'Test the basic usage of _vcs_split_rev_from_url'

def test__vcs_split_rev_from_url(self):

    vsrfu = setuptools.package_index.PackageIndex._vcs_split_rev_from_url
    (url, rev) = vsrfu('https://example.com/bar@2995')
    self.assertEqual(url, 'https://example.com/bar')
    self.assertEqual(rev, '2995')
