diff --git a/karbor/tests/unit/clients/test_k8s_client.py b/karbor/tests/unit/clients/test_k8s_client.py
index 139867b9..a5d3fd46 100644
--- a/karbor/tests/unit/clients/test_k8s_client.py
+++ b/karbor/tests/unit/clients/test_k8s_client.py
@@ -16,8 +16,6 @@ from karbor.context import RequestContext
 from karbor.services.protection.clients import k8s
 from karbor.tests import base
 
-import mock
-
 
 class KubernetesClientTest(base.TestCase):
     def setUp(self):
@@ -43,8 +41,7 @@ class KubernetesClientTest(base.TestCase):
                                '/etc/provider.d/client-admin.key',
                                'k8s_client')
 
-    @mock.patch('kubernetes.client.api_client.ApiClient.__del__')
-    def test_create_client(self, mock_k8s_delete):
+    def test_create_client(self):
 
         client = k8s.create(self._context, self.conf)
         self.assertEqual(client.api_client.configuration.host, self.host_url)
diff --git a/karbor/tests/unit/plugins/test_pod_protectable_plugin.py b/karbor/tests/unit/plugins/test_pod_protectable_plugin.py
index 34de52fc..7eb605c5 100644
--- a/karbor/tests/unit/plugins/test_pod_protectable_plugin.py
+++ b/karbor/tests/unit/plugins/test_pod_protectable_plugin.py
@@ -46,10 +46,9 @@ class PodProtectablePluginTest(base.TestCase):
         self.assertEqual(("OS::Keystone::Project"),
                          plugin.get_parent_resource_types())
 
-    @mock.patch('kubernetes.client.api_client.ApiClient.__del__')
     @mock.patch('kubernetes.client.apis.core_v1_api.'
                 'CoreV1Api.list_namespaced_pod')
-    def test_list_resources(self, mock_pod_list, mock_pod_delete):
+    def test_list_resources(self, mock_pod_list):
         plugin = K8sPodProtectablePlugin(self._context, cfg.CONF)
 
         pod = V1Pod(api_version="v1", kind="Pod",
@@ -66,10 +65,9 @@ class PodProtectablePluginTest(base.TestCase):
                      'default:busybox-test')],
             plugin.list_resources(self._context))
 
-    @mock.patch('kubernetes.client.api_client.ApiClient.__del__')
     @mock.patch('kubernetes.client.apis.core_v1_api.'
                 'CoreV1Api.read_namespaced_pod')
-    def test_show_resource(self, mock_pod_get, mock_pod_delete):
+    def test_show_resource(self, mock_pod_get):
         plugin = K8sPodProtectablePlugin(self._context, cfg.CONF)
 
         pod = V1Pod(api_version="v1", kind="Pod",
diff --git a/karbor/tests/unit/plugins/test_volume_protectable_plugin.py b/karbor/tests/unit/plugins/test_volume_protectable_plugin.py
index 51cc04b5..4addab44 100644
--- a/karbor/tests/unit/plugins/test_volume_protectable_plugin.py
+++ b/karbor/tests/unit/plugins/test_volume_protectable_plugin.py
@@ -151,7 +151,6 @@ class VolumeProtectablePluginTest(base.TestCase):
                       {'availability_zone': 'az1'})],
             plugin.get_dependent_resources(self._context, project))
 
-    @mock.patch('kubernetes.client.api_client.ApiClient.__del__')
     @mock.patch.object(volumes.VolumeManager, 'list')
     @mock.patch('kubernetes.client.apis.core_v1_api.'
                 'CoreV1Api.read_persistent_volume')
@@ -162,8 +161,7 @@ class VolumeProtectablePluginTest(base.TestCase):
     def test_get_pod_dependent_resources(self, mock_pod_read,
                                          mock_pvc_read,
                                          mock_pv_read,
-                                         mock_volume_list,
-                                         mock_delete):
+                                         mock_volume_list):
         plugin = VolumeProtectablePlugin(self._context)
 
         pod = V1Pod(api_version="v1", kind="Pod",
diff --git a/karbor/tests/unit/protection/test_pod_protection_plugin.py b/karbor/tests/unit/protection/test_pod_protection_plugin.py
index d76e2748..e94684de 100644
--- a/karbor/tests/unit/protection/test_pod_protection_plugin.py
+++ b/karbor/tests/unit/protection/test_pod_protection_plugin.py
@@ -131,9 +131,8 @@ class PodProtectionPluginTest(base.TestCase):
         self.assertEqual(options_schema,
                          pod_plugin_schemas.SAVED_INFO_SCHEMA)
 
-    @mock.patch('kubernetes.client.api_client.ApiClient.__del__')
     @mock.patch('karbor.services.protection.clients.k8s.create')
-    def test_create_backup(self, mock_k8s_create, mock_k8s_delete):
+    def test_create_backup(self, mock_k8s_create):
         self.k8s_client = client_factory.ClientFactory.create_client(
             "k8s", self.cntxt)
         resource = Resource(id="c88b92a8-e8b4-504c-bad4-343d92061871",