[Webkit-unassigned] [Bug 55746] New: [NRWT] Clear output image file used by DRT to make sure the previous result should not be used.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=55746

           Summary: [NRWT] Clear output image file used by DRT to make
                    sure the previous result should not be used.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: hayato at chromium.org
                CC: dpranke at chromium.org, mihaip at chromium.org


We need to clear output image before calling DRT in ChromiumDriver's run_test() in chromium.py.

In current implementation, the previous test's result might be returned when DRT crashes.

Because WebKitDriver in webkit.py seems to return '' as image when crash occurs, ChromiumDriver should do the same thing.

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