Bug 221731 – [ MacOS Debug wk2] imported/w3c/web-platform-tests/worklets/animation-worklet-service-worker-interception.https.html is a flakey text failure

• Component: New Bugs
• Status: RESOLVED FIXED

[Robert Jenner]

imported/w3c/web-platform-tests/worklets/animation-worklet-service-worker-interception.https.html

Is a flakey text failure in macOS Debug for both Catalina and Big Sur in wk2. 

HISTORY URL:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fworklets%2Fanimation-worklet-service-worker-interception.https.html&platform=mac

DIFF URL:
https://build.webkit.org/results/Apple-BigSur-Debug-WK2-Tests/r272683%20(70)/imported/w3c/web-platform-tests/worklets/animation-worklet-service-worker-interception.https-pretty-diff.html

DIFF TEXT:
--- /Volumes/Data/slave/bigsur-debug-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/worklets/animation-worklet-service-worker-interception.https-expected.txt
+++ /Volumes/Data/slave/bigsur-debug-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/worklets/animation-worklet-service-worker-interception.https-actual.txt
@@ -1 +1,5 @@
 
+FAIL addModule() on a controlled document should be intercepted by a service worker. assert_equals: expected (string) "RESOLVED" but got (object) object "[object Object]"
+FAIL addModule() on a non-controlled document should not be intercepted by a service worker even if the script is under the service worker scope. assert_equals: expected (string) "REJECTED" but got (object) object "[object Object]"
+FAIL Static import should be intercepted by a service worker. assert_equals: expected (string) "RESOLVED" but got (object) object "[object Object]"
+

Was able to reproduce same failure as above in r272683 using the following test:

run-webkit-test imported/w3c/web-platform-tests/worklets/animation-worklet-service-worker-interception.https.html --iterations 1000 -f --debug

[Radar WebKit Bug Importer]

<rdar://problem/74213595>

[Robert Jenner]

Flakey failures have been occurring with this test for a very long time. As such, I was not able to find a regression point.

[Chris Dumez]

Committed r272745: <https://trac.webkit.org/changeset/272745>