[issue18919] Unify audio modules tests

[Ned Deily]

Ned Deily added the comment:

The new tests fail when run from an installed Python.  You also need to add all of the new test directories to LIBSUBDIRS for the libinstall target in Makefile.pre.in.

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nosy: +ned.deily

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<http://bugs.python.org/issue18919>
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