Fix a rare flakiness in svg/animations/svgPreserveAspectRatio-animation-1.html

• Component: SVG
• Status: RESOLVED FIXED

[Said Abou-Hallawa]

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").

[Said Abou-Hallawa]

Created attachment 259306 [details]
Patch

[WebKit Commit Bot]

Comment on attachment 259306 [details]
Patch

Clearing flags on attachment: 259306

Committed r188613: <http://trac.webkit.org/changeset/188613>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.