This is apparently expected behavior (since empty results were checked in for mac when the test was originally added in http://trac.webkit.org/changeset/109953), but I don't understand why. On Mountain Lion, there is actually a layer tree printed: http://build.webkit.org/results/Apple%20MountainLion%20Debug%20WK2%20(Tests)/r127318%20(503)/css3/filters/composited-during-animation-layertree-pretty-diff.html --- /Volumes/Data/slave/mountainlion-debug-tests-wk2/build/layout-test-results/css3/filters/composited-during-animation-layertree-expected.txt +++ /Volumes/Data/slave/mountainlion-debug-tests-wk2/build/layout-test-results/css3/filters/composited-during-animation-layertree-actual.txt @@ -2,4 +2,34 @@ +(GraphicsLayer + (bounds 800.00 600.00) + (children 1 + (GraphicsLayer + (bounds 800.00 600.00) + (children 4 + (GraphicsLayer + (position 18.00 18.00) + (bounds 160.00 90.00) + (drawsContent 1) + ) + (GraphicsLayer + (position 18.00 132.00) + (bounds 160.00 90.00) + (drawsContent 1) + ) + (GraphicsLayer + (position 18.00 246.00) + (bounds 160.00 90.00) + (drawsContent 1) + ) + (GraphicsLayer + (position 18.00 360.00) + (bounds 160.00 90.00) + (drawsContent 1) + ) + ) + ) + ) +) Why are we expecting empty results on Lion? Is some feature not on in Lion? I am going to add the expected results for ML and move the empty results to mac-lion to get the bots greener.
<rdar://problem/12229951>
This test sometimes (rarely) produces empty results on all Mountain Lion bots (WK1 and WK2). Also, I can reproduce getting empty results every time when it's run repeatedly: $ run-webkit-tests css3/filters/composited-during-animation-layertree.html --repeat-each 100 … [2/100] css3/filters/composited-during-animation-layertree.html failed unexpectedly (text diff) [3/100] css3/filters/composited-during-animation-layertree.html failed unexpectedly (text diff) [4/100] css3/filters/composited-during-animation-layertree.html failed unexpectedly (text diff) [5/100] css3/filters/composited-during-animation-layertree.html failed unexpectedly (text diff) [6/100] css3/filters/composited-during-animation-layertree.html failed unexpectedly (text diff) … Marked as flaky in <http://trac.webkit.org/r157625>.
GLIB ports (WebKitGTK and WPE) produce similar results (https://bugs.webkit.org/show_bug.cgi?id=171600). The general baseline is empty. Isn't that a mistake? https://github.com/WebKit/WebKit/blob/main/LayoutTests/css3/filters/composited-during-animation-layertree-expected.txt