[issue16510] Using appropriate checks in tests

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

After chipping off yet some small separate issues, there are only 276 changed lines left in 80 files.

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Added file: http://bugs.python.org/file33984/tests_asserts_4.patch

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<http://bugs.python.org/issue16510>
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