diff --git a/os_brick/tests/initiator/connectors/test_iscsi.py b/os_brick/tests/initiator/connectors/test_iscsi.py
index 4c936308b..00109bc82 100644
--- a/os_brick/tests/initiator/connectors/test_iscsi.py
+++ b/os_brick/tests/initiator/connectors/test_iscsi.py
@@ -702,8 +702,8 @@ class ISCSIConnectorTestCase(test_connector.ConnectorTestCase):
             force=False, ignore_errors=False,
             device_info=mock.sentinel.device_info)
 
-        get_dev_path_mock.called_once_with(self.CON_PROPS,
-                                           mock.sentinel.device_info)
+        get_dev_path_mock.assert_called_once_with(self.CON_PROPS,
+                                                  mock.sentinel.device_info)
         con_devs_mock.assert_called_once_with(self.CON_PROPS,
                                               mock.sentinel.ips_iqns_luns,
                                               False)
diff --git a/os_brick/tests/initiator/connectors/test_nvmeof.py b/os_brick/tests/initiator/connectors/test_nvmeof.py
index e75f81152..f14e626c9 100644
--- a/os_brick/tests/initiator/connectors/test_nvmeof.py
+++ b/os_brick/tests/initiator/connectors/test_nvmeof.py
@@ -1430,10 +1430,10 @@ class NVMeOFConnectorTestCase(test_connector.ConnectorTestCase):
         mock_find_dev.assert_called_once_with()
 
         portal = target.portals[-1]
-        mock_cli.called_once_with(['connect', '-a', portal.address,
-                                   '-s', portal.port, '-t', portal.transport,
-                                   '-n', target.nqn, '-Q', '128', '-l', '-1',
-                                   '-q', 'host_nqn'])
+        mock_cli.assert_called_once_with([
+            'connect', '-a', portal.address, '-s', portal.port, '-t',
+            portal.transport, '-n', target.nqn, '-Q', '128', '-l', '-1',
+            '-q', 'host_nqn'])
 
     @mock.patch.object(nvmeof.NVMeOFConnector, '_do_multipath',
                        mock.Mock(return_value=True))
@@ -1497,9 +1497,9 @@ class NVMeOFConnectorTestCase(test_connector.ConnectorTestCase):
         mock_find_dev.assert_called_once_with()
 
         portal = target.portals[-1]
-        mock_cli.called_once_with(['connect', '-a', portal.address,
-                                   '-s', portal.port, '-t', portal.transport,
-                                   '-n', target.nqn, '-Q', '128', '-l', '-1'])
+        mock_cli.assert_called_once_with([
+            'connect', '-a', portal.address, '-s', portal.port, '-t',
+            portal.transport, '-n', target.nqn, '-Q', '128', '-l', '-1'])
         self.assertEqual(1, mock_log.call_count)
 
     @mock.patch.object(nvmeof.NVMeOFConnector, 'stop_and_assemble_raid')
diff --git a/os_brick/tests/initiator/connectors/test_rbd.py b/os_brick/tests/initiator/connectors/test_rbd.py
index b49683e02..935cafc8c 100644
--- a/os_brick/tests/initiator/connectors/test_rbd.py
+++ b/os_brick/tests/initiator/connectors/test_rbd.py
@@ -358,8 +358,8 @@ class RBDConnectorTestCase(test_base_rbd.RBDConnectorTestMixin,
         rbd_connector.disconnect_volume(conn, None)
 
         # Assert that only showmapped is called when no mappings are found
-        mock_execute.called_once_with(*show_cmd, root_helper=None,
-                                      run_as_root=True)
+        mock_execute.assert_called_once_with(*show_cmd, root_helper=None,
+                                             run_as_root=True)
 
     @mock.patch.object(priv_rootwrap, 'execute', return_value=None)
     def test_disconnect_local_volume_no_mappings(self, mock_execute):
@@ -374,8 +374,8 @@ class RBDConnectorTestCase(test_base_rbd.RBDConnectorTestMixin,
         rbd_connector.disconnect_volume(conn, None)
 
         # Assert that only showmapped is called when no mappings are found
-        mock_execute.called_once_with(*show_cmd, root_helper=None,
-                                      run_as_root=True)
+        mock_execute.assert_called_once_with(*show_cmd, root_helper=None,
+                                             run_as_root=True)
 
     @mock.patch('oslo_utils.fileutils.delete_if_exists')
     @mock.patch.object(rbd.RBDConnector, '_get_rbd_handle')