class MaximumFileSizeExceededUploadTest

class MaximumFileSizeExceededUploadTest extends WebDriverTestBase {
  use FileFieldCreationTrait;
  use TestFileCreationTrait;
  
  /**
   * {@inheritdoc}
   */
  public static $modules = [
    'node',
    'file',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * The file system service.
   *
   * @var \Drupal\Core\File\FileSystemInterface
   */
  protected $fileSystem;
  
  /**
   * A test user.
   *
   * @var \Drupal\user\UserInterface
   */
  protected $user;
  
  /**
   * The original value of the 'display_errors' PHP configuration option.
   *
   * @todo Remove this when issue #2905597 is fixed.
   * @see https://www.drupal.org/node/2905597
   *
   * @var string
   */
  protected $originalDisplayErrorsValue;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() {
    parent::setUp();
    $this->fileSystem = $this->container
      ->get('file_system');
    // Create the Article node type.
    $this->drupalCreateContentType([
      'type' => 'article',
      'name' => 'Article',
    ]);
    // Attach a file field to the node type.
    $field_settings = [
      'file_extensions' => 'txt',
    ];
    $this->createFileField('field_file', 'node', 'article', [], $field_settings);
    // Log in as a content author who can create Articles.
    $this->user = $this->drupalCreateUser([
      'access content',
      'create article content',
    ]);
    $this->drupalLogin($this->user);
    // Disable the displaying of errors, so that the AJAX responses are not
    // contaminated with error messages about exceeding the maximum POST size.
    // @todo Remove this when issue #2905597 is fixed.
    // @see https://www.drupal.org/node/2905597
    $this->originalDisplayErrorsValue = ini_set('display_errors', '0');
  }
  
  /**
   * {@inheritdoc}
   */
  protected function tearDown() {
    // Restore the displaying of errors to the original value.
    // @todo Remove this when issue #2905597 is fixed.
    // @see https://www.drupal.org/node/2905597
    ini_set('display_errors', $this->originalDisplayErrorsValue);
    parent::tearDown();
  }
  
  /**
   * Tests that uploading files exceeding maximum size are handled correctly.
   */
  public function testUploadFileExceedingMaximumFileSize() {
    $session = $this->getSession();
    // Create a test file that exceeds the maximum POST size with 1 kilobyte.
    $post_max_size = Bytes::toInt(ini_get('post_max_size'));
    $invalid_file = $this->generateFile('exceeding_post_max_size', ceil(($post_max_size + 1024) / 1024), 1024);
    // Go to the node creation form and try to upload the test file.
    $this->drupalGet('node/add/article');
    $page = $session->getPage();
    $page->attachFileToField("files[field_file_0]", $this->fileSystem
      ->realpath($invalid_file));
    // An error message should appear informing the user that the file exceeded
    // the maximum file size.
    $this->assertSession()
      ->waitForElement('css', '.messages--error');
    // The error message includes the actual file size limit which depends on
    // the current environment, so we check for a part of the message.
    $this->assertSession()
      ->pageTextContains('An unrecoverable error occurred. The uploaded file likely exceeded the maximum file size');
    // Now upload a valid file and check that the error message disappears.
    $valid_file = $this->generateFile('not_exceeding_post_max_size', 8, 8);
    $page->attachFileToField("files[field_file_0]", $this->fileSystem
      ->realpath($valid_file));
    $this->assertSession()
      ->waitForElement('named', [
      'id_or_name',
      'field_file_0_remove_button',
    ]);
    $this->assertSession()
      ->elementNotExists('css', '.messages--error');
  }

}