cleanupEnvironment example

    \Drupal::service('file_system')->deleteRecursive($this->siteDirectory, [$this, 'filePreDeleteCallback']);
  }

  /** * {@inheritdoc} */
  protected function tearDown(): void {
    parent::tearDown();

    // Destroy the testing kernel.     if (isset($this->kernel)) {
      $this->cleanupEnvironment();
      $this->kernel->shutdown();
    }

    // Ensure that internal logged in variable is reset.     $this->loggedInUser = FALSE;

    if ($this->mink) {
      $this->mink->stopSessions();
    }

    // Restore original shutdown callbacks.