Bug 206949 – [ Mac ] fast/dom/Window/post-message-crash.html is flaky failing

• Component: New Bugs
• Status: RESOLVED FIXED

[Jason Lawrence]

fast/dom/Window/post-message-crash.html

Description: 
This test is flaky failing on Mac. I see a potential regression point of 252824.

History:
https://results.webkit.org/?suite=layout-tests&test=fast%2Fdom%2FWindow%2Fpost-message-crash.html

Diff:
--- /Volumes/Data/slave/catalina-leaks/build/layout-test-results/fast/dom/Window/post-message-crash-expected.txt
+++ /Volumes/Data/slave/catalina-leaks/build/layout-test-results/fast/dom/Window/post-message-crash-actual.txt
@@ -1,3 +1,3 @@
 This ensures that postMessage called in a callback does not crash.
 
-PASS
+FAIL

[Radar WebKit Bug Importer]

<rdar://problem/58997453>

[Jason Lawrence]

Created attachment 389157 [details]
Update Test Expectations

[Truitt Savell]

Comment on attachment 389157 [details]
Update Test Expectations

Clearing flags on attachment: 389157

Committed r255370: <https://trac.webkit.org/changeset/255370>

[Alexey Proskuryakov]

This test was already marked as flaky on iOS. Clearly a regression on Mac, at least in frequency.

[Chris Dumez]

The test relies on a 50ms timer :(

setTimeout(function() {
    if (window.testRunner)
        testRunner.notifyDone();
}, 50);

[Chris Dumez]

Committed r255427: <https://trac.webkit.org/changeset/255427>

[Alexey Proskuryakov]

This would have helped help if the test lacked output, but that's not the failure seen here.

[Alexey Proskuryakov]

I was wrong, the test replaces FAIL with PASS.