The importlib test checks that there is no package called 'pkg', which is not true on OmniOS. diff -wpruN --no-dereference '--exclude=*.orig' a~/Lib/test/test_importlib/metadata/test_api.py a/Lib/test/test_importlib/metadata/test_api.py --- a~/Lib/test/test_importlib/metadata/test_api.py 1970-01-01 00:00:00 +++ a/Lib/test/test_importlib/metadata/test_api.py 1970-01-01 00:00:00 @@ -59,7 +59,7 @@ class APITests( assert distribution(name).metadata['Name'] == 'pkg.dot' def test_prefix_not_matched(self): - prefixes = 'p', 'pkg', 'pkg.' + prefixes = 'p', 'qkg', 'qkg.' for prefix in prefixes: with self.subTest(prefix): with self.assertRaises(PackageNotFoundError):