def test_env_default(self):
        env = dict(
            ST_AUTH='auth',
            ST_USER='user',
            ST_KEY='key',
            OS_AUTH_URL='authurl',
            OS_USERNAME='username',
            OS_PASSWORD='password',
            OS_TENANT_NAME='tenant',
        )
        with mock.patch.dict('os.environ', env):
            assert zpm._guess_auth_version(self.args) == '1.0'