[Webkit-unassigned] [Bug 186055] New: [macOS WK2 Release] Layout Test media/video-trackmenu-selection.html is flaky

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=186055

            Bug ID: 186055
           Summary: [macOS WK2 Release] Layout Test
                    media/video-trackmenu-selection.html is flaky
           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: David_fenton at apple.com
                CC: lforschler at apple.com

The following test is flay on macOS Sierra Release WK2

media/video-trackmenu-selection.html
https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=media%2Fvideo-trackmenu-selection.html%20

sample diff:
--- /Volumes/Data/slave/highsierra-release-tests-wk2/build/layout-test-results/media/video-trackmenu-selection-expected.txt
+++ /Volumes/Data/slave/highsierra-release-tests-wk2/build/layout-test-results/media/video-trackmenu-selection-actual.txt
@@ -6,34 +6,6 @@
 *** Set the user's preferred language to English, enable automatic caption selection.
 RUN(internals.setUserPreferredLanguages(['en']))
 RUN(internals.setCaptionDisplayMode('AlwaysOn'))
-
-** The preferred language is set to English, but the Spanish track should be enabled because it is available
-Track menu:
-0: "Off"
-1: "Auto (Recommended)"
-2: "Spanish", checked
-EXPECTED (video.textTracks[0].mode == 'showing') OK
-
-*** Add a text track in the preferred language.
-RUN(track = document.createElement('track'))
-RUN(track.setAttribute('kind', 'captions'))
-RUN(track.src = 'data:text/vtt,WEBVTT%0A%0A00%3A00%3A00.000%20--%3E%2000%3A00%3A01.000%0ACaption%201%0A')
-RUN(track.setAttribute('srclang', 'en'))
-RUN(track.setAttribute('onload', 'trackLoaded()'))
-RUN(video.appendChild(track))
-
-EVENT(load)
-
-*** The new track should be selected because it is in the preferred language.
-EXPECTED (event.target.srclang == 'en') OK
-EXPECTED (event.target.readyState == '2') OK
-EXPECTED (video.textTracks[0].mode == 'disabled') OK
-EXPECTED (video.textTracks[1].mode == 'showing') OK
-Track menu:
-0: "Off"
-1: "Auto (Recommended)"
-2: "English", checked
-3: "Spanish"
-
+clickCCButton failed with exception: "undefined: FAIL
 END OF TEST

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