Add explicit test for hg+file
This was previously failing on the master branch.
@@ -131,6 +131,7 @@ class TestLink:
@pytest.mark.parametrize('url, expected', [
('git+https://github.com/org/repo', True),
('bzr+http://bzr.myproject.org/MyProject/trunk/#egg=MyProject', True),
+ ('hg+file://hg.company.com/repo', True),
('https://example.com/some.whl', False),
('file://home/foo/some.whl', False),
])
