[Webkit-unassigned] [Bug 85689] New: layoutTestController.overridePreference doesn't work so well in a parallel world

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=85689

           Summary: layoutTestController.overridePreference doesn't work
                    so well in a parallel world
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: dino at apple.com


Sometimes setting a preference causes a default to be written for the DumpRenderTree process (e.g. on OSX). Unfortunately if you're explicitly testing for disabling a feature by a preference override, this can go crazy when there are multiple tests running at the same time. The tests that are expected to run while the feature is enabled may fail because the other test has temporarily turned it off. Also, this state seems to confuse the automatic reset of preferences.

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