[Webkit-unassigned] [Bug 148149] New: Fix a rare flakiness in svg/animations/svgPreserveAspectRatio-animation-1.html

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=148149

            Bug ID: 148149
           Summary: Fix a rare flakiness in
                    svg/animations/svgPreserveAspectRatio-animation-1.html
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: SVG
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sabouhallawa at apple.com
                CC: zimmermann at kde.org

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&showExpectations=true&revision=188590&tests=svg%2Fanimations%2FsvgPreserveAspectRatio-animation-1.html 

FAIL rootSVGElement.preserveAspectRatio.animVal.align should be 2. Was 7.
FAIL rootSVGElement.preserveAspectRatio.animVal.meetOrSlice should be 1. Was 2.

shows that the test is somehow flaky. After looking at the failure results. Here is what is happening:

1. The preserveAspectRatio of the SVG root element is set initially to "xMaxYMin meet".
2. An animation element is created to animate the preserveAspectRatio from "xMinYMin meet" to "xMaxYMid slice" in 4s.
3. The script svg/animations/resources/SVGAnimationTestCase.js fakes the animation to able to sample the changes in the animated attributes. It works by splitting the animation period in two halves. The first half the attribute value is set to the from-value and the second half the attribute value is set to the to-value. In this test case the animation period is 4s. So the first two second preserveAspectRatio = "xMinYMin meet" and the last two seconds preserveAspectRatio from "xMaxYMid slice".
4. We are sampling the animation exactly at the 2.0 seconds which is the time the change in the animated value happens. The expected file is assuming preserveAspectRatio to be the from-value ("xMinYMin meet" or "2 1"). But the failure results shows that its value is the to-value ("xMaxYMid slice" or "7 2").

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