message: test(docs-infra): fix and enable remaining `component-interaction` e2e tests
  Previously, some of the e2e tests of the `component-interaction` docs
  example were disabled because they were failing.
  This commit fixes and re-enables them.
  PR Close
diff: @@ -145,19 +145,25 @@ describe('Component Communication Cookbook Tests', () => {
  // #enddocregion child-to-parent
  });
  - // Can't run timer tests in protractor because
  - // interaction w/ zones causes all tests to freeze & timeout.
  - xdescribe('Parent calls child via local var', () => {
  + describe('Parent calls child via local var', () => {
  countDownTimerTests('app-countdown-parent-lv');
  });
  - xdescribe('Parent calls ViewChild', () => {
  + describe('Parent calls ViewChild', () => {
  countDownTimerTests('app-countdown-parent-vc');
  });
  function countDownTimerTests(parentTag: string) {
  // #docregion countdown-timer-tests
  // ...
  + // The tests trigger periodic asynchronous operations (via `setInterval()`), which will prevent
  + // the app from stabilizing. See https://angular.io/api/core/ApplicationRef#is-stable-examples
  + // for more details.
  + // To allow the tests to complete, we will disable automatically waiting for the Angular app to
  + // stabilize.
  + beforeEach(() => browser.waitForAngularEnabled(false));
  + afterEach(() => browser.waitForAngularEnabled(true));
  +
  it('timer and parent seconds should match', async () => {
  const parent = element(by.tagName(parentTag));
  const startButton = parent.element(by.buttonText('Start'));
  @@ -165,7 +171,9 @@ describe('Component Communication Cookbook Tests', () => {
  const timer = parent.element(by.tagName('app-countdown-timer'));
  await startButton.click();
  - await browser.sleep(10); // give `seconds` a chance to catchup with `timer`
  +
  + // Wait for `<app-countdown-timer>` to be populated with any text.
  + await browser.wait(() => timer.getText(), 2000);
  expect(await timer.getText()).toContain(await seconds.getText());
  });
  