'Show that github3.enterprise_login returns GitHubEnterprise.'

def test_enterprise_login(self):

    args = ('login', 'password', None, 'https://url.com/', None)
    with mock.patch.object(github3.GitHubEnterprise, 'login') as login:
        g = github3.enterprise_login(*args)
        assert isinstance(g, github3.GitHubEnterprise)
        login.assert_called_once_with('login', 'password', None, None)
