[issue26859] unittest fails with "Start directory is not importable" when trying to run sourceless tests

[Xavier de Gaye]

Xavier de Gaye added the comment:

> the list_dir() nested function is never called
Verifying that load_tests is called is the purpose of this test. In this case should_recurse is false in _find_tests() and os.listdir() is not invoked by this method.

This new patch does not use vfs and list_dir and uses subtests to also check that TestLoader.discover() does consider that a path refers to a package directory when it contains an '__init__.pyc' file and no '__init__.py' file, and vice-versa.

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Added file: http://bugs.python.org/file43507/unittest_3.patch

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<http://bugs.python.org/issue26859>
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