[issue6001] Test discovery for unittest

[Michael Foord]

Michael Foord <michael at voidspace.org.uk> added the comment:

Updated patch with documentation and fixed command line usage message.

Unless there are objections I intend to check this in in the next few
days. It would be helpful if someone else could go over the
documentation and check for errors / typos etc.

I've already had feedback from a few folks. The only suggestions so far
have been:

* Instead of a discover method the functionality could be built into
TestLoader.loadTestsFromPath. This would be a substantial change and I
think it better belongs in a new method.
* discover could simply load all modules and discover TestCases instead
of needing a pattern to filter on. I think filtering is an important
feature (not least for performance and because importing arbitrary
modules is not safe). Loading all modules can be had by passing in a
pattern of '*'

The behavior as implemented is a subset of the test discovery provided
by frameworks like nose (which doesn't require all test modules to be
importable from the top level).

The load_tests protocol is an idea already in use by the Bzr test
framework and similar protocols are in use in other frameworks.

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Added file: http://bugs.python.org/file14052/test_discovery.patch

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