Bug 196298 – [iOS WK2] fast/viewport/ios/use-minimum-device-width-for-page-without-viewport-meta.html is a flaky failure

• Status: RESOLVED
• Resolution: FIXED
• Component: Tools / Tests

[Shawn Roberts]

The following layout test is failing on iOS Simulator Release WK2

fast/viewport/ios/use-minimum-device-width-for-page-without-viewport-meta.html

Probable cause:

Test has been a flaky failure since the test was added in https://trac.webkit.org/changeset/238946/webkit . Failing around 4 times on average in 500 iterations from r238946 up until r240911

Changes made in https://trac.webkit.org/changeset/240912/webkit made test fail a lot more frequently. During testing found from 240912 up until current r243537 is failing approximately 10 times 60 attempts (setting testing to exit after 10 failures)

Reproduced with : 

run-webkit-tests fast/viewport/ios/use-minimum-device-width-for-page-without-viewport-meta.html --iterations 500 -f --ios-simulator --exit-after-n-failures=10

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=fast%2Fviewport%2Fios%2Fuse-minimum-device-width-for-page-without-viewport-meta.html

--- /Volumes/Data/slave/ios-simulator-12-release-tests-wk2/build/layout-test-results/fast/viewport/ios/use-minimum-device-width-for-page-without-viewport-meta-expected.txt
+++ /Volumes/Data/slave/ios-simulator-12-release-tests-wk2/build/layout-test-results/fast/viewport/ios/use-minimum-device-width-for-page-without-viewport-meta-actual.txt
@@ -1,7 +1,7 @@
 setMinimumEffectiveWidth(640.00)
-window size: [640, 1096]
+window size: [320, 548]
 square size: [64, 110]
-zoom scale: 0.50
+zoom scale: 1.00
 
 setMinimumEffectiveWidth(768.00)
 window size: [768, 1315]

[Shawn Roberts]

Adding Yongjun Zhang who created the test.

Adding Simon Fraser who authored the change that made test more flaky.

[Radar WebKit Bug Importer]

<rdar://problem/49337021>

[Shawn Roberts]

Marked flaky in https://trac.webkit.org/changeset/243548/webkit

[Wenson Hsieh]

Created attachment 381963 [details]
Patch

[Wenson Hsieh]

Created attachment 381966 [details]
Fix a ChangeLog typo

[WebKit Commit Bot]

Comment on attachment 381966 [details]
Fix a ChangeLog typo

Clearing flags on attachment: 381966

Committed r251625: <https://trac.webkit.org/changeset/251625>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.