Comment #4 on issue 21611 by minyu.huang: Generate complete unit tests for  
printing related classes.
http://code.google.com/p/chromium/issues/detail?id=21611

The unit test for PdfPsMetafile only tests the generation of Cairo  
surfaces. We
actually need to draw something on the surface and see if the results are  
correct. We
did not have unit tests for VectorCanvas/VectorPlatformDevice. We need to  
check if
the rendering results are correct. For example, Can draw curves correctly?  
Does the
image composition work? Does clipping work correctly?

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