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;
  }

}