[Webkit-unassigned] [Bug 196502] New: [ Mac WK1 ] REGRESSION (r240537) Layout Test media/video-background-tab-playback.html is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=196502

            Bug ID: 196502
           Summary: [ Mac WK1 ] REGRESSION (r240537) Layout Test
                    media/video-background-tab-playback.html is a flaky
                    failure
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sroberts at apple.com
                CC: lforschler at apple.com

The following layout test is flaky on Mac Release WK1

media/video-background-tab-playback.html

Probable cause:

Test is a flaky failure on the dashboard for its entire available history. Local testing found approximately 10 failures in 500 iterations after https://trac.webkit.org/changeset/240537/webkit

Testing done with r240536 and older yield passing results.

Reproduced with:

run-webkit-tests media/video-background-tab-playback.html --iterations 500 -f -1

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=media%2Fvideo-background-tab-playback.html

Diff:

--- /Volumes/Data/slave/mojave-release-tests-wk1/build/layout-test-results/media/video-background-tab-playback-expected.txt
+++ /Volumes/Data/slave/mojave-release-tests-wk1/build/layout-test-results/media/video-background-tab-playback-actual.txt
@@ -13,14 +13,14 @@


 ** 100ms timer fired...
-EXPECTED (video.paused == 'true') OK
+EXPECTED (video.paused == 'true'), OBSERVED 'false' FAIL

 ** Simulate switch back to foreground, video should remain paused.
 RUN(internals.applicationWillEnterForeground())


 ** 100ms timer fired...
-EXPECTED (video.paused == 'true') OK
+EXPECTED (video.paused == 'true'), OBSERVED 'false' FAIL

 END OF TEST

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