Adds initial implementation of --dirty option.

bin/pest

@@ -3,8 +3,10 @@
 
 use Pest\Actions\ValidatesEnvironment;
 use Pest\ConfigLoader;
+use Pest\Repositories\TestRepository;
 use Pest\Support\Container;
 use Pest\Kernel;
+use Pest\Support\DirtyTestCaseFilter;
 use Pest\TestSuite;
 use Symfony\Component\Console\Input\ArgvInput;
 use Symfony\Component\Console\Output\ConsoleOutput;
@@ -44,9 +46,18 @@ use Symfony\Component\Console\Output\OutputInterface;
     $rootPath = dirname($autoloadPath, 2);
     $argv = new ArgvInput();
 
+    $filters = [];
+
+    foreach ($args as $key => $value) {
+        if (str_contains($value, '--dirty')) {
+            $filters[] = new DirtyTestCaseFilter($rootPath);
+        }
+    }
+
     $testSuite = TestSuite::getInstance(
         $rootPath,
-        $argv->getParameterOption('--test-directory', (new ConfigLoader($rootPath))->getTestsDirectory())
+        $argv->getParameterOption('--test-directory', (new ConfigLoader($rootPath))->getTestsDirectory()),
+        new TestRepository($filters),
     );
 
     $isDecorated = $argv->getParameterOption('--colors', 'always') !== 'never';
@@ -57,16 +68,10 @@ use Symfony\Component\Console\Output\OutputInterface;
     $container->add(TestSuite::class, $testSuite);
     $container->add(OutputInterface::class, $output);
 
+    $argsToUnset = ['--test-directory', '--compact', '--profile', '--dirty'];
+
     foreach ($args as $key => $value) {
-        if (str_contains($value, '--test-directory')) {
+        if (in_array($value, $argsToUnset)) {
-            unset($args[$key]);
-        }
-
-        if (str_contains($value, '--compact')) {
-            unset($args[$key]);
-        }
-
-        if (str_contains($value, '--profile')) {
             unset($args[$key]);
         }
     }

src/Contracts/TestCaseFilter.php

@@ -0,0 +1,10 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Contracts;
+
+interface TestCaseFilter
+{
+    public function canLoad(string $suiteClassFile): bool;
+}

src/Repositories/TestRepository.php

@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace Pest\Repositories;
 
 use Closure;
+use Pest\Contracts\TestCaseFilter;
 use Pest\Exceptions\TestCaseAlreadyInUse;
 use Pest\Exceptions\TestCaseClassOrTraitNotFound;
 use Pest\Factories\TestCaseFactory;
@@ -27,6 +28,13 @@ final class TestRepository
      */
     private array $uses = [];
 
+    /**
+     * @param array<int, TestCaseFilter> $testCaseFilters
+     */
+    public function __construct(private readonly array $testCaseFilters = [])
+    {
+    }
+
     /**
      * Counts the number of test cases.
      */
@@ -109,7 +117,17 @@ final class TestRepository
      */
     public function makeIfNeeded(string $filename): void
     {
-        if (array_key_exists($filename, $this->testCases)) {
+        if (!array_key_exists($filename, $this->testCases)) {
+            return;
+        }
+
+        $canLoad = array_reduce(
+            $this->testCaseFilters,
+            fn(bool $carry, TestCaseFilter $filter): bool => $carry && $filter->canLoad($filename),
+            true,
+        );
+
+        if ($canLoad) {
             $this->make($this->testCases[$filename]);
         }
     }

src/Support/DirtyTestCaseFilter.php

@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Support;
+
+use Pest\Contracts\TestCaseFilter;
+use Symfony\Component\Process\Process;
+
+final class DirtyTestCaseFilter implements TestCaseFilter
+{
+    /**
+     * @var array<string>
+     */
+    private array $changedFiles = [];
+
+    public function __construct(private string $projectRoot)
+    {
+        $this->loadDiff();
+    }
+
+    public function canLoad(string $suiteClassFile): bool
+    {
+        $relativePath = str_replace($this->projectRoot, '', $suiteClassFile);
+
+        if (str_starts_with($relativePath, '/')) {
+            $relativePath = substr($relativePath, 1);
+        }
+
+        return in_array($relativePath, $this->changedFiles, true);
+    }
+
+    private function loadDiff(): void
+    {
+        $process = new Process([
+            'git',
+            'diff',
+            '--name-only',
+            'HEAD',
+            '--',
+            '*.php',
+        ]);
+        $process->run();
+
+        $this->changedFiles = explode(PHP_EOL, trim($process->getOutput()));
+    }
+}

src/TestSuite.php

@@ -23,11 +23,6 @@ final class TestSuite
      */
     public ?TestCase $test = null;
 
-    /**
-     * Holds the tests repository.
-     */
-    public TestRepository $tests;
-
     /**
      * Holds the before each repository.
      */
@@ -68,11 +63,12 @@ final class TestSuite
      */
     public function __construct(
         string $rootPath,
-        public string $testPath)
+        public string $testPath,
+        public TestRepository $tests = new TestRepository(),
+    )
     {
         $this->beforeAll = new BeforeAllRepository();
         $this->beforeEach = new BeforeEachRepository();
-        $this->tests = new TestRepository();
         $this->afterEach = new AfterEachRepository();
         $this->afterAll = new AfterAllRepository();
         $this->retryTempRepository = new TempRepository('retry');
@@ -83,10 +79,14 @@ final class TestSuite
     /**
      * Returns the current instance of the test suite.
      */
-    public static function getInstance(string $rootPath = null, string $testPath = null): TestSuite
+    public static function getInstance(
+        string $rootPath = null,
+        string $testPath = null,
+        TestRepository $tests = null,
+    ): TestSuite
     {
         if (is_string($rootPath) && is_string($testPath)) {
-            self::$instance = new TestSuite($rootPath, $testPath);
+            self::$instance = new TestSuite($rootPath, $testPath, $tests);
 
             foreach (Plugin::$callables as $callable) {
                 $callable();