[issue3643] Add more checks to testcapi

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Unless someone thinks it's somehow release-critical, I'm retargetting
this to 2.7/3.1.

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nosy: +pitrou
versions: +Python 2.7, Python 3.1 -Python 2.6, Python 3.0

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<http://bugs.python.org/issue3643>
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