[PATCH] dwrite/tests: Add traces to allow debugging font failures.

[Nikolay Sivov]

Does any of those tests actually fail? Index access for family/font 
objects should never fail for valid index, other tests you changed might 
but on extreme conditions like allocations errors and such. I think 
additional trace() calls are not great, and should instead print 
family/face names for failed tests directly, from ok() calls. Tracing 
indices also becomes useless when you normally run without verbose mode.

I would be interested in fixing failures you're seeing though, and I 
don't see anything new on the test page.