' . Html::escape($content));
    return $content;
  }

  /**
   * Sets an in-memory Settings variable.
   *
   * @param string $name
   *   The name of the setting to set.
   * @param bool|string|int|array|null $value
   *   The value to set. Note that array values are replaced entirely; use
   *   \Drupal\Core\Site\Settings::get() to perform custom merges.
   */
  protected function setSetting($name, $value) {
    $settings = Settings::getInstance() ? Settings::getAll() : [];
    $settings[$name] = $value;
    new Settings($settings);
  }

  /**
   * Stops test execution.
   */
  protected function stop() {
    $this->getTestResultObject()->stop();
  }

  /**
   * Dumps the current state of the virtual filesystem to STDOUT.
   */
  protected function vfsDump() {
    vfsStream::inspect(new vfsStreamPrintVisitor());
  }

  /**
   * Returns the modules to enable for this test.
   *
   * @param string $class
   *   The fully-qualified class name of this test.
   *
   * @return array
   */
  private static function getModulesToEnable($class) {
    $modules = [];
    while ($class) {
      if (property_exists($class, 'modules')) {
        // Only add the modules, if the $modules property was not inherited.
        $rp = new \ReflectionProperty($class, 'modules');
        if ($rp->class == $class) {
          $modules[$class] = $class::$modules;
        }
      }
      $class = get_parent_class($class);
    }
    // Modules have been collected in reverse class hierarchy order; modules
    // defined by base classes should be sorted first. Then, merge the results
    // together.
    $modules = array_reverse($modules);
    return call_user_func_array('array_merge_recursive', $modules);
  }

  /**
   * {@inheritdoc}
   */
  protected function prepareTemplate(\Text_Template $template) {
    $bootstrap_globals = '';

    // Fix missing bootstrap.php when $preserveGlobalState is FALSE.
    // @see https://github.com/sebastianbergmann/phpunit/pull/797
    $bootstrap_globals .= '$__PHPUNIT_BOOTSTRAP = ' . var_export($GLOBALS['__PHPUNIT_BOOTSTRAP'], TRUE) . ";\n";

    // Avoid repetitive test namespace discoveries to improve performance.
    // @see /core/tests/bootstrap.php
    $bootstrap_globals .= '$namespaces = ' . var_export($GLOBALS['namespaces'], TRUE) . ";\n";

    $template->setVar([
      'constants' => '',
      'included_files' => '',
      'globals' => $bootstrap_globals,
    ]);
  }

  /**
   * Returns whether the current test runs in isolation.
   *
   * @return bool
   *
   * @see https://github.com/sebastianbergmann/phpunit/pull/1350
   */
  protected function isTestInIsolation() {
    return function_exists('__phpunit_run_isolated_test');
  }

  /**
   * BC: Automatically resolve former KernelTestBase class properties.
   *
   * Test authors should follow the provided instructions and adjust their tests
   * accordingly.
   *
   * @deprecated in Drupal 8.0.x, will be removed before Drupal 8.2.0.
   */
  public function __get($name) {
    if (in_array($name, [
      'public_files_directory',
      'private_files_directory',
      'temp_files_directory',
      'translation_files_directory',
    ])) {
      // @comment it in again.
      trigger_error(sprintf("KernelTestBase::\$%s no longer exists. Use the regular API method to retrieve it instead (e.g., Settings).", $name), E_USER_DEPRECATED);
      switch ($name) {
        case 'public_files_directory':
          return Settings::get('file_public_path', \Drupal::service('site.path') . '/files');

        case 'private_files_directory':
          return Settings::get('file_private_path');

        case 'temp_files_directory':
          return file_directory_temp();

        case 'translation_files_directory':
          return Settings::get('file_public_path', \Drupal::service('site.path') . '/translations');
      }
    }

    if ($name === 'configDirectories') {
      trigger_error(sprintf("KernelTestBase::\$%s no longer exists. Use config_get_config_directory() directly instead.", $name), E_USER_DEPRECATED);
      return [
        CONFIG_SYNC_DIRECTORY => config_get_config_directory(CONFIG_SYNC_DIRECTORY),
      ];
    }

    $denied = [
      // @see \Drupal\simpletest\TestBase
      'testId',
      'timeLimit',
      'results',
      'assertions',
      'skipClasses',
      'verbose',
      'verboseId',
      'verboseClassName',
      'verboseDirectory',
      'verboseDirectoryUrl',
      'dieOnFail',
      'kernel',
      // @see \Drupal\simpletest\TestBase::prepareEnvironment()
      'generatedTestFiles',
      // Properties from the old KernelTestBase class that has been removed.
      'keyValueFactory',
    ];
    if (in_array($name, $denied) || strpos($name, 'original') === 0) {
      throw new \RuntimeException(sprintf('TestBase::$%s property no longer exists', $name));
    }
  }

  /**
   * Prevents serializing any properties.
   *
   * Kernel tests are run in a separate process. To do this PHPUnit creates a
   * script to run the test. If it fails, the test result object will contain a
   * stack trace which includes the test object. It will attempt to serialize
   * it. Returning an empty array prevents it from serializing anything it
   * should not.
   *
   * @return array
   *   An empty array.
   *
   * @see vendor/phpunit/phpunit/src/Util/PHP/Template/TestCaseMethod.tpl.dist
   */
  public function __sleep() {
    return [];
  }

  /**
   * {@inheritdoc}
   */
  public static function assertEquals($expected, $actual, $message = '', $delta = 0.0, $maxDepth = 10, $canonicalize = FALSE, $ignoreCase = FALSE) {
    // Cast objects implementing MarkupInterface to string instead of
    // relying on PHP casting them to string depending on what they are being
    // comparing with.
    $expected = static::castSafeStrings($expected);
    $actual = static::castSafeStrings($actual);
    parent::assertEquals($expected, $actual, $message, $delta, $maxDepth, $canonicalize, $ignoreCase);
  }

}