diff --git a/magnum_cluster_api/tests/functional/test_driver.py b/magnum_cluster_api/tests/functional/test_driver.py
index e5025a6c..e564e139 100644
--- a/magnum_cluster_api/tests/functional/test_driver.py
+++ b/magnum_cluster_api/tests/functional/test_driver.py
@@ -12,6 +12,8 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+from unittest import mock
+
 import pytest
 from magnum import objects as magnum_objects  # type: ignore
 from magnum.objects import fields  # type: ignore
@@ -76,6 +78,7 @@ def _create_node_group(self, context, driver, node_group_name, cluster_template)
             status=fields.ClusterStatus.CREATE_IN_PROGRESS,
         )
         new_node_group.name = node_group_name
+        new_node_group.save = mock.MagicMock()
 
         self.cluster.status = fields.ClusterStatus.UPDATE_IN_PROGRESS
         driver.create_nodegroup(context, self.cluster, new_node_group)