class MaximumFileSizeExceededUploadTest

class MaximumFileSizeExceededUploadTest extends WebDriverTestBase {
    use FileFieldCreationTrait;
    use TestFileCreationTrait;
    
    /**
     * {@inheritdoc}
     */
    protected 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() : void {
        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' => 'bin 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() : void {
        // 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() : void {
        $session = $this->getSession();
        // Create a test file that exceeds the maximum POST size with 1 kilobyte.
        $post_max_size = (int) Bytes::toNumber(ini_get('post_max_size'));
        $invalid_file = 'public://exceeding_post_max_size.bin';
        $file = fopen($invalid_file, 'wb');
        fseek($file, $post_max_size + 1024);
        fwrite($file, '0');
        fclose($file);
        // 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. 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()
            ->statusMessageContainsAfterWait('An unrecoverable error occurred. The uploaded file likely exceeded the maximum file size', 'error');
        // 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()
            ->statusMessageNotExistsAfterWait('error');
    }

}