[issue16510] Using appropriate checks in tests

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I understand this.  I checked the patch few times, with long (more than a month) intervals between inspections.  If someone wants to modernize some tests, he can turn to this patch for reference.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16510>
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