[Webkit-unassigned] [Bug 203225] New: [ Mac ] Layout Test legacy-animation-engine/compositing/backing/transform-transition-from-outside-view.html is flaky

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=203225

            Bug ID: 203225
           Summary: [ Mac ] Layout Test
                    legacy-animation-engine/compositing/backing/transform-
                    transition-from-outside-view.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: tsavell at apple.com

The following layout test is flaky on Mac

legacy-animation-engine/compositing/backing/transform-transition-from-outside-view.html

Probable cause:

This test is highly flakey on Mac. It has expectations set for wk1 already but has been failing on wk2 as well. Test was introduced in https://trac.webkit.org/changeset/230471/webkit . I am able to reproduce it easily with running it In iterations. I have been unable so far to find a revision that this does not fail on.

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=legacy-animation-engine%2Fcompositing%2Fbacking%2Ftransform-transition-from-outside-view.html

Diff:
--- /Volumes/Data/slave/mojave-release-tests-wk2/build/layout-test-results/legacy-animation-engine/compositing/backing/transform-transition-from-outside-view-expected.txt
+++ /Volumes/Data/slave/mojave-release-tests-wk2/build/layout-test-results/legacy-animation-engine/compositing/backing/transform-transition-from-outside-view-actual.txt
@@ -14,7 +14,7 @@
           (bounds 148.00 128.00)
           (drawsContent 1)
           (backingStoreAttached 1)
-          (transform [1.00 0.00 0.00 0.00] [0.00 1.00 0.00 0.00] [0.00 0.00 1.00 0.00] [-400.00 0.00 0.00 1.00])
+          (transform [1.00 0.00 0.00 0.00] [0.00 1.00 0.00 0.00] [0.00 0.00 1.00 0.00] [-399.99 0.00 0.00 1.00])
           (children 1
             (GraphicsLayer
               (offsetFromRenderer width=-14 height=-14)

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