, '.') ? $suffix : '.'.$suffix;
+                    }
+                }
+
+                foreach ($xml->xpath('testsuites/testsuite/file') ?: [] as $node) {
+                    $rel = self::toRelative((string) $node, $configDir, $projectRoot);
+
+                    if ($rel !== null) {
+                        $files[] = $rel;
+                    }
+                }
+            }
+        }
+
+        if ($directories === [] && $files === []) {
+            $fallback = self::testSuiteFallback($projectRoot);
+
+            if ($fallback !== null) {
+                $directories[] = $fallback;
+            }
+        }
+
+        return new self(
+            array_values(array_unique($directories)),
+            array_values(array_unique($files)),
+            array_values(array_unique($suffixes)),
+        );
+    }
+
+    public function isTestFile(string $relativePath): bool
+    {
+        if (in_array($relativePath, $this->files, true)) {
+            return true;
+        }
+
+        $matchesSuffix = false;
+        foreach ($this->suffixes as $suffix) {
+            if (str_ends_with($relativePath, $suffix)) {
+                $matchesSuffix = true;
+
+                break;
+            }
+        }
+
+        if (! $matchesSuffix) {
+            return false;
+        }
+
+        foreach ($this->directories as $dir) {
+            if ($dir === '') {
+                continue;
+            }
+            if (str_starts_with($relativePath, $dir.'/')) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    private static function configPath(string $projectRoot): ?string
+    {
+        foreach (['phpunit.xml', 'phpunit.xml.dist'] as $name) {
+            $candidate = $projectRoot.DIRECTORY_SEPARATOR.$name;
+
+            if (is_file($candidate)) {
+                return $candidate;
+            }
+        }
+
+        return null;
+    }
+
+    private static function toRelative(string $value, string $configDir, string $projectRoot): ?string
+    {
+        $value = trim($value);
+
+        if ($value === '') {
+            return null;
+        }
+
+        $isAbsolute = $value[0] === '/' || $value[0] === DIRECTORY_SEPARATOR
+            || (strlen($value) >= 2 && $value[1] === ':');
+
+        $combined = $isAbsolute ? $value : $configDir.DIRECTORY_SEPARATOR.$value;
+
+        $real = @realpath($combined);
+        $resolved = $real === false ? $combined : $real;
+
+        $resolved = str_replace(DIRECTORY_SEPARATOR, '/', $resolved);
+        $root = str_replace(DIRECTORY_SEPARATOR, '/', rtrim($projectRoot, '/\\')).'/';
+
+        if (! str_starts_with($resolved.'/', $root)) {
+            return null;
+        }
+
+        return rtrim(substr($resolved, strlen($root)), '/');
+    }
+
+    private static function testSuiteFallback(string $projectRoot): ?string
+    {
+        try {
+            $testPath = TestSuite::getInstance()->testPath;
+        } catch (\Throwable) {
+            return null;
+        }
+
+        $real = @realpath($testPath);
+        $resolved = $real === false ? $testPath : $real;
+        $resolved = str_replace(DIRECTORY_SEPARATOR, '/', $resolved);
+        $root = str_replace(DIRECTORY_SEPARATOR, '/', rtrim($projectRoot, '/\\')).'/';
+
+        if (! str_starts_with($resolved.'/', $root)) {
+            return null;
+        }
+
+        return rtrim(substr($resolved, strlen($root)), '/');
+    }
+}

src/Plugins/Tia/WatchDefaults/Browser.php

@@ -0,0 +1,118 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia\WatchDefaults;
+
+use Composer\InstalledVersions;
+use Pest\Browser\Support\BrowserTestIdentifier;
+use Pest\Factories\TestCaseFactory;
+use Pest\TestSuite;
+
+/**
+ * @internal
+ */
+final readonly class Browser implements WatchDefault
+{
+    public function applicable(): bool
+    {
+        return class_exists(InstalledVersions::class)
+            && InstalledVersions::isInstalled('pestphp/pest-plugin-browser');
+    }
+
+    public function defaults(string $projectRoot, string $testPath): array
+    {
+        $browserTargets = self::detectBrowserTestTargets($projectRoot, $testPath);
+
+        $globs = [
+            'resources/js/**/*.js',
+            'resources/js/**/*.ts',
+            'resources/js/**/*.tsx',
+            'resources/js/**/*.jsx',
+            'resources/js/**/*.vue',
+            'resources/js/**/*.svelte',
+            'resources/css/**/*.css',
+            'resources/css/**/*.scss',
+            'resources/css/**/*.less',
+            'public/build/**/*.js',
+            'public/build/**/*.css',
+            'public/**/*.js',
+            'public/**/*.css',
+            'public/**/*.svg',
+            'public/**/*.png',
+            'public/**/*.jpg',
+            'public/**/*.jpeg',
+            'public/**/*.webp',
+            'public/**/*.ico',
+            'public/**/*.txt',
+            'public/**/*.json',
+            'public/**/*.xml',
+            'public/hot',
+        ];
+
+        $patterns = [];
+
+        foreach ($globs as $glob) {
+            $patterns[$glob] = $browserTargets;
+        }
+
+        return $patterns;
+    }
+
+    /**
+     * @return array<int, string>
+     */
+    public static function detectBrowserTestTargets(string $projectRoot, string $testPath): array
+    {
+        $targets = [];
+
+        $candidate = $testPath.'/Browser';
+
+        if (is_dir($projectRoot.DIRECTORY_SEPARATOR.$candidate)) {
+            $targets[] = $candidate;
+        }
+
+        if (class_exists(BrowserTestIdentifier::class)) {
+            $repo = TestSuite::getInstance()->tests;
+
+            foreach ($repo->getFilenames() as $filename) {
+                $factory = $repo->get($filename);
+
+                if (! $factory instanceof TestCaseFactory) {
+                    continue;
+                }
+
+                foreach ($factory->methods as $method) {
+                    if (BrowserTestIdentifier::isBrowserTest($method)) {
+                        $rel = self::fileRelative($projectRoot, $filename);
+
+                        if ($rel !== null) {
+                            $targets[] = $rel;
+                        }
+
+                        break;
+                    }
+                }
+            }
+        }
+
+        return array_values(array_unique($targets));
+    }
+
+    private static function fileRelative(string $projectRoot, string $path): ?string
+    {
+        $real = @realpath($path);
+
+        if ($real === false) {
+            $real = $path;
+        }
+
+        $root = rtrim($projectRoot, DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR;
+
+        if (! str_starts_with($real, $root)) {
+            return null;
+        }
+
+        return str_replace(DIRECTORY_SEPARATOR, '/', substr($real, strlen($root)));
+    }
+}

src/Plugins/Tia/WatchDefaults/Inertia.php

@@ -0,0 +1,46 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia\WatchDefaults;
+
+use Composer\InstalledVersions;
+
+/**
+ * @internal
+ */
+final readonly class Inertia implements WatchDefault
+{
+    public function applicable(): bool
+    {
+        return class_exists(InstalledVersions::class)
+            && (InstalledVersions::isInstalled('inertiajs/inertia-laravel')
+                || InstalledVersions::isInstalled('rompetomp/inertia-bundle'));
+    }
+
+    public function defaults(string $projectRoot, string $testPath): array
+    {
+        $browserTargets = Browser::detectBrowserTestTargets($projectRoot, $testPath);
+
+        $patterns = [];
+
+        foreach (['Pages', 'pages'] as $pages) {
+            foreach (['vue', 'tsx', 'jsx', 'svelte', 'ts', 'js'] as $ext) {
+                $patterns["resources/js/{$pages}/**/*.{$ext}"] = $browserTargets;
+            }
+        }
+
+        foreach (['Layouts', 'layouts', 'Components', 'components'] as $shared) {
+            foreach (['vue', 'tsx', 'ts', 'js'] as $ext) {
+                $patterns["resources/js/{$shared}/**/*.{$ext}"] = $browserTargets;
+            }
+        }
+
+        $patterns['resources/js/ssr.js'] = $browserTargets;
+        $patterns['resources/js/ssr.ts'] = $browserTargets;
+        $patterns['resources/js/app.js'] = $browserTargets;
+        $patterns['resources/js/app.ts'] = $browserTargets;
+
+        return $patterns;
+    }
+}

src/Plugins/Tia/WatchDefaults/Laravel.php

@@ -0,0 +1,65 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia\WatchDefaults;
+
+use Composer\InstalledVersions;
+
+/**
+ * @internal
+ */
+final readonly class Laravel implements WatchDefault
+{
+    public function applicable(): bool
+    {
+        return class_exists(InstalledVersions::class)
+            && InstalledVersions::isInstalled('laravel/framework');
+    }
+
+    public function defaults(string $projectRoot, string $testPath): array
+    {
+        return [
+            'config/*.php' => [$testPath],
+            'config/**/*.php' => [$testPath],
+
+            'routes/*.php' => [$testPath],
+            'routes/**/*.php' => [$testPath],
+
+            'bootstrap/app.php' => [$testPath],
+            'bootstrap/providers.php' => [$testPath],
+
+            'database/migrations/**/*.php' => [$testPath],
+
+            'database/seeders/**/*.php' => [$testPath],
+
+            'database/factories/**/*.php' => [$testPath],
+
+            'storage/fixtures/**/*' => [$testPath],
+
+            'app/**/*.tpl' => [$testPath],
+            'app/**/*.stub' => [$testPath],
+            'app/**/*.json' => [$testPath],
+            'app/**/*.yaml' => [$testPath],
+            'app/**/*.yml' => [$testPath],
+            'app/**/*.txt' => [$testPath],
+
+            'resources/views/**/*.blade.php' => [$testPath],
+            'resources/views/**/*.css' => [$testPath],
+            'resources/views/email/**/*.blade.php' => [$testPath],
+            'resources/views/emails/**/*.blade.php' => [$testPath],
+
+            'lang/**/*.php' => [$testPath],
+            'lang/**/*.json' => [$testPath],
+            'resources/lang/**/*.php' => [$testPath],
+            'resources/lang/**/*.json' => [$testPath],
+
+            'vite.config.js' => [$testPath],
+            'vite.config.ts' => [$testPath],
+            'webpack.mix.js' => [$testPath],
+            'tailwind.config.js' => [$testPath],
+            'tailwind.config.ts' => [$testPath],
+            'postcss.config.js' => [$testPath],
+        ];
+    }
+}

src/Plugins/Tia/WatchDefaults/Livewire.php

@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia\WatchDefaults;
+
+use Composer\InstalledVersions;
+
+/**
+ * @internal
+ */
+final readonly class Livewire implements WatchDefault
+{
+    public function applicable(): bool
+    {
+        return class_exists(InstalledVersions::class)
+            && InstalledVersions::isInstalled('livewire/livewire');
+    }
+
+    public function defaults(string $projectRoot, string $testPath): array
+    {
+        return [
+            'resources/views/livewire/**/*.blade.php' => [$testPath],
+            'resources/views/components/**/*.blade.php' => [$testPath],
+            'resources/views/pages/**/*.blade.php' => [$testPath],
+
+            'resources/js/**/*.js' => [$testPath],
+            'resources/js/**/*.ts' => [$testPath],
+        ];
+    }
+}

src/Plugins/Tia/WatchDefaults/Php.php

@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia\WatchDefaults;
+
+/**
+ * @internal
+ */
+final readonly class Php implements WatchDefault
+{
+    public function applicable(): bool
+    {
+        return true;
+    }
+
+    public function defaults(string $projectRoot, string $testPath): array
+    {
+        return [
+            '.env' => [$testPath],
+            '.env.testing' => [$testPath],
+            '.env.local' => [$testPath],
+            '.env.*.local' => [$testPath],
+
+            'docker-compose.yml' => [$testPath],
+            'docker-compose.yaml' => [$testPath],
+
+            'phpunit.xml.dist' => [$testPath],
+
+            $testPath.'/Pest.php' => [$testPath],
+
+            $testPath.'/Datasets/**/*.php' => [$testPath],
+
+            $testPath.'/Fixtures/**/*' => [$testPath],
+            $testPath.'/**/Fixtures/**/*' => [$testPath],
+
+            $testPath.'/.pest/snapshots/**/*.snap' => [$testPath],
+        ];
+    }
+}

src/Plugins/Tia/WatchDefaults/Symfony.php

@@ -0,0 +1,62 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia\WatchDefaults;
+
+use Composer\InstalledVersions;
+
+/**
+ * @internal
+ */
+final readonly class Symfony implements WatchDefault
+{
+    public function applicable(): bool
+    {
+        return class_exists(InstalledVersions::class)
+            && InstalledVersions::isInstalled('symfony/framework-bundle');
+    }
+
+    public function defaults(string $projectRoot, string $testPath): array
+    {
+        return [
+            'config/*.yaml' => [$testPath],
+            'config/*.yml' => [$testPath],
+            'config/*.php' => [$testPath],
+            'config/*.xml' => [$testPath],
+            'config/**/*.yaml' => [$testPath],
+            'config/**/*.yml' => [$testPath],
+            'config/**/*.php' => [$testPath],
+            'config/**/*.xml' => [$testPath],
+
+            'config/routes/*.yaml' => [$testPath],
+            'config/routes/*.php' => [$testPath],
+            'config/routes/*.xml' => [$testPath],
+            'config/routes/**/*.yaml' => [$testPath],
+
+            'src/Kernel.php' => [$testPath],
+
+            'migrations/**/*.php' => [$testPath],
+            'src/Migrations/**/*.php' => [$testPath],
+
+            'templates/**/*.html.twig' => [$testPath],
+            'templates/**/*.twig' => [$testPath],
+
+            'translations/**/*.yaml' => [$testPath],
+            'translations/**/*.yml' => [$testPath],
+            'translations/**/*.xlf' => [$testPath],
+            'translations/**/*.xliff' => [$testPath],
+
+            'config/doctrine/**/*.xml' => [$testPath],
+            'config/doctrine/**/*.yaml' => [$testPath],
+
+            'webpack.config.js' => [$testPath],
+            'importmap.php' => [$testPath],
+            'assets/**/*.js' => [$testPath],
+            'assets/**/*.ts' => [$testPath],
+            'assets/**/*.vue' => [$testPath],
+            'assets/**/*.css' => [$testPath],
+            'assets/**/*.scss' => [$testPath],
+        ];
+    }
+}

src/Plugins/Tia/WatchDefaults/WatchDefault.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia\WatchDefaults;
+
+/**
+ * @internal
+ */
+interface WatchDefault
+{
+    public function applicable(): bool;
+
+    /**
+     * @return array<string, array<int, string>> glob → list of project-relative test dirs
+     */
+    public function defaults(string $projectRoot, string $testPath): array;
+}

src/Plugins/Tia/WatchPatterns.php

@@ -0,0 +1,200 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins\Tia;
+
+use Pest\Plugins\Tia\WatchDefaults\WatchDefault;
+use Pest\TestSuite;
+
+/**
+ * @internal
+ */
+final class WatchPatterns
+{
+    /**
+     * @var array<int, class-string<WatchDefault>>
+     */
+    private const array DEFAULTS = [
+        WatchDefaults\Php::class,
+        WatchDefaults\Laravel::class,
+        WatchDefaults\Symfony::class,
+        WatchDefaults\Livewire::class,
+        WatchDefaults\Inertia::class,
+        WatchDefaults\Browser::class,
+    ];
+
+    /**
+     * @var array<string, array<int, string>> glob → list of project-relative test dirs/files
+     */
+    private array $patterns = [];
+
+    private bool $enabled = false;
+
+    private bool $locally = false;
+
+    private bool $filtered = false;
+
+    public function useDefaults(string $projectRoot): void
+    {
+        $testPath = TestSuite::getInstance()->testPath;
+
+        foreach (self::DEFAULTS as $class) {
+            $default = new $class;
+
+            if (! $default->applicable()) {
+                continue;
+            }
+
+            foreach ($default->defaults($projectRoot, $testPath) as $glob => $dirs) {
+                $this->patterns[$glob] = array_values(array_unique(
+                    array_merge($this->patterns[$glob] ?? [], $dirs),
+                ));
+            }
+        }
+    }
+
+    /**
+     * @param  array<string, string>  $patterns  glob → project-relative test dir/file
+     */
+    public function add(array $patterns): void
+    {
+        foreach ($patterns as $glob => $dir) {
+            $this->patterns[$glob] = array_values(array_unique(
+                array_merge($this->patterns[$glob] ?? [], [$dir]),
+            ));
+        }
+    }
+
+    /**
+     * @param  string  $projectRoot  Absolute path.
+     * @param  array<int, string>  $changedFiles  Project-relative paths.
+     * @return array<int, string> Project-relative test dirs/files.
+     */
+    public function matchedDirectories(string $projectRoot, array $changedFiles): array
+    {
+        if ($this->patterns === []) {
+            return [];
+        }
+
+        $matched = [];
+
+        foreach ($changedFiles as $file) {
+            foreach ($this->patterns as $glob => $dirs) {
+                if ($this->globMatches($glob, $file)) {
+                    foreach ($dirs as $dir) {
+                        $matched[$dir] = true;
+                    }
+                }
+            }
+        }
+
+        return array_keys($matched);
+    }
+
+    /**
+     * @param  array<int, string>  $directories  Project-relative dirs/files.
+     * @param  array<int, string>  $allTestFiles  Project-relative test files from graph.
+     * @return array<int, string>
+     */
+    public function testsUnderDirectories(array $directories, array $allTestFiles): array
+    {
+        if ($directories === []) {
+            return [];
+        }
+
+        $affected = [];
+
+        foreach ($allTestFiles as $testFile) {
+            foreach ($directories as $target) {
+                if ($testFile === $target) {
+                    $affected[] = $testFile;
+
+                    break;
+                }
+
+                $prefix = rtrim($target, '/').'/';
+
+                if (str_starts_with($testFile, $prefix)) {
+                    $affected[] = $testFile;
+
+                    break;
+                }
+            }
+        }
+
+        return $affected;
+    }
+
+    public function markEnabled(): void
+    {
+        $this->enabled = true;
+    }
+
+    public function isEnabled(): bool
+    {
+        return $this->enabled;
+    }
+
+    public function markLocally(): void
+    {
+        $this->locally = true;
+    }
+
+    public function isLocally(): bool
+    {
+        return $this->locally;
+    }
+
+    public function markFiltered(): void
+    {
+        $this->filtered = true;
+    }
+
+    public function isFiltered(): bool
+    {
+        return $this->filtered;
+    }
+
+    public function reset(): void
+    {
+        $this->patterns = [];
+        $this->enabled = false;
+        $this->locally = false;
+        $this->filtered = false;
+    }
+
+    private function globMatches(string $pattern, string $file): bool
+    {
+        $pattern = str_replace('\\', '/', $pattern);
+        $file = str_replace('\\', '/', $file);
+
+        $regex = '';
+        $len = strlen($pattern);
+        $i = 0;
+
+        while ($i < $len) {
+            $c = $pattern[$i];
+
+            if ($c === '*' && isset($pattern[$i + 1]) && $pattern[$i + 1] === '*') {
+                $regex .= '.*';
+                $i += 2;
+
+                if (isset($pattern[$i]) && $pattern[$i] === '/') {
+                    $i++;
+                }
+            } elseif ($c === '*') {
+                $regex .= '[^/]*';
+                $i++;
+            } elseif ($c === '?') {
+                $regex .= '[^/]';
+                $i++;
+            } else {
+                $regex .= preg_quote($c, '#');
+                $i++;
+            }
+        }
+
+        return (bool) preg_match('#^'.$regex.'$#', $file);
+    }
+}

src/Repositories/SnapshotRepository.php

@@ -59,8 +59,10 @@ final class SnapshotRepository
     {
         $snapshotFilename = $this->getSnapshotFilename();
 
-        if (! file_exists(dirname($snapshotFilename))) {
-            mkdir(dirname($snapshotFilename), 0755, true);
+        $directory = dirname($snapshotFilename);
+
+        if (! is_dir($directory)) {
+            @mkdir($directory, 0755, true);
         }
 
         file_put_contents($snapshotFilename, $snapshot);

src/Restarters/PcovRestarter.php

@@ -0,0 +1,92 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Restarters;
+
+use Pest\Contracts\Restarter;
+use Pest\Plugins\Tia;
+
+/**
+ * @internal
+ */
+final class PcovRestarter implements Restarter
+{
+    private const string ENV_RESTARTED = 'PEST_PCOV_RESTARTER_RESTARTED';
+
+    /**
+     * @param  array<int, string>  $arguments
+     */
+    public function maybeRestart(string $projectRoot, array $arguments): void
+    {
+        if (! extension_loaded('pcov')) {
+            return;
+        }
+
+        if (getenv(self::ENV_RESTARTED) === '1') {
+            return;
+        }
+
+        if (! Tia::isEnabledForRun($arguments)) {
+            return;
+        }
+
+        $desired = $this->normalise($projectRoot);
+        $current = $this->normalise((string) ini_get('pcov.directory'));
+
+        if ($current === $desired) {
+            return;
+        }
+
+        $this->restart($projectRoot, $arguments);
+    }
+
+    /**
+     * @param  array<int, string>  $arguments
+     */
+    private function restart(string $projectRoot, array $arguments): void
+    {
+        $env = $this->inheritEnv();
+        $env[self::ENV_RESTARTED] = '1';
+
+        $command = array_merge(
+            [PHP_BINARY, '-d', 'pcov.directory='.$projectRoot],
+            array_values($arguments),
+        );
+
+        $proc = @proc_open(
+            $command,
+            [STDIN, STDOUT, STDERR],
+            $pipes,
+            null,
+            $env,
+        );
+
+        if (! is_resource($proc)) {
+            return;
+        }
+
+        $exitCode = proc_close($proc);
+
+        exit($exitCode === -1 ? 1 : $exitCode);
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    private function inheritEnv(): array
+    {
+        $env = [];
+
+        foreach (getenv() as $name => $value) {
+            $env[$name] = $value;
+        }
+
+        return $env;
+    }
+
+    private function normalise(string $path): string
+    {
+        return rtrim($path, '/\\');
+    }
+}

src/Restarters/XdebugRestarter.php

@@ -0,0 +1,113 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Restarters;
+
+use Composer\XdebugHandler\XdebugHandler;
+use Pest\Contracts\Restarter;
+use Pest\Plugins\Tia;
+use Pest\Plugins\Tia\Fingerprint;
+use Pest\Plugins\Tia\Graph;
+use Pest\Plugins\Tia\Storage;
+
+/**
+ * @internal
+ */
+final class XdebugRestarter implements Restarter
+{
+    /**
+     * @param  array<int, string>  $arguments
+     */
+    public function maybeRestart(string $projectRoot, array $arguments): void
+    {
+        if (! class_exists(XdebugHandler::class)) {
+            return;
+        }
+
+        if (! extension_loaded('xdebug')) {
+            return;
+        }
+
+        if (! $this->xdebugIsCoverageOnly()) {
+            return;
+        }
+
+        if (! $this->runLooksDroppable($arguments, $projectRoot)) {
+            return;
+        }
+
+        (new XdebugHandler('pest'))->check();
+    }
+
+    private function xdebugIsCoverageOnly(): bool
+    {
+        if (! function_exists('xdebug_info')) {
+            return false;
+        }
+
+        $modes = @xdebug_info('mode');
+
+        if (! is_array($modes)) {
+            return false;
+        }
+
+        $modes = array_values(array_filter($modes, is_string(...)));
+
+        if ($modes === []) {
+            return true;
+        }
+
+        return $modes === ['coverage'];
+    }
+
+    /**
+     * @param  array<int, string>  $arguments
+     */
+    private function runLooksDroppable(array $arguments, string $projectRoot): bool
+    {
+        foreach ($arguments as $value) {
+            if ($value === '--coverage'
+                || str_starts_with($value, '--coverage=')
+                || str_starts_with($value, '--coverage-')) {
+                return false;
+            }
+
+            if ($value === '--fresh') {
+                return false;
+            }
+        }
+
+        if (! Tia::isEnabledForRun($arguments)) {
+            return false;
+        }
+
+        return $this->tiaWillReplay($projectRoot);
+    }
+
+    private function tiaWillReplay(string $projectRoot): bool
+    {
+        $path = Storage::tempDir($projectRoot).DIRECTORY_SEPARATOR.Tia::KEY_GRAPH;
+
+        if (! is_file($path)) {
+            return false;
+        }
+
+        $json = @file_get_contents($path);
+
+        if ($json === false) {
+            return false;
+        }
+
+        $graph = Graph::decode($json, $projectRoot);
+
+        if (! $graph instanceof Graph) {
+            return false;
+        }
+
+        return Fingerprint::structuralMatches(
+            $graph->fingerprint(),
+            Fingerprint::compute($projectRoot),
+        );
+    }
+}

src/Subscribers/EnsureTiaAssertionsAreRecordedOnFinished.php

@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Subscribers;
+
+use Pest\Plugins\Tia\ResultCollector;
+use PHPUnit\Event\Code\TestMethod;
+use PHPUnit\Event\Test\Finished;
+use PHPUnit\Event\Test\FinishedSubscriber;
+
+/**
+ * @internal
+ */
+final readonly class EnsureTiaAssertionsAreRecordedOnFinished implements FinishedSubscriber
+{
+    public function __construct(private ResultCollector $collector) {}
+
+    public function notify(Finished $event): void
+    {
+        $test = $event->test();
+
+        if ($test instanceof TestMethod) {
+            $this->collector->recordAssertions(
+                $test->className().'::'.$test->methodName(),
+                $event->numberOfAssertionsPerformed(),
+            );
+        }
+
+        $this->collector->finishTest();
+    }
+}

src/Subscribers/EnsureTiaCoverageIsFlushed.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Subscribers;
+
+use Pest\Plugins\Tia\Recorder;
+use PHPUnit\Event\Test\Finished;
+use PHPUnit\Event\Test\FinishedSubscriber;
+
+/**
+ * @internal
+ */
+final readonly class EnsureTiaCoverageIsFlushed implements FinishedSubscriber
+{
+    public function __construct(private Recorder $recorder) {}
+
+    public function notify(Finished $event): void
+    {
+        $this->recorder->endTest();
+    }
+}

src/Subscribers/EnsureTiaCoverageIsRecorded.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Subscribers;
+
+use Pest\Plugins\Tia\Recorder;
+use PHPUnit\Event\Code\TestMethod;
+use PHPUnit\Event\Test\Prepared;
+use PHPUnit\Event\Test\PreparedSubscriber;
+
+/**
+ * @internal
+ */
+final readonly class EnsureTiaCoverageIsRecorded implements PreparedSubscriber
+{
+    public function __construct(private Recorder $recorder) {}
+
+    public function notify(Prepared $event): void
+    {
+        if (! $this->recorder->isActive()) {
+            return;
+        }
+
+        $test = $event->test();
+
+        if (! $test instanceof TestMethod) {
+            return;
+        }
+
+        $this->recorder->beginTest($test->className(), $test->methodName(), $test->file());
+    }
+}

src/Subscribers/EnsureTiaIsRunningPestTestsOnly.php

@@ -0,0 +1,64 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Subscribers;
+
+use Pest\Concerns\Testable;
+use Pest\Exceptions\TiaRequiresPestTests;
+use Pest\Panic;
+use Pest\Plugins\Tia\Recorder;
+use PHPUnit\Event\Code\TestMethod;
+use PHPUnit\Event\Test\Prepared;
+use PHPUnit\Event\Test\PreparedSubscriber;
+use ReflectionClass;
+
+/**
+ * @internal
+ */
+final readonly class EnsureTiaIsRunningPestTestsOnly implements PreparedSubscriber
+{
+    public function __construct(private Recorder $recorder) {}
+
+    public function notify(Prepared $event): void
+    {
+        if (! $this->recorder->isActive()) {
+            return;
+        }
+
+        $test = $event->test();
+
+        if (! $test instanceof TestMethod) {
+            return;
+        }
+
+        $className = $test->className();
+
+        if (! class_exists($className, false)) {
+            return;
+        }
+
+        if ($this->usesTestableTrait($className)) {
+            return;
+        }
+
+        Panic::with(new TiaRequiresPestTests($className, $test->file()));
+    }
+
+    private function usesTestableTrait(string $className): bool
+    {
+        $reflection = new ReflectionClass($className);
+
+        do {
+            foreach ($reflection->getTraitNames() as $trait) {
+                if ($trait === Testable::class) {
+                    return true;
+                }
+            }
+
+            $reflection = $reflection->getParentClass();
+        } while ($reflection !== false);
+
+        return false;
+    }
+}

src/Subscribers/EnsureTiaResultIsRecordedOnErrored.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Subscribers;
+
+use Pest\Plugins\Tia\ResultCollector;
+use PHPUnit\Event\Test\Errored;
+use PHPUnit\Event\Test\ErroredSubscriber;
+
+/**
+ * @internal
+ */
+final readonly class EnsureTiaResultIsRecordedOnErrored implements ErroredSubscriber
+{
+    public function __construct(private ResultCollector $collector) {}
+
+    public function notify(Errored $event): void
+    {
+        $this->collector->testErrored($event->throwable()->message());
+    }
+}

src/Subscribers/EnsureTiaResultIsRecordedOnFailed.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Subscribers;
+
+use Pest\Plugins\Tia\ResultCollector;
+use PHPUnit\Event\Test\Failed;
+use PHPUnit\Event\Test\FailedSubscriber;
+
+/**
+ * @internal
+ */
+final readonly class EnsureTiaResultIsRecordedOnFailed implements FailedSubscriber
+{
+    public function __construct(private ResultCollector $collector) {}
+
+    public function notify(Failed $event): void
+    {
+        $this->collector->testFailed($event->throwable()->message());
+    }
+}

src/Subscribers/EnsureTiaResultIsRecordedOnIncomplete.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Subscribers;
+
+use Pest\Plugins\Tia\ResultCollector;
+use PHPUnit\Event\Test\MarkedIncomplete;
+use PHPUnit\Event\Test\MarkedIncompleteSubscriber;
+
+/**
+ * @internal
+ */
+final readonly class EnsureTiaResultIsRecordedOnIncomplete implements MarkedIncompleteSubscriber
+{
+    public function __construct(private ResultCollector $collector) {}
+
+    public function notify(MarkedIncomplete $event): void
+    {
+        $this->collector->testIncomplete($event->throwable()->message());
+    }
+}

src/Subscribers/EnsureTiaResultIsRecordedOnPassed.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Subscribers;
+
+use Pest\Plugins\Tia\ResultCollector;
+use PHPUnit\Event\Test\Passed;
+use PHPUnit\Event\Test\PassedSubscriber;
+
+/**
+ * @internal
+ */
+final readonly class EnsureTiaResultIsRecordedOnPassed implements PassedSubscriber
+{
+    public function __construct(private ResultCollector $collector) {}
+
+    public function notify(Passed $event): void
+    {
+        $this->collector->testPassed();
+    }
+}

src/Subscribers/EnsureTiaResultIsRecordedOnRisky.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Subscribers;
+
+use Pest\Plugins\Tia\ResultCollector;
+use PHPUnit\Event\Test\ConsideredRisky;
+use PHPUnit\Event\Test\ConsideredRiskySubscriber;
+
+/**
+ * @internal
+ */
+final readonly class EnsureTiaResultIsRecordedOnRisky implements ConsideredRiskySubscriber
+{
+    public function __construct(private ResultCollector $collector) {}
+
+    public function notify(ConsideredRisky $event): void
+    {
+        $this->collector->testRisky($event->message());
+    }
+}

src/Subscribers/EnsureTiaResultIsRecordedOnSkipped.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Subscribers;
+
+use Pest\Plugins\Tia\ResultCollector;
+use PHPUnit\Event\Test\Skipped;
+use PHPUnit\Event\Test\SkippedSubscriber;
+
+/**
+ * @internal
+ */
+final readonly class EnsureTiaResultIsRecordedOnSkipped implements SkippedSubscriber
+{
+    public function __construct(private ResultCollector $collector) {}
+
+    public function notify(Skipped $event): void
+    {
+        $this->collector->testSkipped($event->message());
+    }
+}

src/Subscribers/EnsureTiaResultsAreCollected.php

@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Subscribers;
+
+use Pest\Plugins\Tia\ResultCollector;
+use PHPUnit\Event\Code\TestMethod;
+use PHPUnit\Event\Test\Prepared;
+use PHPUnit\Event\Test\PreparedSubscriber;
+
+/**
+ * @internal
+ */
+final readonly class EnsureTiaResultsAreCollected implements PreparedSubscriber
+{
+    public function __construct(private ResultCollector $collector) {}
+
+    public function notify(Prepared $event): void
+    {
+        $test = $event->test();
+
+        if ($test instanceof TestMethod) {
+            $this->collector->testPrepared($test->className().'::'.$test->methodName(), $test->file());
+        }
+    }
+}

src/Support/Coverage.php

@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace Pest\Support;
 
 use Pest\Exceptions\ShouldNotHappen;
+use Pest\Plugins\Tia\CoverageMerger;
 use SebastianBergmann\CodeCoverage\CodeCoverage;
 use SebastianBergmann\CodeCoverage\Node\Directory;
 use SebastianBergmann\CodeCoverage\Node\File;
@@ -88,6 +89,12 @@ final class Coverage
             throw ShouldNotHappen::fromMessage(sprintf('Coverage not found in path: %s.', $reportPath));
         }
 
+        // If TIA's marker is present, this run executed only the affected
+        // tests. Merge their fresh coverage slice into the cached full-run
+        // snapshot (stored by the previous `--tia --coverage` pass) so the
+        // report reflects the entire suite, not just what re-ran.
+        CoverageMerger::applyIfMarked($reportPath);
+
         /** @var CodeCoverage $codeCoverage */
         $codeCoverage = require $reportPath;
         unlink($reportPath);

src/Support/Cpu.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Support;
+
+use Fidry\CpuCoreCounter\CpuCoreCounter;
+
+/**
+ * @internal
+ */
+final class Cpu
+{
+    public static function cores(int $fallback = 4): int
+    {
+        return (new CpuCoreCounter)->getCountWithFallback($fallback);
+    }
+}

src/Support/StateGenerator.php

@@ -11,6 +11,7 @@ use PHPUnit\Event\Code\TestDoxBuilder;
 use PHPUnit\Event\Code\TestMethod;
 use PHPUnit\Event\Code\ThrowableBuilder;
 use PHPUnit\Event\Test\Errored;
+use PHPUnit\Event\Test\Failed;
 use PHPUnit\Event\Test\PhpunitDeprecationTriggered;
 use PHPUnit\Event\Test\PhpunitErrorTriggered;
 use PHPUnit\Event\Test\PhpunitNoticeTriggered;
@@ -40,11 +41,16 @@ final class StateGenerator
         }
 
         foreach ($testResult->testFailedEvents() as $testResultEvent) {
-            $state->add(TestResult::fromPestParallelTestCase(
-                $testResultEvent->test(),
-                TestResult::FAIL,
-                $testResultEvent->throwable()
-            ));
+            if ($testResultEvent instanceof Failed) {
+                $state->add(TestResult::fromPestParallelTestCase(
+                    $testResultEvent->test(),
+                    TestResult::FAIL,
+                    $testResultEvent->throwable()
+                ));
+            } else {
+                // @phpstan-ignore-next-line
+                $state->add(TestResult::fromBeforeFirstTestMethodErrored($testResultEvent));
+            }
         }
 
         $this->addTriggeredPhpunitEvents($state, $testResult->testTriggeredPhpunitErrorEvents(), TestResult::FAIL);

src/TestCaseFilters/TiaTestCaseFilter.php

@@ -0,0 +1,55 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\TestCaseFilters;
+
+use Pest\Contracts\TestCaseFilter;
+use Pest\Plugins\Tia\Graph;
+
+/**
+ * @internal
+ */
+final readonly class TiaTestCaseFilter implements TestCaseFilter
+{
+    /**
+     * @param  array<string, true>  $affectedTestFiles  Keys are project-relative test file paths.
+     */
+    public function __construct(
+        private string $projectRoot,
+        private Graph $graph,
+        private array $affectedTestFiles,
+    ) {}
+
+    public function accept(string $testCaseFilename): bool
+    {
+        $rel = $this->relative($testCaseFilename);
+
+        if ($rel === null) {
+            return true;
+        }
+
+        if (! $this->graph->knowsTest($rel)) {
+            return true;
+        }
+
+        return isset($this->affectedTestFiles[$rel]);
+    }
+
+    private function relative(string $path): ?string
+    {
+        $real = @realpath($path);
+
+        if ($real === false) {
+            $real = $path;
+        }
+
+        $root = rtrim($this->projectRoot, DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR;
+
+        if (! str_starts_with($real, $root)) {
+            return null;
+        }
+
+        return str_replace(DIRECTORY_SEPARATOR, '/', substr($real, strlen($root)));
+    }
+}

tests/.pest/snapshots/Features/Expect/toMatchSnapshot/failures.snap

@@ -1,7 +0,0 @@
-    <div class="container">
-        <div class="row">
-            <div class="col-md-12">
-                <h1>Snapshot</h1>
-            </div>
-        </div>
-    </div>

tests/.pest/snapshots/Features/Expect/toMatchSnapshot/failures_with_custom_message.snap

@@ -1,7 +0,0 @@
-    <div class="container">
-        <div class="row">
-            <div class="col-md-12">
-                <h1>Snapshot</h1>
-            </div>
-        </div>
-    </div>

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

@@ -1,5 +1,5 @@
 
-  Pest Testing Framework 4.6.0.  
+  Pest Testing Framework 4.6.3.  
 
   USAGE: pest <file> [options]  
 
@@ -91,7 +91,11 @@
   --cache-result ............................ Write test results to cache file  
   --do-not-cache-result .............. Do not write test results to cache file  
   --order-by [order]  Run tests in order: default|defects|depends|duration|no-depends|random|reverse|size  
+  --resolve-dependencies ...................... Alias for "--order-by depends"  
+  --ignore-dependencies .................... Alias for "--order-by no-depends"  
+  --random-order ............................... Alias for "--order-by random"  
   --random-order-seed [N]  Use the specified random seed when running tests in random order  
+  --reverse-order ............................. Alias for "--order-by reverse"  
 
   REPORTING OPTIONS:
   --colors=[flag] ......... Use colors in output ("never", "auto" or "always")  

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

@@ -1,3 +1,3 @@
 
-  Pest Testing Framework 4.6.0.  
+  Pest Testing Framework 4.6.3.  
 

tests/.snapshots/success.txt

@@ -1,7 +1,7 @@
 
    PASS  Tests\Arch
   ✓ preset → php → ignoring ['Pest\Expectation', 'debug_backtrace', 'var_export', …]
-  ✓ preset → strict → ignoring ['usleep']
+  ✓ preset → strict → ignoring ['Pest\Plugins\Tia\BaselineSync', 'usleep']
   ✓ preset → security → ignoring ['eval', 'str_shuffle', 'exec', …]
   ✓ globals
   ✓ contracts
@@ -1037,8 +1037,6 @@
   ✓ pass with toArray
   ✓ pass with array
   ✓ pass with toSnapshot
-  ✓ failures
-  ✓ failures with custom message
   ✓ not failures
   ✓ multiple snapshot expectations
   ✓ multiple snapshot expectations with datasets with (1)
@@ -1903,4 +1901,4 @@
   ✓ pass with dataset with ('my-datas-set-value')
   ✓ within describe → pass with dataset with ('my-datas-set-value')
 
-  Tests:    2 deprecated, 4 warnings, 5 incomplete, 2 notices, 40 todos, 35 skipped, 1296 passed (2977 assertions)
+  Tests:    2 deprecated, 4 warnings, 5 incomplete, 2 notices, 40 todos, 35 skipped, 1294 passed (2971 assertions)

tests/Arch.php

@@ -1,15 +1,20 @@
 <?php
 
 use Pest\Expectation;
+use Pest\Plugins\Tia\BaselineSync;
 
 arch()->preset()->php()->ignoring([
     Expectation::class,
     'debug_backtrace',
     'var_export',
     'xdebug_info',
+    'xdebug_start_code_coverage',
+    'xdebug_stop_code_coverage',
+    'xdebug_get_code_coverage',
 ]);
 
 arch()->preset()->strict()->ignoring([
+    BaselineSync::class,
     'usleep',
 ]);
 

tests/Features/Expect/toMatchSnapshot.php

@@ -134,18 +134,6 @@ test('pass with `toSnapshot`', function () {
     expect($object)->toMatchSnapshot();
 });
 
-test('failures', function () {
-    TestSuite::getInstance()->snapshots->save($this->snapshotable);
-
-    expect('contain that does not match snapshot')->toMatchSnapshot();
-})->throws(ExpectationFailedException::class, 'Failed asserting that two strings are identical.');
-
-test('failures with custom message', function () {
-    TestSuite::getInstance()->snapshots->save($this->snapshotable);
-
-    expect('contain that does not match snapshot')->toMatchSnapshot('oh no');
-})->throws(ExpectationFailedException::class, 'oh no');
-
 test('not failures', function () {
     TestSuite::getInstance()->snapshots->save($this->snapshotable);
 

tests/Pest.php

@@ -86,5 +86,12 @@ dataset('dataset_in_pest_file', ['A', 'B']);
 
 function removeAnsiEscapeSequences(string $input): ?string
 {
-    return preg_replace('#\\x1b[[][^A-Za-z]*[A-Za-z]#', '', $input);
+    return preg_replace(
+        [
+            '#\\x1b[[][^A-Za-z]*[A-Za-z]#',       // CSI (colors, cursor, etc.)
+            '#\\x1b\\]8;[^\\x1b\\x07]*(?:\\x1b\\\\|\\x07)#', // OSC 8 hyperlinks
+        ],
+        '',
+        $input,
+    );
 }

tests/Visual/Parallel.php

@@ -23,13 +23,13 @@ test('parallel', function () use ($run) {
         $file = file_get_contents(__FILE__);
         $file = preg_replace(
             '/\$expected = \'.*?\';/',
-            "\$expected = '2 deprecated, 4 warnings, 5 incomplete, 3 notices, 40 todos, 27 skipped, 1280 passed (2926 assertions)';",
+            "\$expected = '2 deprecated, 4 warnings, 5 incomplete, 3 notices, 40 todos, 27 skipped, 1278 passed (2920 assertions)';",
             $file,
         );
         file_put_contents(__FILE__, $file);
     }
 
-    $expected = '2 deprecated, 4 warnings, 5 incomplete, 3 notices, 40 todos, 27 skipped, 1280 passed (2926 assertions)';
+    $expected = '2 deprecated, 4 warnings, 5 incomplete, 3 notices, 40 todos, 27 skipped, 1278 passed (2920 assertions)';
 
     expect($output)
         ->toContain("Tests:    {$expected}")

tests/Visual/Success.php

@@ -21,8 +21,10 @@ test('visual snapshot of test suite on success', function () {
 
         return preg_replace([
             '#\\x1b[[][^A-Za-z]*[A-Za-z]#',
+            '#\\x1b\\]8;[^\\x1b\\x07]*(?:\\x1b\\\\|\\x07)#',
             '/(Tests\\\PHPUnit\\\CustomAffixes\\\InvalidTestName)([A-Za-z0-9]*)/',
         ], [
+            '',
             '',
             '$1',
         ], $process->getOutput());