Bug 182613 – Layout Test imported/w3c/web-platform-tests/service-workers/service-worker/postmessage-msgport-to-client.https.html is flaky

• Status: NEW
• Component: Service Workers

[Matt Lewis]

The following layout test is flaky on macOS WK2

imported/w3c/web-platform-tests/service-workers/service-worker/postmessage-msgport-to-client.https.html

Probable cause:

The test was un-skipped in https://trac.webkit.org/changeset/227543/webkit with the assumption it was no longer flaky, however it has started to become flaky again however it looks to be due to a harness timeout rather than the test failing itself.

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=imported%2Fw3c%2Fweb-platform-tests%2Fservice-workers%2Fservice-worker%2Fpostmessage-msgport-to-client.https.html



https://build.webkit.org/results/Apple%20High%20Sierra%20Release%20WK2%20(Tests)/r228276%20(2826)/results.html

Diff:
--- /Volumes/Data/slave/highsierra-release-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/service-workers/service-worker/postmessage-msgport-to-client.https-expected.txt
+++ /Volumes/Data/slave/highsierra-release-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/service-workers/service-worker/postmessage-msgport-to-client.https-actual.txt
@@ -1,3 +1,5 @@
 
-PASS postMessage MessagePorts from ServiceWorker to Client 
+Harness Error (TIMEOUT), message = null
 
+TIMEOUT postMessage MessagePorts from ServiceWorker to Client Test timed out
+