class ComposerBuildTestBase

abstract class ComposerBuildTestBase extends BuildTestBase {
    
    /**
     * Relative path from Drupal root to the Components directory.
     *
     * @var string
     */
    protected static $componentsPath = '/core/lib/Drupal/Component';
    
    /**
     * Assert that the VERSION constant in Drupal.php is the expected value.
     *
     * @param string $expectedVersion
     *   The expected version.
     * @param string $dir
     *   The path to the site root.
     *
     * @internal
     */
    protected function assertDrupalVersion(string $expectedVersion, string $dir) : void {
        $drupal_php_path = $dir . '/core/lib/Drupal.php';
        $this->assertFileExists($drupal_php_path);
        // Read back the Drupal version that was set and assert it matches
        // expectations
        $this->executeCommand("php -r 'include \"{$drupal_php_path}\"; print \\Drupal::VERSION;'");
        $this->assertCommandSuccessful();
        $this->assertCommandOutputContains($expectedVersion);
    }
    
    /**
     * Find all the composer.json files for components.
     *
     * @param string $drupal_root
     *   The Drupal root directory.
     *
     * @return \Symfony\Component\Finder\Finder
     *   A Finder object with all the composer.json files for components.
     */
    protected static function getComponentPathsFinder(string $drupal_root) : Finder {
        $finder = new Finder();
        $finder->name('composer.json')
            ->in($drupal_root . static::$componentsPath)
            ->ignoreUnreadableDirs()
            ->depth(1);
        return $finder;
    }

}