diff --git a/tempest/api/compute/servers/test_server_actions.py b/tempest/api/compute/servers/test_server_actions.py
index ec7b505..9fc5af0 100644
--- a/tempest/api/compute/servers/test_server_actions.py
+++ b/tempest/api/compute/servers/test_server_actions.py
@@ -393,7 +393,7 @@
         resp = self.client.create_backup(self.server_id,
                                          backup_type='daily',
                                          rotation=2,
-                                         name=backup1).response
+                                         name=backup1)
         oldest_backup_exist = True
 
         # the oldest one should be deleted automatically in this test
@@ -409,10 +409,10 @@
                                 "deleted during rotation.", oldest_backup)
 
         if api_version_utils.compare_version_header_to_response(
-                "OpenStack-API-Version", "compute 2.45", resp, "lt"):
+                "OpenStack-API-Version", "compute 2.45", resp.response, "lt"):
             image1_id = resp['image_id']
         else:
-            image1_id = data_utils.parse_image_id(resp['location'])
+            image1_id = data_utils.parse_image_id(resp.response['location'])
         self.addCleanup(_clean_oldest_backup, image1_id)
         waiters.wait_for_image_status(glance_client,
                                       image1_id, 'active')
@@ -422,12 +422,12 @@
         resp = self.client.create_backup(self.server_id,
                                          backup_type='daily',
                                          rotation=2,
-                                         name=backup2).response
+                                         name=backup2)
         if api_version_utils.compare_version_header_to_response(
-                "OpenStack-API-Version", "compute 2.45", resp, "lt"):
+                "OpenStack-API-Version", "compute 2.45", resp.response, "lt"):
             image2_id = resp['image_id']
         else:
-            image2_id = data_utils.parse_image_id(resp['location'])
+            image2_id = data_utils.parse_image_id(resp.response['location'])
         self.addCleanup(glance_client.delete_image, image2_id)
         waiters.wait_for_image_status(glance_client,
                                       image2_id, 'active')
@@ -465,12 +465,12 @@
         resp = self.client.create_backup(self.server_id,
                                          backup_type='daily',
                                          rotation=2,
-                                         name=backup3).response
+                                         name=backup3)
         if api_version_utils.compare_version_header_to_response(
-                "OpenStack-API-Version", "compute 2.45", resp, "lt"):
+                "OpenStack-API-Version", "compute 2.45", resp.response, "lt"):
             image3_id = resp['image_id']
         else:
-            image3_id = data_utils.parse_image_id(resp['location'])
+            image3_id = data_utils.parse_image_id(resp.response['location'])
         self.addCleanup(glance_client.delete_image, image3_id)
         # the first back up should be deleted
         waiters.wait_for_server_status(self.client, self.server_id, 'ACTIVE')
diff --git a/tempest/api/identity/admin/v3/test_roles.py b/tempest/api/identity/admin/v3/test_roles.py
index 69cac33..62ced19 100644
--- a/tempest/api/identity/admin/v3/test_roles.py
+++ b/tempest/api/identity/admin/v3/test_roles.py
@@ -384,12 +384,23 @@
 
         rules = self.roles_client.list_all_role_inference_rules()[
             'role_inferences']
+
+        # NOTE(jaosorior): With the work related to the define-default-roles
+        # blueprint, we now have 'admin', 'member' and 'reader' by default. So
+        # we filter every other implied role to only take into account the ones
+        # relates to this test.
+        relevant_roles = (self.roles[0]['id'], self.roles[1]['id'],
+                          self.roles[2]['id'], self.role['id'])
+
+        def is_implied_role_relevant(rule):
+            return any(r for r in rule['implies'] if r['id'] in relevant_roles)
+
+        relevant_rules = filter(is_implied_role_relevant, rules)
         # Sort the rules by the number of inferences, since there should be 1
         # inference between "roles[2]" and "role" and 2 inferences for
         # "roles[0]": between "roles[1]" and "roles[2]".
-        sorted_rules = sorted(rules, key=lambda r: len(r['implies']))
+        sorted_rules = sorted(relevant_rules, key=lambda r: len(r['implies']))
 
-        # Check that 2 sets of rules are returned.
         self.assertEqual(2, len(sorted_rules))
         # Check that only 1 inference rule exists between "roles[2]" and "role"
         self.assertEqual(1, len(sorted_rules[0]['implies']))
diff --git a/tempest/tests/common/test_waiters.py b/tempest/tests/common/test_waiters.py
index eb1e2b6..938d226 100644
--- a/tempest/tests/common/test_waiters.py
+++ b/tempest/tests/common/test_waiters.py
@@ -75,61 +75,76 @@
 
 
 class TestInterfaceWaiters(base.TestCase):
-    def setUp(self):
-        super(TestInterfaceWaiters, self).setUp()
-        self.client = mock.MagicMock()
-        self.client.build_timeout = 1
-        self.client.build_interval = 1
 
-    def _port_down(self):
-        return {'interfaceAttachment': {'port_state': 'DOWN'}}
+    build_timeout = 1.
+    build_interval = 1
+    port_down = {'interfaceAttachment': {'port_state': 'DOWN'}}
+    port_active = {'interfaceAttachment': {'port_state': 'ACTIVE'}}
 
-    def _port_active(self):
-        return {'interfaceAttachment': {'port_state': 'ACTIVE'}}
+    def mock_client(self, **kwargs):
+        return mock.MagicMock(
+            build_timeout=self.build_timeout,
+            build_interval=self.build_interval,
+            **kwargs)
 
     def test_wait_for_interface_status(self):
-        self.client.show_interface.side_effect = [self._port_down(),
-                                                  self._port_active()]
-        with mock.patch.object(time, 'sleep') as sleep_mock:
-            start_time = int(time.time())
-            waiters.wait_for_interface_status(self.client, 'server_id',
-                                              'port_id', 'ACTIVE')
-            end_time = int(time.time())
-            self.assertLess(end_time, (start_time + self.client.build_timeout))
-            sleep_mock.assert_called_once_with(self.client.build_interval)
+        show_interface = mock.Mock(
+            side_effect=[self.port_down, self.port_active])
+        client = self.mock_client(show_interface=show_interface)
+        self.patch('time.time', return_value=0.)
+        sleep = self.patch('time.sleep')
+
+        result = waiters.wait_for_interface_status(
+            client, 'server_id', 'port_id', 'ACTIVE')
+
+        self.assertIs(self.port_active['interfaceAttachment'], result)
+        show_interface.assert_has_calls([mock.call('server_id', 'port_id'),
+                                         mock.call('server_id', 'port_id')])
+        sleep.assert_called_once_with(client.build_interval)
 
     def test_wait_for_interface_status_timeout(self):
-        time_mock = self.patch('time.time')
-        time_mock.side_effect = utils.generate_timeout_series(1)
+        show_interface = mock.MagicMock(return_value=self.port_down)
+        client = self.mock_client(show_interface=show_interface)
+        self.patch('time.time', side_effect=[0., client.build_timeout + 1.])
+        sleep = self.patch('time.sleep')
 
-        self.client.show_interface.return_value = self._port_down()
         self.assertRaises(lib_exc.TimeoutException,
                           waiters.wait_for_interface_status,
-                          self.client, 'server_id', 'port_id', 'ACTIVE')
+                          client, 'server_id', 'port_id', 'ACTIVE')
 
-    def _one_interface(self):
-        return {'interfaceAttachments': [{'port_id': 'port_one'}]}
+        show_interface.assert_has_calls([mock.call('server_id', 'port_id'),
+                                         mock.call('server_id', 'port_id')])
+        sleep.assert_called_once_with(client.build_interval)
 
-    def _two_interfaces(self):
-        return {'interfaceAttachments': [{'port_id': 'port_one'},
-                                         {'port_id': 'port_two'}]}
+    one_interface = {'interfaceAttachments': [{'port_id': 'port_one'}]}
+    two_interfaces = {'interfaceAttachments': [{'port_id': 'port_one'},
+                                               {'port_id': 'port_two'}]}
 
     def test_wait_for_interface_detach(self):
-        self.client.list_interfaces.side_effect = [self._two_interfaces(),
-                                                   self._one_interface()]
-        with mock.patch.object(time, 'sleep') as sleep_mock:
-            start_time = int(time.time())
-            waiters.wait_for_interface_detach(self.client, 'server_id',
-                                              'port_two')
-            end_time = int(time.time())
-            self.assertLess(end_time, (start_time + self.client.build_timeout))
-            sleep_mock.assert_called_once_with(self.client.build_interval)
+        list_interfaces = mock.MagicMock(
+            side_effect=[self.two_interfaces, self.one_interface])
+        client = self.mock_client(list_interfaces=list_interfaces)
+        self.patch('time.time', return_value=0.)
+        sleep = self.patch('time.sleep')
+
+        result = waiters.wait_for_interface_detach(
+            client, 'server_id', 'port_two')
+
+        self.assertIs(self.one_interface['interfaceAttachments'], result)
+        list_interfaces.assert_has_calls([mock.call('server_id'),
+                                          mock.call('server_id')])
+        sleep.assert_called_once_with(client.build_interval)
 
     def test_wait_for_interface_detach_timeout(self):
-        time_mock = self.patch('time.time')
-        time_mock.side_effect = utils.generate_timeout_series(1)
+        list_interfaces = mock.MagicMock(return_value=self.one_interface)
+        client = self.mock_client(list_interfaces=list_interfaces)
+        self.patch('time.time', side_effect=[0., client.build_timeout + 1.])
+        sleep = self.patch('time.sleep')
 
-        self.client.list_interfaces.return_value = self._one_interface()
         self.assertRaises(lib_exc.TimeoutException,
                           waiters.wait_for_interface_detach,
-                          self.client, 'server_id', 'port_one')
+                          client, 'server_id', 'port_one')
+
+        list_interfaces.assert_has_calls([mock.call('server_id'),
+                                          mock.call('server_id')])
+        sleep.assert_called_once_with(client.build_interval)