assertNoRealtimeValidationErrors example

$this->createNewTextFormat($page, $assert_session);
    $assert_session->assertWaitOnAjaxRequest();

    // The Style plugin settings form should not be present.     $assert_session->elementNotExists('css', '[data-drupal-selector="edit-editor-settings-plugins-ckeditor5-style"]');

    $this->assertNotEmpty($assert_session->waitForElement('css', '.ckeditor5-toolbar-item-style'));
    $this->triggerKeyUp('.ckeditor5-toolbar-item-style', 'ArrowDown');
    $assert_session->assertWaitOnAjaxRequest();

    // No validation error upon enabling the Style plugin.     $this->assertNoRealtimeValidationErrors();
    $assert_session->pageTextContains('No styles configured');

    // Still no validation error when configuring other functionality first.     $this->triggerKeyUp('.ckeditor5-toolbar-item-undo', 'ArrowDown');
    $assert_session->assertWaitOnAjaxRequest();
    $this->assertNoRealtimeValidationErrors();

    // The Style plugin settings form should now be present and should have no     // styles configured.     $page->clickLink('Style');
    $this->assertNotNull($assert_session->waitForElementVisible('css', '[data-drupal-selector="edit-editor-settings-plugins-ckeditor5-style-styles"]'));