Failed: script timeout: result was not received in 11 seconds From: Task: Protractor.waitForAngular() - Locator: By(css selector, #my-btn)

问题

I'm trying to write some e2e test for my Angular application using Protractor.

I have a simple html button having id=my-btn which I want to click, using:

$('#my-btn').click();

Unfortunately I'm getting the following errors:

Failed: script timeout: result was not received in 11 seconds

From: Task: Protractor.waitForAngular() - Locator: By(css selector, #my-btn)

(Session info: chrome=73.0.3683.75)
(Driver info: chromedriver=2.46.628411 (3324f4c8be9ff2f70a05a30ebc72ffb013e1a71e),platform=Mac OS X 10.14.3 x86_64)

If before the click I set:

browser.waitForAngularEnabled(false);

then I don't get any errors. The problem is that doing that means:

 * If set to false, Protractor will not wait for Angular $http and $timeout
 * tasks to complete before interacting with the browser. This can cause
 * flaky tests, but should be used if, for instance, your app continuously
 * polls an API with $timeout.

So I would like what is causing the waitForAngular operation to timeout.

Is there a way to check what http or timeout are still hanging?

I want to debug my application to understand what's going on.

回答1:

I had some trouble with this. There are a few things you can try.

1. Manually check to see if you have any timed operations. My app, for example, had a timer that does a health check every 5 minutes. But this timer operation being on the stack constantly meant that Angular never stabilized.

If you do find such an operation, you can use ngZone.runOutsideAngular() to keep it from destabilizing your tests.

constructor(
    private ngZone: NgZone
  ) {}

ngOnInit() {
  this.ngZone.runOutsideAngular(() => {
    this.appStatusInterval = interval(this.appStatusUpdateIntervalTime)
       // rest of your code here
    });
  });
}

2. Open the dev tools and run getAllAngularTestabilities(). Try to get what information you can from there. You can try to get extra data from the source code. This bit in particular might be useful to you:

isStable(): boolean {
    return this._isZoneStable && this._pendingCount === 0 && !this._ngZone.hasPendingMacrotasks;
}

You can at least get more of an idea on what's destabilizing Angular by checking each of these three conditions in turn.

来源：https://stackoverflow.com/questions/55240582/failed-script-timeout-result-was-not-received-in-11-seconds-from-task-protra