[Webkit-unassigned] [Bug 181499] [iOS WK2] Layout Test imported/w3c/web-platform-tests/service-workers/service-worker/update-after-navigation-fetch-event.https.html is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=181499

--- Comment #4 from Chris Dumez <cdumez at apple.com> ---
(In reply to Chris Dumez from comment #3)
> Looking at the flakiness dashboard, it is almost all green. There is exactly
> one failure and it is a TEXT one, not a TIMEOUT:
> ---
> /Volumes/Data/slave/ios-simulator-11-debug-tests-wk2/build/layout-test-
> results/imported/w3c/web-platform-tests/service-workers/service-worker/
> update-after-navigation-fetch-event.https-expected.txt
> +++
> /Volumes/Data/slave/ios-simulator-11-debug-tests-wk2/build/layout-test-
> results/imported/w3c/web-platform-tests/service-workers/service-worker/
> update-after-navigation-fetch-event.https-actual.txt
> @@ -1,3 +1,3 @@
>  
> -PASS Update should be triggered after a navigation fetch event. 
> +FAIL Update should be triggered after a navigation fetch event.
> promise_test: Unhandled rejection with value: object "Error: wait_for_state
> must be passed a ServiceWorker"

The test looks like:
return service_worker_unregister_and_register(t, parsed_url, scope)
      .then(function(r) {
          registration = r;
          return wait_for_state(t, registration.installing, 'activated');
        })

wait_for_state() is given null so registration.installing is null. I believe this means that the worker is already active. This can happen when registering a service worker that is already registered. The test attempts to unregister *then* register. However, because of the "Try Clear Registration" algorithm, the registration might be kept, simply marked as uninstalling.

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