[issue14817] pkgutil.extend_path has no tests

[Windson Yang]

Windson Yang <wiwindson at outlook.com> added the comment:

I added some tests in the PR. Actually, there are some tests for extend_path already (see https://github.com/python/cpython/blob/master/Lib/test/test_pkgutil.py#L235). However, I didn't test every line of the code in the extend_path function.

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<https://bugs.python.org/issue14817>
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