[issue18919] Unify audio modules tests

[R. David Murray]

R. David Murray added the comment:

It looks like test_wave is still failing on PPC64 PowerLinux:

http://buildbot.python.org/all/builders/PPC64%20PowerLinux%203.x/builds/850/steps/test/logs/stdio

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