[issue20069] Add unit test for os.chown

[Claudiu Popa]

Claudiu Popa added the comment:

os.chown is not available on Windows. But maybe pwd can't be built on any Unix system, so not using import_module is okay.

"=> I can not because assertRaisesRegex can not be used with "with" statement."

Not true (see https://docs.python.org/3/library/unittest.html?highlight=assertraisesregex#unittest.TestCase.assertRaisesRegex).

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