[issue1951] test_wave.py converted to unittest

[Giampaolo Rodola']

Giampaolo Rodola' added the comment:

Sorry but I realized right now by reading Lib/test/readme.txt that the
test scripts are required to have a global "test_main()" function
defined hence the "main()" function I defined in my patch should be
renamed in "test_main()".

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