Method waitForElementBuild

testing/helpers/service.js:295–311

* @param {string} selector * @param {number=} timeout * @return {!Promise}

(selectorOrElement, timeout = 5000)

   * @return {!Promise}
   */
  waitForElementBuild(selectorOrElement, timeout = 5000) {
    const elements = this.querySelectorAllOrElement(selectorOrElement);
    if (!elements.length) {
      throw new Error(`BrowserController query failed: ${selectorOrElement}`);
    }
    return poll(
      `"${selectorOrElement}" to build`,
      () => {
        const someNotBuilt = [].some.call(elements, (e) =>
          e.classList.contains('i-amphtml-notbuilt')
        );
        return !someNotBuilt;
      },
      /* onError */ undefined,
      timeout
    );
  }

  /**
   * @param {string} selector