diff --git a/octavia_tempest_plugin/common/barbican_client_mgr.py b/octavia_tempest_plugin/common/barbican_client_mgr.py
index eba1715..3bd2807 100644
--- a/octavia_tempest_plugin/common/barbican_client_mgr.py
+++ b/octavia_tempest_plugin/common/barbican_client_mgr.py
@@ -73,7 +73,7 @@
         p12_secret.name = data_utils.rand_name("lb_member_barbican")
         p12_secret.payload = secret
         secret_ref = p12_secret.store()
-        LOG.debug('Secret {0} has ref {1}'.format(p12_secret.name, secret_ref))
+        LOG.debug('Secret %s has ref %s', p12_secret.name, secret_ref)
         return secret_ref
 
     def delete_secret(self, secret_ref):
@@ -84,5 +84,5 @@
                                                users=[user_id],
                                                project_access=True)
         acl_ref = acl_entity.submit()
-        LOG.debug('Secret ACL {0} added user {1}'.format(acl_ref, user_id))
+        LOG.debug('Secret ACL %s added user %s', acl_ref, user_id)
         return acl_ref
diff --git a/octavia_tempest_plugin/hacking/checks.py b/octavia_tempest_plugin/hacking/checks.py
index eec7476..7008994 100644
--- a/octavia_tempest_plugin/hacking/checks.py
+++ b/octavia_tempest_plugin/hacking/checks.py
@@ -66,8 +66,6 @@
 no_eventlet_re = re.compile(r'(import|from)\s+[(]?eventlet')
 no_line_continuation_backslash_re = re.compile(r'.*(\\)\n')
 no_logging_re = re.compile(r'(import|from)\s+[(]?logging')
-import_mock_re = re.compile(r"\bimport[\s]+mock\b")
-import_from_mock_re = re.compile(r"\bfrom[\s]+mock[\s]+import\b")
 
 
 def _translation_checks_not_enforced(filename):
@@ -147,7 +145,7 @@
     O339
     """
     if logical_line.startswith('LOG.warn('):
-        yield(0, "O339:Use LOG.warning() rather than LOG.warn()")
+        yield (0, "O339:Use LOG.warning() rather than LOG.warn()")
 
 
 @core.flake8ext
@@ -260,18 +258,3 @@
     if no_logging_re.match(logical_line):
         msg = 'O348 Usage of Python logging module not allowed, use oslo_log'
         yield logical_line.index('logging'), msg
-
-
-@core.flake8ext
-def check_no_import_mock(logical_line):
-    """O349 - Test code must not import mock library.
-
-    :param logical_line: The logical line to check.
-    :returns: None if the logical line passes the check, otherwise a tuple
-              is yielded that contains the offending index in logical line
-              and a message describe the check validation failure.
-    """
-    if (import_mock_re.match(logical_line) or
-            import_from_mock_re.match(logical_line)):
-        msg = 'O349 Test code must not import mock library, use unittest.mock'
-        yield 0, msg
diff --git a/octavia_tempest_plugin/tests/act_stdby_scenario/v2/test_active_standby.py b/octavia_tempest_plugin/tests/act_stdby_scenario/v2/test_active_standby.py
index e3f6338..66cb59b 100644
--- a/octavia_tempest_plugin/tests/act_stdby_scenario/v2/test_active_standby.py
+++ b/octavia_tempest_plugin/tests/act_stdby_scenario/v2/test_active_standby.py
@@ -69,7 +69,7 @@
                 floating_network_id=CONF.network.public_network_id,
                 port_id=port_id)
             floating_ip = result['floatingip']
-            LOG.info('lb1_floating_ip: {}'.format(floating_ip))
+            LOG.info('lb1_floating_ip: %s', floating_ip)
             cls.addClassResourceCleanup(
                 waiters.wait_for_not_found,
                 cls.lb_mem_float_ip_client.delete_floatingip,
diff --git a/octavia_tempest_plugin/tests/act_stdby_scenario/v2/test_active_standby_iptables.py b/octavia_tempest_plugin/tests/act_stdby_scenario/v2/test_active_standby_iptables.py
index e7dccb6..ce2c94f 100644
--- a/octavia_tempest_plugin/tests/act_stdby_scenario/v2/test_active_standby_iptables.py
+++ b/octavia_tempest_plugin/tests/act_stdby_scenario/v2/test_active_standby_iptables.py
@@ -76,7 +76,7 @@
                 floating_network_id=CONF.network.public_network_id,
                 port_id=port_id)
             floating_ip = result['floatingip']
-            LOG.info('lb1_floating_ip: {}'.format(floating_ip))
+            LOG.info('lb1_floating_ip: %s', floating_ip)
             cls.addClassResourceCleanup(
                 waiters.wait_for_not_found,
                 cls.lb_mem_float_ip_client.delete_floatingip,
diff --git a/octavia_tempest_plugin/tests/api/v2/test_listener.py b/octavia_tempest_plugin/tests/api/v2/test_listener.py
index cd320f4..06a6848 100644
--- a/octavia_tempest_plugin/tests/api/v2/test_listener.py
+++ b/octavia_tempest_plugin/tests/api/v2/test_listener.py
@@ -568,8 +568,8 @@
                 fs = e.resp_body.get('faultstring', '')
                 if ("Invalid input for field/attribute protocol." in fs
                         and "Value should be one of:" in fs):
-                    LOG.info("Skipping unsupported protocol: {}".format(
-                        listener_kwargs[const.PROTOCOL]))
+                    LOG.info("Skipping unsupported protocol: %s",
+                             listener_kwargs[const.PROTOCOL])
                 else:
                     raise e
             else:
@@ -598,8 +598,8 @@
                 fs = e.resp_body.get('faultstring', '')
                 if ("Invalid input for field/attribute protocol." in fs
                         and "Value should be one of:" in fs):
-                    LOG.info("Skipping unsupported protocol: {}".format(
-                        listener_kwargs[const.PROTOCOL]))
+                    LOG.info("Skipping unsupported protocol: %s",
+                             listener_kwargs[const.PROTOCOL])
                 else:
                     raise e
             else:
@@ -646,8 +646,8 @@
                 fs = e.resp_body.get('faultstring', '')
                 if ("Invalid input for field/attribute protocol." in fs
                         and "Value should be one of:" in fs):
-                    LOG.info("Skipping unsupported protocol: {}".format(
-                        listener_kwargs[const.PROTOCOL]))
+                    LOG.info("Skipping unsupported protocol: %s",
+                             listener_kwargs[const.PROTOCOL])
                 else:
                     raise e
             else:
diff --git a/octavia_tempest_plugin/tests/api/v2/test_member.py b/octavia_tempest_plugin/tests/api/v2/test_member.py
index 1e18af3..ed3fba6 100644
--- a/octavia_tempest_plugin/tests/api/v2/test_member.py
+++ b/octavia_tempest_plugin/tests/api/v2/test_member.py
@@ -29,6 +29,7 @@
 
 CONF = config.CONF
 
+
 # Member port numbers need to be unique on the shared pools so generate them
 @misc.singleton
 class MemberPort(object):
diff --git a/octavia_tempest_plugin/tests/barbican_scenario/v2/test_tls_barbican.py b/octavia_tempest_plugin/tests/barbican_scenario/v2/test_tls_barbican.py
index 3c92181..62be835 100644
--- a/octavia_tempest_plugin/tests/barbican_scenario/v2/test_tls_barbican.py
+++ b/octavia_tempest_plugin/tests/barbican_scenario/v2/test_tls_barbican.py
@@ -220,7 +220,7 @@
                 floating_network_id=CONF.network.public_network_id,
                 port_id=port_id)
             floating_ip = result['floatingip']
-            LOG.info('lb1_floating_ip: {}'.format(floating_ip))
+            LOG.info('lb1_floating_ip: %s', floating_ip)
             cls.addClassResourceCleanup(
                 waiters.wait_for_not_found,
                 cls.lb_mem_float_ip_client.delete_floatingip,
@@ -349,9 +349,9 @@
                 # Make sure the certificate is the one we generated
                 self.assertEqual(expected_cn, received_cn, message=msg)
             else:
-                LOG.error('Certificate with CN: {0} failed validation with '
-                          'OpenSSL verify errno {1}'.format(
-                              x509.get_subject().commonName, errno))
+                LOG.error('Certificate with CN: %s failed validation with '
+                          'OpenSSL verify errno %s',
+                          x509.get_subject().commonName, errno)
                 return False
             return True
 
@@ -487,9 +487,9 @@
                 # Make sure the certificate is the one we generated
                 self.assertEqual(expected_cn, received_cn, message=msg)
             else:
-                LOG.error('Certificate with CN: {0} failed validation with '
-                          'OpenSSL verify errno {1}'.format(
-                              x509.get_subject().commonName, errno))
+                LOG.error('Certificate with CN: %s failed validation with '
+                          'OpenSSL verify errno %s',
+                          x509.get_subject().commonName, errno)
                 return False
             return True
 
@@ -660,9 +660,9 @@
                 # Make sure the certificate is the one we generated
                 self.assertEqual(expected_cn, received_cn, message=msg)
             else:
-                LOG.error('Certificate with CN: {0} failed validation with '
-                          'OpenSSL verify errno {1}'.format(
-                              x509.get_subject().commonName, errno))
+                LOG.error('Certificate with CN: %s failed validation with '
+                          'OpenSSL verify errno %s',
+                          x509.get_subject().commonName, errno)
                 return False
             return True
 
diff --git a/octavia_tempest_plugin/tests/scenario/v2/test_traffic_ops.py b/octavia_tempest_plugin/tests/scenario/v2/test_traffic_ops.py
index 0083887..db92352 100644
--- a/octavia_tempest_plugin/tests/scenario/v2/test_traffic_ops.py
+++ b/octavia_tempest_plugin/tests/scenario/v2/test_traffic_ops.py
@@ -79,7 +79,7 @@
                 floating_network_id=CONF.network.public_network_id,
                 port_id=port_id)
             floating_ip = result['floatingip']
-            LOG.info('lb1_floating_ip: {}'.format(floating_ip))
+            LOG.info('lb1_floating_ip: %s', floating_ip)
             cls.addClassResourceCleanup(
                 waiters.wait_for_not_found,
                 cls.lb_mem_float_ip_client.delete_floatingip,
@@ -1351,7 +1351,7 @@
         test_url = 'http://{}:{}/request'.format(
             self.lb_vip_address, listener_port)
         data = self.validate_URL_response(test_url)
-        LOG.info('Received payload is: {}'.format(data))
+        LOG.info('Received payload is: %s', data)
 
         # Detect source IP that is used to create TCP socket toward LB_VIP.
         try:
@@ -1398,7 +1398,7 @@
 
         # Initiate HTTP traffic
         data = self.validate_URL_response(test_url)
-        LOG.info('Received payload is: {}'.format(data))
+        LOG.info('Received payload is: %s', data)
         expected_headers = {const.X_FORWARDED_PORT: '{}'.format(
             listener_port), const.X_FORWARDED_PROTO: const.HTTP.lower()}
         received_headers = _data_parser(data, expected_headers)
@@ -1550,7 +1550,7 @@
         # For each test case, update HM and validate that members'
         # "Operation Status" is changed to expected value.
         for ff in flip_flop:
-            LOG.info('Tested test case is: {}'.format(ff))
+            LOG.info('Tested test case is: %s', ff)
             self.mem_healthmonitor_client.update_healthmonitor(
                 hm_id, expected_codes=ff['code'], http_method=ff['mthd'],
                 url_path=ff['url_path'])
diff --git a/octavia_tempest_plugin/tests/spare_pool_scenario/v2/test_spare_pool.py b/octavia_tempest_plugin/tests/spare_pool_scenario/v2/test_spare_pool.py
index 0ccfe55..26866c3 100644
--- a/octavia_tempest_plugin/tests/spare_pool_scenario/v2/test_spare_pool.py
+++ b/octavia_tempest_plugin/tests/spare_pool_scenario/v2/test_spare_pool.py
@@ -82,7 +82,7 @@
                 floating_network_id=CONF.network.public_network_id,
                 port_id=port_id)
             floating_ip = result['floatingip']
-            LOG.info('lb1_floating_ip: {}'.format(floating_ip))
+            LOG.info('lb1_floating_ip: %s', floating_ip)
             self.addClassResourceCleanup(
                 waiters.wait_for_not_found,
                 self.lb_mem_float_ip_client.delete_floatingip,
diff --git a/octavia_tempest_plugin/tests/test_base.py b/octavia_tempest_plugin/tests/test_base.py
index a04f1cb..7f4ae3e 100644
--- a/octavia_tempest_plugin/tests/test_base.py
+++ b/octavia_tempest_plugin/tests/test_base.py
@@ -364,31 +364,31 @@
         else:
             cls._create_networks()
 
-        LOG.debug('Octavia Setup: lb_member_vip_net = {}'.format(
-            cls.lb_member_vip_net[const.ID]))
+        LOG.debug('Octavia Setup: lb_member_vip_net = %s',
+                  cls.lb_member_vip_net[const.ID])
         if cls.lb_member_vip_subnet:
-            LOG.debug('Octavia Setup: lb_member_vip_subnet = {}'.format(
-                cls.lb_member_vip_subnet[const.ID]))
-        LOG.debug('Octavia Setup: lb_member_1_net = {}'.format(
-            cls.lb_member_1_net[const.ID]))
+            LOG.debug('Octavia Setup: lb_member_vip_subnet = %s',
+                      cls.lb_member_vip_subnet[const.ID])
+        LOG.debug('Octavia Setup: lb_member_1_net = %s',
+                  cls.lb_member_1_net[const.ID])
         if cls.lb_member_1_subnet:
-            LOG.debug('Octavia Setup: lb_member_1_subnet = {}'.format(
-                cls.lb_member_1_subnet[const.ID]))
-        LOG.debug('Octavia Setup: lb_member_2_net = {}'.format(
-            cls.lb_member_2_net[const.ID]))
+            LOG.debug('Octavia Setup: lb_member_1_subnet = %s',
+                      cls.lb_member_1_subnet[const.ID])
+        LOG.debug('Octavia Setup: lb_member_2_net = %s',
+                  cls.lb_member_2_net[const.ID])
         if cls.lb_member_2_subnet:
-            LOG.debug('Octavia Setup: lb_member_2_subnet = {}'.format(
-                cls.lb_member_2_subnet[const.ID]))
+            LOG.debug('Octavia Setup: lb_member_2_subnet = %s',
+                      cls.lb_member_2_subnet[const.ID])
         if CONF.load_balancer.test_with_ipv6:
             if cls.lb_member_vip_ipv6_subnet:
-                LOG.debug('Octavia Setup: lb_member_vip_ipv6_subnet = '
-                          '{}'.format(cls.lb_member_vip_ipv6_subnet[const.ID]))
+                LOG.debug('Octavia Setup: lb_member_vip_ipv6_subnet = %s',
+                          cls.lb_member_vip_ipv6_subnet[const.ID])
             if cls.lb_member_1_ipv6_subnet:
-                LOG.debug('Octavia Setup: lb_member_1_ipv6_subnet = {}'.format(
-                    cls.lb_member_1_ipv6_subnet[const.ID]))
+                LOG.debug('Octavia Setup: lb_member_1_ipv6_subnet = %s',
+                          cls.lb_member_1_ipv6_subnet[const.ID])
             if cls.lb_member_2_ipv6_subnet:
-                LOG.debug('Octavia Setup: lb_member_2_ipv6_subnet = {}'.format(
-                    cls.lb_member_2_ipv6_subnet[const.ID]))
+                LOG.debug('Octavia Setup: lb_member_2_ipv6_subnet = %s',
+                          cls.lb_member_2_ipv6_subnet[const.ID])
 
     @classmethod
     # Neutron can be slow to clean up ports from the subnets/networks.
@@ -403,8 +403,7 @@
         try:
             cls.lb_mem_net_client.delete_network(net_id)
         except Exception:
-            LOG.error('Unable to delete network {}. Active ports:'.format(
-                net_id))
+            LOG.error('Unable to delete network %s. Active ports:', net_id)
             LOG.error(cls.lb_mem_ports_client.list_ports())
             raise
 
@@ -421,8 +420,7 @@
         try:
             cls.lb_mem_subnet_client.delete_subnet(subnet_id)
         except Exception:
-            LOG.error('Unable to delete subnet {}. Active ports:'.format(
-                subnet_id))
+            LOG.error('Unable to delete subnet %s. Active ports:', subnet_id)
             LOG.error(cls.lb_mem_ports_client.list_ports())
             raise
 
@@ -450,7 +448,7 @@
             network_kwargs['port_security_enabled'] = True
         result = cls.lb_mem_net_client.create_network(**network_kwargs)
         cls.lb_member_vip_net = result['network']
-        LOG.info('lb_member_vip_net: {}'.format(cls.lb_member_vip_net))
+        LOG.info('lb_member_vip_net: %s', cls.lb_member_vip_net)
         cls.addClassResourceCleanup(
             waiters.wait_for_not_found,
             cls._logging_delete_network,
@@ -465,7 +463,7 @@
             'ip_version': 4}
         result = cls.lb_mem_subnet_client.create_subnet(**subnet_kwargs)
         cls.lb_member_vip_subnet = result['subnet']
-        LOG.info('lb_member_vip_subnet: {}'.format(cls.lb_member_vip_subnet))
+        LOG.info('lb_member_vip_subnet: %s', cls.lb_member_vip_subnet)
         cls.addClassResourceCleanup(
             waiters.wait_for_not_found,
             cls._logging_delete_subnet,
@@ -507,8 +505,8 @@
                 cls.lb_mem_subnet_client.show_subnet,
                 cls.lb_member_vip_ipv6_subnet['id'])
 
-            LOG.info('lb_member_vip_ipv6_subnet: {}'.format(
-                cls.lb_member_vip_ipv6_subnet))
+            LOG.info('lb_member_vip_ipv6_subnet: %s',
+                     cls.lb_member_vip_ipv6_subnet)
 
         # Create tenant member 1 network
         network_kwargs = {
@@ -520,7 +518,7 @@
                 network_kwargs['port_security_enabled'] = False
         result = cls.lb_mem_net_client.create_network(**network_kwargs)
         cls.lb_member_1_net = result['network']
-        LOG.info('lb_member_1_net: {}'.format(cls.lb_member_1_net))
+        LOG.info('lb_member_1_net: %s', cls.lb_member_1_net)
         cls.addClassResourceCleanup(
             waiters.wait_for_not_found,
             cls._logging_delete_network,
@@ -535,7 +533,7 @@
             'ip_version': 4}
         result = cls.lb_mem_subnet_client.create_subnet(**subnet_kwargs)
         cls.lb_member_1_subnet = result['subnet']
-        LOG.info('lb_member_1_subnet: {}'.format(cls.lb_member_1_subnet))
+        LOG.info('lb_member_1_subnet: %s', cls.lb_member_1_subnet)
         cls.addClassResourceCleanup(
             waiters.wait_for_not_found,
             cls._logging_delete_subnet,
@@ -553,10 +551,10 @@
             cls.lb_member_1_subnet_prefix = (
                 CONF.load_balancer.member_1_ipv6_subnet_cidr.rpartition('/')[2]
                 )
-            assert(cls.lb_member_1_subnet_prefix.isdigit())
+            assert (cls.lb_member_1_subnet_prefix.isdigit())
             cls.lb_member_1_ipv6_subnet = result['subnet']
-            LOG.info('lb_member_1_ipv6_subnet: {}'.format(
-                cls.lb_member_1_ipv6_subnet))
+            LOG.info('lb_member_1_ipv6_subnet: %s',
+                     cls.lb_member_1_ipv6_subnet)
             cls.addClassResourceCleanup(
                 waiters.wait_for_not_found,
                 cls._logging_delete_subnet,
@@ -573,7 +571,7 @@
                 network_kwargs['port_security_enabled'] = False
         result = cls.lb_mem_net_client.create_network(**network_kwargs)
         cls.lb_member_2_net = result['network']
-        LOG.info('lb_member_2_net: {}'.format(cls.lb_member_2_net))
+        LOG.info('lb_member_2_net: %s', cls.lb_member_2_net)
         cls.addClassResourceCleanup(
             waiters.wait_for_not_found,
             cls._logging_delete_network,
@@ -588,7 +586,7 @@
             'ip_version': 4}
         result = cls.lb_mem_subnet_client.create_subnet(**subnet_kwargs)
         cls.lb_member_2_subnet = result['subnet']
-        LOG.info('lb_member_2_subnet: {}'.format(cls.lb_member_2_subnet))
+        LOG.info('lb_member_2_subnet: %s', cls.lb_member_2_subnet)
         cls.addClassResourceCleanup(
             waiters.wait_for_not_found,
             cls._logging_delete_subnet,
@@ -606,10 +604,10 @@
             cls.lb_member_2_subnet_prefix = (
                 CONF.load_balancer.member_2_ipv6_subnet_cidr.rpartition('/')[2]
                 )
-            assert(cls.lb_member_2_subnet_prefix.isdigit())
+            assert (cls.lb_member_2_subnet_prefix.isdigit())
             cls.lb_member_2_ipv6_subnet = result['subnet']
-            LOG.info('lb_member_2_ipv6_subnet: {}'.format(
-                cls.lb_member_2_ipv6_subnet))
+            LOG.info('lb_member_2_ipv6_subnet: %s',
+                     cls.lb_member_2_ipv6_subnet)
             cls.addClassResourceCleanup(
                 waiters.wait_for_not_found,
                 cls._logging_delete_subnet,
@@ -696,7 +694,7 @@
         result = cls.lb_mem_keypairs_client.create_keypair(
             name=keypair_name)
         cls.lb_member_keypair = result['keypair']
-        LOG.info('lb_member_keypair: {}'.format(cls.lb_member_keypair))
+        LOG.info('lb_member_keypair: %s', cls.lb_member_keypair)
         cls.addClassResourceCleanup(
             waiters.wait_for_not_found,
             cls.lb_mem_keypairs_client.delete_keypair,
@@ -866,7 +864,7 @@
                     cls.lb_mem_SGr_client.show_security_group_rule,
                     SGr['id'])
 
-            LOG.info('lb_member_sec_group: {}'.format(cls.lb_member_sec_group))
+            LOG.info('lb_member_sec_group: %s', cls.lb_member_sec_group)
 
         # Setup backend member reencryption PKI
         cls._create_backend_reencryption_pki()
@@ -880,14 +878,12 @@
         cls.webserver1_ipv6 = server_details.get('ipv6_address')
         cls.webserver1_public_ip = server_details['public_ipv4_address']
 
-        LOG.debug('Octavia Setup: lb_member_webserver1 = {}'.format(
-            cls.lb_member_webserver1[const.ID]))
-        LOG.debug('Octavia Setup: webserver1_ip = {}'.format(
-            cls.webserver1_ip))
-        LOG.debug('Octavia Setup: webserver1_ipv6 = {}'.format(
-            cls.webserver1_ipv6))
-        LOG.debug('Octavia Setup: webserver1_public_ip = {}'.format(
-            cls.webserver1_public_ip))
+        LOG.debug('Octavia Setup: lb_member_webserver1 = %s',
+                  cls.lb_member_webserver1[const.ID])
+        LOG.debug('Octavia Setup: webserver1_ip = %s', cls.webserver1_ip)
+        LOG.debug('Octavia Setup: webserver1_ipv6 = %s', cls.webserver1_ipv6)
+        LOG.debug('Octavia Setup: webserver1_public_ip = %s',
+                  cls.webserver1_public_ip)
 
         # Create webserver 2 instance
         server_details = cls._create_webserver('lb_member_webserver2',
@@ -898,14 +894,12 @@
         cls.webserver2_ipv6 = server_details.get('ipv6_address')
         cls.webserver2_public_ip = server_details['public_ipv4_address']
 
-        LOG.debug('Octavia Setup: lb_member_webserver2 = {}'.format(
-            cls.lb_member_webserver2[const.ID]))
-        LOG.debug('Octavia Setup: webserver2_ip = {}'.format(
-            cls.webserver2_ip))
-        LOG.debug('Octavia Setup: webserver2_ipv6 = {}'.format(
-            cls.webserver2_ipv6))
-        LOG.debug('Octavia Setup: webserver2_public_ip = {}'.format(
-            cls.webserver2_public_ip))
+        LOG.debug('Octavia Setup: lb_member_webserver2 = %s',
+                  cls.lb_member_webserver2[const.ID])
+        LOG.debug('Octavia Setup: webserver2_ip = %s', cls.webserver2_ip)
+        LOG.debug('Octavia Setup: webserver2_ipv6 = %s', cls.webserver2_ipv6)
+        LOG.debug('Octavia Setup: webserver2_public_ip = %s',
+                  cls.webserver2_public_ip)
 
         if CONF.load_balancer.test_with_ipv6:
             # Enable the IPv6 nic in webserver 1
@@ -954,7 +948,7 @@
             external_gateway_info=dict(
                 network_id=CONF.network.public_network_id))
         cls.lb_member_router = result['router']
-        LOG.info('lb_member_router: {}'.format(cls.lb_member_router))
+        LOG.info('lb_member_router: %s', cls.lb_member_router)
         cls.addClassResourceCleanup(
             waiters.wait_for_not_found,
             cls.lb_mem_routers_client.delete_router,
@@ -1069,7 +1063,7 @@
             CONF.load_balancer.build_timeout,
             root_tag='server')
         webserver_details = {'server': server}
-        LOG.info('Created server: {}'.format(server))
+        LOG.info('Created server: %s', server)
 
         addresses = server['addresses']
         if CONF.load_balancer.disable_boot_network:
@@ -1091,7 +1085,7 @@
                 floating_network_id=CONF.network.public_network_id,
                 port_id=port_id)
             floating_ip = result['floatingip']
-            LOG.info('webserver1_floating_ip: {}'.format(floating_ip))
+            LOG.info('webserver1_floating_ip: %s', floating_ip)
             cls.addClassResourceCleanup(
                 waiters.wait_for_not_found,
                 cls.lb_mem_float_ip_client.delete_floatingip,
@@ -1126,7 +1120,7 @@
         # the new default (SFTP protocol) doesn't work with
         # cirros VMs.
         ssh_version = cls._get_openssh_version()
-        LOG.debug("ssh_version = {}".format(ssh_version))
+        LOG.debug("ssh_version = %s", ssh_version)
         return (ssh_version[0] > 8 or
                 (ssh_version[0] == 8 and ssh_version[1] >= 7))
 
diff --git a/octavia_tempest_plugin/tests/validators.py b/octavia_tempest_plugin/tests/validators.py
index 34e8148..5ff7bd5 100644
--- a/octavia_tempest_plugin/tests/validators.py
+++ b/octavia_tempest_plugin/tests/validators.py
@@ -105,7 +105,7 @@
                 return response_text
             except requests.exceptions.Timeout:
                 # Don't sleep as we have already waited the interval.
-                LOG.info('Request for {} timed out. Retrying.'.format(URL))
+                LOG.info('Request for %s timed out. Retrying.', URL)
             except (exceptions.InvalidHttpSuccessCode,
                     exceptions.InvalidHTTPResponseBody,
                     requests.exceptions.SSLError):
@@ -113,8 +113,8 @@
                     session.close()
                 raise
             except Exception as e:
-                LOG.info('Validate URL got exception: {0}. '
-                         'Retrying.'.format(e))
+                LOG.info('Validate URL got exception: %s. '
+                         'Retrying.', e)
                 time.sleep(request_interval)
         if requests_session is None:
             session.close()
@@ -443,8 +443,8 @@
         retry_number = 0
         received_data = None
         while retry_number < number_of_retries:
-            LOG.info('make_udp_requests_with_retries attempt '
-                     'number:{}'.format(retry_number))
+            LOG.info('make_udp_requests_with_retries attempt number: %s',
+                     retry_number)
             retry_number += 1
             try:
                 received_data = self.make_udp_request(
@@ -452,6 +452,5 @@
                     source_port=src_port)
                 break
             except Exception as e:
-                LOG.warning('make_udp_request has failed with: '
-                            '{}'.format(e))
+                LOG.warning('make_udp_request has failed with: %s', e)
         return received_data
diff --git a/octavia_tempest_plugin/tests/waiters.py b/octavia_tempest_plugin/tests/waiters.py
index fa6c112..820831a 100644
--- a/octavia_tempest_plugin/tests/waiters.py
+++ b/octavia_tempest_plugin/tests/waiters.py
@@ -48,8 +48,8 @@
     :returns: The object details from the show client.
     """
     start = int(time.time())
-    LOG.info('Waiting for {name} status to update to {status}'.format(
-        name=show_client.__name__, status=status))
+    LOG.info('Waiting for %s status to update to %s',
+             show_client.__name__, status)
     while True:
         if status == const.DELETED:
             try:
@@ -65,8 +65,8 @@
             object_details = response
 
         if object_details[status_key] == status:
-            LOG.info('{name}\'s status updated to {status}.'.format(
-                name=show_client.__name__, status=status))
+            LOG.info('%s\'s status updated to %s.',
+                     show_client.__name__, status)
             return object_details
         elif object_details[status_key] == 'ERROR' and not error_ok:
             message = ('{name} {field} updated to an invalid state of '
@@ -148,8 +148,8 @@
     :returns: None
     """
     start = int(time.time())
-    LOG.info('Waiting for {name} status to update to DELETED or be not '
-             'found(404)'.format(name=show_client.__name__))
+    LOG.info('Waiting for %s status to update to DELETED or be not found(404)',
+             show_client.__name__)
     while True:
         try:
             response = show_client(id, **kwargs)
@@ -162,8 +162,8 @@
             object_details = response
 
         if object_details[status_key] == const.DELETED:
-            LOG.info('{name}\'s status updated to DELETED.'.format(
-                name=show_client.__name__))
+            LOG.info('%s\'s status updated to DELETED.',
+                     show_client.__name__)
             return
         elif int(time.time()) - start >= check_timeout:
             message = (
diff --git a/test-requirements.txt b/test-requirements.txt
index 2125ea0..bb4fcfe 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -2,7 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-hacking>=3.0.1,<3.1.0;python_version>='3.5' # Apache-2.0
+hacking>=6.1.0,<6.2.0 # Apache-2.0
 
 coverage!=4.4,>=4.0 # Apache-2.0
 python-subunit>=1.0.0 # Apache-2.0/BSD
diff --git a/tox.ini b/tox.ini
index 29df1ca..d8c77d6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -98,7 +98,6 @@
   O346 = checks:check_line_continuation_no_backslash
   O347 = checks:revert_must_have_kwargs
   O348 = checks:check_no_logging_imports
-  O349 = checks:check_no_import_mock
 paths =
   ./octavia_tempest_plugin/hacking