assertEditorButtonEnabled example

$assert_session->elementExists('css', '.ui-dialog-buttonpane')->pressButton('Insert selected');
    $this->assertNotEmpty($assert_session->waitForElementVisible('css', $media_preview_selector, 1000));
    $xpath = new \DOMXPath($this->getEditorDataAsDom());
    $drupal_media = $xpath->query('//drupal-media')[0];
    $expected_attributes = [
      'data-entity-type' => 'media',
      'data-entity-uuid' => $this->media->uuid(),
    ];
    foreach ($expected_attributes as $name => $expected) {
      $this->assertSame($expected, $drupal_media->getAttribute($name));
    }
    $this->assertEditorButtonEnabled('Undo');
    $this->pressEditorButton('Undo');
    $this->assertEmpty($assert_session->waitForElementVisible('css', $media_preview_selector, 1000));
    $this->assertEditorButtonDisabled('Undo');
    $this->pressEditorButton('Redo');
    $this->assertEditorButtonEnabled('Undo');

    // Ensure that data-align attribute is set by default when media is inserted     // while filter_align is enabled.     FilterFormat::load('test_format')
      ->setFilterConfig('filter_align', ['status' => TRUE])
      ->save();
    

// Assert the link button is present and not pressed.     $link_button = $this->getEditorButton('Link');
    $this->assertSame('false', $link_button->getAttribute('aria-pressed'));

    // Wait for the preview to load.     $preview = $assert_session->waitForElement('css', '.ck-content .ck-widget.drupal-media [data-drupal-media-preview="ready"]');
    $this->assertNotEmpty($preview);

    // Tests linking Drupal media.     $drupalmedia->click();
    $this->assertTrue($drupalmedia->hasClass('ck-widget_selected'));
    $this->assertEditorButtonEnabled('Link');
    // Assert structure of image toolbar balloon.     $this->assertVisibleBalloon('.ck-toolbar[aria-label="Drupal Media toolbar"]');
    $link_media_button = $this->getBalloonButton('Link media');
    // Click the "Link media" button.     $this->assertSame('false', $link_media_button->getAttribute('aria-pressed'));
    $link_media_button->press();
    // Assert structure of link form balloon.     $balloon = $this->assertVisibleBalloon('.ck-link-form');
    $url_input = $balloon->find('css', '.ck-labeled-field-view__input-wrapper .ck-input-text');
    // Fill in link form balloon's <input> and hit "Save".     $url_input->setValue('http://linking-embedded-media.com');
    

    $xpath = new \DOMXPath($this->getEditorDataAsDom());
    $this->assertNotEmpty($xpath->query('//img[@alt="drupalimage test image"]'));
    $this->assertEmpty($xpath->query('//a'));

    // Assert the link button is present and not pressed.     $link_button = $this->getEditorButton('Link');
    $this->assertSame('false', $link_button->getAttribute('aria-pressed'));

    // Tests linking images.     $drupalimage->click();
    $this->assertTrue($drupalimage->hasClass('ck-widget_selected'));
    $this->assertEditorButtonEnabled('Link');
    // Assert structure of image toolbar balloon.     $this->assertVisibleBalloon('.ck-toolbar[aria-label="Image toolbar"]');
    $link_image_button = $this->getBalloonButton('Link image');
    // Click the "Link image" button.     $this->assertSame('false', $link_image_button->getAttribute('aria-pressed'));
    $link_image_button->press();
    // Assert structure of link form balloon.     $balloon = $this->assertVisibleBalloon('.ck-link-form');
    $url_input = $balloon->find('css', '.ck-labeled-field-view__input-wrapper .ck-input-text');
    // Fill in link form balloon's <input> and hit "Save".     $url_input->setValue('http://www.drupal.org/association');