[Webkit-unassigned] [Bug 195233] New: [ Mac WK2 iOS Debug ] REGRESSION(r233667) Layout Test imported/w3c/web-platform-tests/web-animations/interfaces/DocumentTimeline/constructor.html is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=195233

            Bug ID: 195233
           Summary: [ Mac WK2 iOS Debug ] REGRESSION(r233667) Layout Test
                    imported/w3c/web-platform-tests/web-animations/interfa
                    ces/DocumentTimeline/constructor.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 failing on Mac WK2 + iOS Debug

imported/w3c/web-platform-tests/web-animations/interfaces/DocumentTimeline/constructor.html

Probable cause:

Test was modified in r233667, is 100% failure before that revision and is a flaky failure since it was changed.

Reproducible with:

run-webkit-tests imported/w3c/web-platform-tests/web-animations/interfaces/DocumentTimeline/constructor.html --iterations 5000 -f --exit-after-n-failures=5

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=imported%2Fw3c%2Fweb-platform-tests%2Fweb-animations%2Finterfaces%2FDocumentTimeline%2Fconstructor.html

Diff: 

--- /Volumes/Data/slave/mojave-release-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/web-animations/interfaces/DocumentTimeline/constructor-expected.txt
+++ /Volumes/Data/slave/mojave-release-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/web-animations/interfaces/DocumentTimeline/constructor-actual.txt
@@ -1,5 +1,5 @@

-PASS An origin time of zero is used when none is supplied 
+FAIL An origin time of zero is used when none is supplied assert_approx_equals: expected 30 +/- 0.001 but got 15
 PASS A zero origin time produces a document timeline with a current time identical to the default document timeline 
 PASS A positive origin time makes the document timeline's current time lag behind the default document timeline 
 PASS A negative origin time makes the document timeline's current time run ahead of the default document timeline

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