Method querySelectorAllOrElement

testing/helpers/service.js:264–268

* Helper to support providing already-selected elements to methods. * @param {string|Element} selectorOrElement * @return {Array }

(selectorOrElement)

   * @return {Array<Element>}
   */
  querySelectorAllOrElement(selectorOrElement) {
    return typeof selectorOrElement == 'string'
      ? this.rootNode_.querySelectorAll(selectorOrElement)
      : [selectorOrElement];
  }

  /**
   * @param {string} hostSelector