code: def test_unique_id_with_flag(self):
      with mock.patch.object(paths, "ACME_ID") as mock_acme_id:
          mock_acme_id.value = "test_flag"
          self.assertEqual(paths.get_unique_id(), ("test_flag",))
  
file_path: acme/acme/utils/paths_test.py
imports: from unittest import mock
  from acme.testing import test_utils
  import acme.utils.paths
  from absl.testing import absltest
label_desc: Use image node_id 2 for calling the PathTest obj's underlying member method code with example usage: obj.test_unique_id_with_flag() without return types