Write unittest for style method isInUse

[Marcos Paulo de souza]

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Hi people,

There is a test can I can look to understand how to create a test with
macros?

I want to write a unittest to
https://bugs.freedesktop.org/show_bug.cgi?id=70807, so I just need a
code pointer to write this test.

Thanks since now!

Regards,
    Marcos
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