setEditor example

    // automatically get the default CKEditor 5 settings.     // @todo Update after https://www.drupal.org/project/drupal/issues/3226673.     /** @var \Drupal\editor\Entity\Editor $editor */
    $editor = $text_editor !== NULL
      ? clone $text_editor
      : Editor::create([
        'format' => $text_format->id(),
        // @see \Drupal\editor\Entity\Editor::__construct()         // @see \Drupal\ckeditor5\Plugin\Editor\CKEditor5::getDefaultSettings()         'editor' => 'ckeditor5',
      ]);
    $editor->setEditor('ckeditor5');

    $source_editing_additions = HTMLRestrictions::emptySet();
    // Compute the appropriate settings based on the CKEditor 4 configuration     // if it exists.     $old_editor = $editor->id() ? Editor::load($editor->id()) : NULL;
    $old_editor_restrictions = $old_editor ? HTMLRestrictions::fromTextFormat($old_editor->getFilterFormat()) : HTMLRestrictions::emptySet();
    // @todo Remove in https://www.drupal.org/project/drupal/issues/3245351     if ($old_editor) {
      $editor->setImageUploadSettings($old_editor->getImageUploadSettings());
    }
    if ($old_editor && $old_editor->getEditor() === 'ckeditor') {
      [

$this->assertValidationErrors([
      '' => 'This text editor requires a text format.',
      'dependencies.config.0' => "The 'filter.format' config does not exist.",
      'dependencies.config.1' => "The 'filter.format.' config does not exist.",
    ]);
  }

  /** * Tests validating an editor with an unknown plugin ID. */
  public function testInvalidPluginId(): void {
    $this->entity->setEditor('non_existent');
    $this->assertValidationErrors(['editor' => "The 'non_existent' plugin does not exist."]);
  }

}