constructor() {
    super();

    this.getTrogClassId = () => 'TestPlugin';

    /** @suppress {checkTypes} suppression added to enable type checking */
    this.handleKeyDown = () => {};
    /** @suppress {checkTypes} suppression added to enable type checking */
    this.handleKeyPress = () => {};
    /** @suppress {checkTypes} suppression added to enable type checking */
    this.handleKeyUp = () => {};
    /** @suppress {checkTypes} suppression added to enable type checking */
    this.handleKeyboardShortcut = () => {};
    /** @suppress {checkTypes} suppression added to enable type checking */
    this.isSupportedCommand = () => {};
    this.execCommandInternal = () => {};
    this.queryCommandValue = () => {};
    /** @suppress {checkTypes} suppression added to enable type checking */
    this.activeOnUneditableFields = () => {};
    /** @suppress {checkTypes} suppression added to enable type checking */
    this.handleSelectionChange = () => {};
  }
Dummy plugin for test usage.
@final