[Python-Dev] I need help with IO testuite

[Jesus Cea]

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Hi all. I am modifying IO module for Python 3.2, and I am unable to
understand the mechanism used in IO testsuite to test both the C and the
Python implementation.

In particular I need to test that the implementation passes some
parameters to the OS.

The module uses "Mock" classes, but I think "Mock" is something else,
and I don't see how it interpose between the C/Python code and the OS.

If somebody could explain the mechanism a bit...

Thanks for your time and attention.

Some background: http://bugs.python.org/issue10142

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