[issue10967] move regrtest over to using more unittest infrastructure

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

I also would put increasing test coverage at a higher priority, but this sort of refactoring can be a good step in the development path of new contributors, and doing it does decrease the future maintenance burden.

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<http://bugs.python.org/issue10967>
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