[issue7780] unittest: allow an 'import_path' as an alternative to 'top_level_dir' in test discover

[Michael Foord]

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

My suggestion is that test discovery should first try the argument as a directory. If that fails try it as a dotted name by importing it. If the import succeeds discovery can start from the directory containing the imported package.

If a module rather than a package is specified as a dotted name argument to test discovery then we can either just run the tests in that module or raise an error?

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<http://bugs.python.org/issue7780>
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