[Webkit-unassigned] [Bug 139685] New: [iOS] REGRESSION (r174642): DumpRenderTree.app test may dump result twice

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=139685

            Bug ID: 139685
           Summary: [iOS] REGRESSION (r174642): DumpRenderTree.app test
                    may dump result twice
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: iOS
                OS: iOS 8.1
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dbates at webkit.org

When running layout tests for iOS today I noticed that occasionally many tests in directory LayoutTests/fast/dom would fail after test running test LayoutTests/fast/dom/gc-10.html. From briefly debugging, DumpRenderTree.app is dumping the test result twice for test LayoutTests/fast/dom/gc-10.html because a new load may starts after dump() is called. This makes run-webkit-tests confused (since it expects exactly one test result per test run) and leads to run-webkit-tests using the wrong actual result in the comparison with the expected test result. Specifically, run-webkit-tests compares the actual result of test t_(i - 1) to the expected result of test t_i for i > N once it becomes confused where N := "the index of a test that starts a new load after DumpRenderTree.app calls dump()".

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