[issue16510] Using appropriate checks in tests

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Patch updated to sync with tip. It is 5% less than first version because some changes already applied in other commits.

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Added file: http://bugs.python.org/file31505/tests_asserts_2.patch

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