[issue1959] test_contains.py converted to unittest

[Giampaolo Rodola']

Giampaolo Rodola' added the comment:

The diff file in attachment was generated by using TortoiseSVN and it
seems to be different than using "svn diff".
The new diff file is in attachment.

Added file: http://bugs.python.org/file9364/test_contains.diff

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