Added support for the base-less tests and symlinks.

.gitattributes

@@ -1,12 +1,16 @@
 # Ignore files for distribution archives.
 
-/.editorconfig   export-ignore
-/.gitattributes  export-ignore
-/.github         export-ignore
-/.gitignore      export-ignore
-/logo.png        export-ignore
-/phpcs.xml       export-ignore
-/phpmd.xml       export-ignore
-/phpstan.neon    export-ignore
-/rector.php      export-ignore
-/renovate.json  export-ignore
+/.editorconfig           export-ignore
+/.gitattributes          export-ignore
+/.github                 export-ignore
+/.gitignore              export-ignore
+/logo.png                export-ignore
+/phpcs.xml               export-ignore
+/phpmd.xml               export-ignore
+/phpstan.neon            export-ignore
+/phpunit.xml             export-ignore
+/rector.php              export-ignore
+/renovate.json           export-ignore
+/tests/phpunit/Fixtures  export-ignore
+/tests/phpunit/Functional/CreateProjectTest.php  export-ignore
+/tests/phpunit/Unit      export-ignore

tests/phpunit/Fixtures/assert_fixture_files/files_equal/dir1/.ignorecontent

@@ -25,8 +25,10 @@ dir2_flat/*
 
 # Ignore all files and subdirectories in the directory.
 dir3_subdirs/*
+dir3_subdirs_symlink/*
 # But include sub-sub-directory.
 !dir3_subdirs/dir32-unignored/
+!dir3_subdirs_symlink/dir32-unignored/
 
 # Ignore directory and all subdirectories.
 dir4_full_ignore/

tests/phpunit/Fixtures/assert_fixture_files/files_equal/dir1/d32f2_symlink_deep.txt

@@ -0,0 +1 @@
+d32f2l1

tests/phpunit/Fixtures/assert_fixture_files/files_equal/dir1/dir1_flat/d1f1_symlink.txt

@@ -0,0 +1 @@
+d1f1.txt

tests/phpunit/Fixtures/assert_fixture_files/files_equal/dir1/dir3_subdirs/dir32-unignored/d32f1_symlink.txt

@@ -0,0 +1 @@
+d32f1.txt

tests/phpunit/Fixtures/assert_fixture_files/files_equal/dir1/dir3_subdirs_symlink

@@ -0,0 +1 @@
+dir3_subdirs

tests/phpunit/Fixtures/assert_fixture_files/files_equal/dir1/f2_symlink.txt

@@ -0,0 +1 @@
+f2.txt

tests/phpunit/Fixtures/assert_fixture_files/files_equal/dir2/d32f2_symlink_deep.txt

@@ -0,0 +1 @@
+d32f2l1

tests/phpunit/Fixtures/assert_fixture_files/files_equal/dir2/dir1_flat/d1f1_symlink.txt

@@ -0,0 +1 @@
+d1f1.txt

tests/phpunit/Fixtures/assert_fixture_files/files_equal/dir2/dir3_subdirs/dir32-unignored/d32f1_symlink.txt

@@ -0,0 +1 @@
+d32f1.txt

tests/phpunit/Fixtures/assert_fixture_files/files_equal/dir2/dir3_subdirs_symlink

@@ -0,0 +1 @@
+dir3_subdirs

tests/phpunit/Fixtures/assert_fixture_files/files_equal/dir2/f2_symlink.txt

@@ -0,0 +1 @@
+f2.txt

tests/phpunit/Fixtures/assert_fixture_files/files_not_equal/dir1/d32f2_symlink_deep.txt

@@ -0,0 +1 @@
+d32f2l1

tests/phpunit/Fixtures/assert_fixture_files/files_not_equal/dir1/dir1_flat/d1f1_symlink.txt

@@ -0,0 +1 @@
+d1f1.txt

tests/phpunit/Fixtures/assert_fixture_files/files_not_equal/dir1/dir3_subdirs/dir32-unignored/d32f1_symlink.txt

@@ -0,0 +1 @@
+d32f1.txt

tests/phpunit/Fixtures/assert_fixture_files/files_not_equal/dir1/dir3_subdirs_symlink

@@ -0,0 +1 @@
+dir3_subdirs

tests/phpunit/Fixtures/assert_fixture_files/files_not_equal/dir1/f2_symlink.txt

@@ -0,0 +1 @@
+f2.txt

tests/phpunit/Fixtures/install_no_base/post_install/.ignorecontent

@@ -0,0 +1,5 @@
+.idea/
+.coverage-html/
+.phpunit.cache/
+vendor/
+^composer.lock

tests/phpunit/Fixtures/install_no_base/post_install/CustomizeCommand.php

@@ -0,0 +1 @@
+../../../../../CustomizeCommand.php

tests/phpunit/Fixtures/install_no_base/post_install/Plugin.php

@@ -0,0 +1 @@
+../../../../../Plugin.php

tests/phpunit/Fixtures/install_no_base/post_install/README.md

@@ -0,0 +1 @@
+../../../../../README.md

tests/phpunit/Fixtures/install_no_base/post_install/SECURITY.md

@@ -0,0 +1 @@
+../../../../../SECURITY.md

tests/phpunit/Fixtures/install_no_base/post_install/composer.json

@@ -0,0 +1,64 @@
+{
+    "name": "testorg/testpackage",
+    "description": "Test description",
+    "license": "MIT",
+    "type": "composer-plugin",
+    "authors": [
+        {
+            "name": "Alex Skrypnyk",
+            "email": "[email protected]",
+            "homepage": "https://alexskrypnyk.com",
+            "role": "Maintainer"
+        }
+    ],
+    "homepage": "https://github.com/alexskrypnyk/customizer",
+    "support": {
+        "issues": "https://github.com/alexskrypnyk/customizer/issues",
+        "source": "https://github.com/alexskrypnyk/customizer"
+    },
+    "require": {
+        "php": ">=8.2",
+        "composer-plugin-api": "^2.0"
+    },
+    "require-dev": {
+        "composer/composer": "^2.7",
+        "dealerdirect/phpcodesniffer-composer-installer": "^1.0",
+        "drupal/coder": "^8.3",
+        "ergebnis/composer-normalize": "^2.42",
+        "phpcompatibility/php-compatibility": "^9.3",
+        "phpstan/phpstan": "^2",
+        "phpunit/phpunit": "^11.1",
+        "rector/rector": "^2"
+    },
+    "prefer-stable": true,
+    "autoload": {
+        "psr-4": {
+            "AlexSkrypnyk\\Customizer\\": ""
+        }
+    },
+    "config": {
+        "allow-plugins": {
+            "dealerdirect/phpcodesniffer-composer-installer": true,
+            "ergebnis/composer-normalize": true
+        },
+        "sort-packages": true
+    },
+    "extra": {
+        "class": "AlexSkrypnyk\\Customizer\\Plugin",
+        "customizer": true
+    },
+    "scripts": {
+        "lint": [
+            "phpcs",
+            "phpstan",
+            "rector --clear-cache --dry-run"
+        ],
+        "lint-fix": [
+            "rector --clear-cache",
+            "phpcbf"
+        ],
+        "reset": "rm -Rf vendor vendor-bin composer.lock",
+        "test": "phpunit --no-coverage",
+        "test-coverage": "phpunit"
+    }
+}

tests/phpunit/Fixtures/install_no_base/post_install/tests/phpunit/Functional/CustomizerTestCase.php

@@ -0,0 +1 @@
+../../../../../../../../tests/phpunit/Functional/CustomizerTestCase.php

tests/phpunit/Functional/CreateProjectTest.php

@@ -42,6 +42,33 @@ public function testInstall(): void {
     $this->assertComposerLockUpToDate();
   }
 
+  /**
+   * Assert that fixtures without 'base' use the current directory as the base.
+   */
+  #[Group('install')]
+  public function testInstallNoBase(): void {
+    static::customizerSetAnswers([
+      'testorg/testpackage',
+      'Test description',
+      'MIT',
+      self::TUI_ANSWER_NOTHING,
+    ]);
+
+    $this->runComposerCreateProject();
+
+    $this->assertComposerCommandSuccessOutputContains('Welcome to the "alexskrypnyk/customizer" project customizer');
+    $this->assertComposerCommandSuccessOutputContains('Name');
+    $this->assertComposerCommandSuccessOutputContains('testorg/testpackage');
+    $this->assertComposerCommandSuccessOutputContains('Description');
+    $this->assertComposerCommandSuccessOutputContains('Test description');
+    $this->assertComposerCommandSuccessOutputContains('License');
+    $this->assertComposerCommandSuccessOutputContains('MIT');
+    $this->assertComposerCommandSuccessOutputContains('Project was customized');
+
+    $this->assertFixtureDirectoryEqualsSut('post_install');
+    $this->assertComposerLockUpToDate();
+  }
+
   #[RunInSeparateProcess]
   #[Group('install')]
   public function testInstallAdditionalCleanup(): void {

tests/phpunit/Functional/CustomizerTestCase.php

@@ -19,7 +19,7 @@
  * Base class for functional tests.
  *
  * This class is intended to be distributed with the Customizer package and
- * used in consumer site's tests to allow easy testing of the integrated
+ * used in consumer package's tests to allow easy testing of the integrated
  * Customizer command.
  *
  * Extend this class in your test case to get access to the Customizer command
@@ -193,10 +193,29 @@ protected function initLocations(string $cwd, ?callable $cb = NULL): void {
       static::$fixtures .= DIRECTORY_SEPARATOR . $this->dataName();
     }
 
-    // Copy the 'base' fixture files to the repository if they were provided for
-    // this test.
+    // Copy the 'base' fixture to the 'local' fixture.
     if (is_dir(static::$fixtures)) {
-      $this->fs->mirror(static::$fixtures . DIRECTORY_SEPARATOR . 'base', static::$repo);
+      $base_dir = static::$fixtures . DIRECTORY_SEPARATOR . 'base';
+
+      // Use this project's root directory as a base directory if the 'base'
+      // fixture was not provided. This allows to use the current project's
+      // files as a 'base' for the test.
+      //
+      // @note Composer uses .gitattributes to determine which files to include
+      // in the package when running `create-project`, so add the files that are
+      // not intended to be used in the consumer to the .gitattributes file
+      // of this project.
+      $allowed_files = [];
+      if (!is_dir($base_dir)) {
+        $base_dir = static::$root;
+        // Only use the git-tracked files to replicate a "clean" project as it
+        // would be seen by Composer at the code repository.
+        // Make sure to commit the changes locally before running
+        // the tests (even as a temporary commit).
+        $allowed_files = $this->getTrackedFiles($base_dir);
+      }
+
+      $this->mirrorFiltered($base_dir, static::$repo, $allowed_files);
     }
 
     if ($cb !== NULL && $cb instanceof \Closure) {
@@ -302,6 +321,87 @@ protected function runComposerCreateProject(array $options = []): void {
     $this->tester->run($options + $defaults);
   }
 
+  /**
+   * Get the tracked files in a Git repository.
+   *
+   * @param string $dir
+   *   The directory to check.
+   *
+   * @return array<string>
+   *   The list of tracked files.
+   *
+   * @throws \RuntimeException
+   *   If the directory is not a Git repository.
+   */
+  protected function getTrackedFiles(string $dir): array {
+    if (!is_dir($dir . '/.git')) {
+      throw new \RuntimeException("The directory is not a Git repository.");
+    }
+
+    $tracked_files = [];
+    $output = [];
+    $code = 0;
+    exec(sprintf('git --git-dir=%s --work-tree=%s ls-files', escapeshellarg($dir . '/.git'), escapeshellarg($dir)), $output, $code);
+    if ($code !== 0) {
+      throw new \RuntimeException("Failed to retrieve tracked files using git ls-files.");
+    }
+
+    foreach ($output as $file) {
+      $tracked_files[] = $dir . DIRECTORY_SEPARATOR . $file;
+    }
+
+    return $tracked_files;
+  }
+
+  /**
+   * Mirror a directory with filtering.
+   *
+   * @param string $src
+   *   The source directory.
+   * @param string $dst
+   *   The destination directory.
+   * @param array<string> $allowed_files
+   *   The list of allowed files.
+   */
+  protected function mirrorFiltered(string $src, string $dst, array $allowed_files = []): void {
+    $files = new \RecursiveIteratorIterator(
+      new \RecursiveDirectoryIterator($src, \FilesystemIterator::SKIP_DOTS | \FilesystemIterator::FOLLOW_SYMLINKS),
+    );
+
+    foreach ($files as $file) {
+      if (!$file instanceof \SplFileInfo) {
+        continue;
+      }
+
+      if (!empty($allowed_files) && !in_array($file->getPathname(), $allowed_files, TRUE)) {
+        continue;
+      }
+
+      $relative_path = substr($file->getPathname(), strlen($src) + 1);
+      $target_path = $dst . DIRECTORY_SEPARATOR . $relative_path;
+
+      if (!is_dir(dirname($target_path))) {
+        mkdir(dirname($target_path), 0755, TRUE);
+      }
+
+      // Always copy the contents of the file as a regular file.
+      if (is_link($file->getPathname())) {
+        // Resolve the symlink to the actual file content.
+        $resolved_path = realpath($file->getPathname());
+        if ($resolved_path !== FALSE) {
+          copy($resolved_path, $target_path);
+        }
+        else {
+          throw new \RuntimeException("Failed to resolve symlink for: " . $file->getPathname());
+        }
+      }
+      else {
+        // Copy regular files.
+        copy($file->getPathname(), $target_path);
+      }
+    }
+  }
+
   /**
    * Assert that the Composer lock file is up to date.
    */
@@ -500,6 +600,7 @@ protected function assertDirectoriesEqual(string $dir1, string $dir2, ?callable
       if (str_ends_with($pattern, DIRECTORY_SEPARATOR)) {
         return str_starts_with($path, rtrim($pattern, DIRECTORY_SEPARATOR));
       }
+
       // Match direct children (e.g., "dir/*").
       if (str_contains($pattern, '/*')) {
         $parent_dir = rtrim($pattern, '/*') . DIRECTORY_SEPARATOR;
@@ -514,7 +615,7 @@ protected function assertDirectoriesEqual(string $dir1, string $dir2, ?callable
     // Get the files in the directories.
     $get_files = static function (string $dir, array $rules, callable $match_path, ?callable $match_content): array {
       $files = [];
-      $iterator = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($dir, \FilesystemIterator::SKIP_DOTS));
+      $iterator = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($dir, \FilesystemIterator::SKIP_DOTS | \FilesystemIterator::FOLLOW_SYMLINKS));
       foreach ($iterator as $file) {
         if (!$file instanceof \SplFileInfo) {
           continue;

tests/phpunit/Unit/FilesTest.php

@@ -220,7 +220,7 @@ public static function dataProviderReplaceInPath(): array {
   }
 
   #[DataProvider('dataProviderreplaceInPathBetweenMarkers')]
-  public function testreplaceInPathBetweenMarkers(string $path, array $before, string $search, string $replace, string $start, string $end, array $after): void {
+  public function testReplaceInPathBetweenMarkers(string $path, array $before, string $search, string $replace, string $start, string $end, array $after): void {
     $this->createFileTree(static::$sut, $before);
 
     CustomizeCommand::replaceInPathBetweenMarkers(
@@ -235,7 +235,7 @@ public function testreplaceInPathBetweenMarkers(string $path, array $before, str
   }
 
   /**
-   * Data provider for testreplaceInPathBetweenMarkers.
+   * Data provider for testReplaceInPathBetweenMarkers.
    *
    * @return array
    *   The data.

tests/phpunit/Unit/SelfTest.php

@@ -64,7 +64,18 @@ public static function dataProviderAssertDirectoriesEqual(): array {
       'files_not_equal' => [
         [
           'dir1' => [
+            'd32f2_symlink_deep.txt',
+            'dir1_flat/d1f1_symlink.txt',
             'dir1_flat/d1f3-only-src.txt',
+            'dir3_subdirs/dir32-unignored/d32f1_symlink.txt',
+            'dir3_subdirs_symlink/d3f1-ignored.txt',
+            'dir3_subdirs_symlink/d3f2-ignored.txt',
+            'dir3_subdirs_symlink/dir31/d31f1-ignored.txt',
+            'dir3_subdirs_symlink/dir31/d31f2-ignored.txt',
+            'dir3_subdirs_symlink/dir32-unignored/d32f1.txt',
+            'dir3_subdirs_symlink/dir32-unignored/d32f1_symlink.txt',
+            'dir3_subdirs_symlink/dir32-unignored/d32f2.txt',
+            'f2_symlink.txt',
           ],
           'dir2' => [
             'dir2_flat-present-dst/d2f1.txt',