text: from unittest import mock
  
  from pre_commit.languages import docker
  
  
  def test_docker_fallback_user():
      def invalid_attribute():
          raise AttributeError
      with mock.patch.multiple(
          'os', create=True,
          getuid=invalid_attribute,
          getgid=invalid_attribute,
      ):
          assert docker.get_docker_user() == ()
  