diff --git a/tempest/api/compute/admin/test_availability_zone.py b/tempest/api/compute/admin/test_availability_zone.py
index 5befa53..ee003b0 100644
--- a/tempest/api/compute/admin/test_availability_zone.py
+++ b/tempest/api/compute/admin/test_availability_zone.py
@@ -35,4 +35,4 @@
     def test_get_availability_zone_list_detail(self):
         # List of availability zones and available services
         availability_zone = self.client.list_availability_zones(detail=True)
-        self.assertTrue(len(availability_zone['availabilityZoneInfo']) > 0)
+        self.assertGreater(len(availability_zone['availabilityZoneInfo']), 0)
diff --git a/tempest/api/compute/admin/test_hosts.py b/tempest/api/compute/admin/test_hosts.py
index a9e9644..29e1eb8 100644
--- a/tempest/api/compute/admin/test_hosts.py
+++ b/tempest/api/compute/admin/test_hosts.py
@@ -36,7 +36,7 @@
         hosts = self.client.list_hosts()['hosts']
         host = hosts[0]
         hosts = self.client.list_hosts(zone=host['zone'])['hosts']
-        self.assertTrue(len(hosts) >= 1)
+        self.assertGreaterEqual(len(hosts), 1)
         self.assertIn(host, hosts)
 
     @test.idempotent_id('9af3c171-fbf4-4150-a624-22109733c2a6')
@@ -58,12 +58,12 @@
         hosts = self.client.list_hosts()['hosts']
 
         hosts = [host for host in hosts if host['service'] == 'compute']
-        self.assertTrue(len(hosts) >= 1)
+        self.assertGreaterEqual(len(hosts), 1)
 
         for host in hosts:
             hostname = host['host_name']
             resources = self.client.show_host(hostname)['host']
-            self.assertTrue(len(resources) >= 1)
+            self.assertGreaterEqual(len(resources), 1)
             host_resource = resources[0]['resource']
             self.assertIsNotNone(host_resource)
             self.assertIsNotNone(host_resource['cpu'])
diff --git a/tempest/api/compute/admin/test_hosts_negative.py b/tempest/api/compute/admin/test_hosts_negative.py
index 8366945..c270829 100644
--- a/tempest/api/compute/admin/test_hosts_negative.py
+++ b/tempest/api/compute/admin/test_hosts_negative.py
@@ -29,7 +29,7 @@
 
     def _get_host_name(self):
         hosts = self.client.list_hosts()['hosts']
-        self.assertTrue(len(hosts) >= 1)
+        self.assertGreaterEqual(len(hosts), 1)
         hostname = hosts[0]['host_name']
         return hostname
 
diff --git a/tempest/api/compute/admin/test_hypervisor.py b/tempest/api/compute/admin/test_hypervisor.py
index 113ec40..92a9135 100644
--- a/tempest/api/compute/admin/test_hypervisor.py
+++ b/tempest/api/compute/admin/test_hypervisor.py
@@ -52,7 +52,7 @@
         self.assertHypervisors(hypers)
 
         details = self.client.show_hypervisor(hypers[0]['id'])['hypervisor']
-        self.assertTrue(len(details) > 0)
+        self.assertGreater(len(details), 0)
         self.assertEqual(details['hypervisor_hostname'],
                          hypers[0]['hypervisor_hostname'])
 
@@ -65,14 +65,14 @@
         hostname = hypers[0]['hypervisor_hostname']
         hypervisors = (self.client.list_servers_on_hypervisor(hostname)
                        ['hypervisors'])
-        self.assertTrue(len(hypervisors) > 0)
+        self.assertGreater(len(hypervisors), 0)
 
     @test.idempotent_id('797e4f28-b6e0-454d-a548-80cc77c00816')
     def test_get_hypervisor_stats(self):
         # Verify the stats of the all hypervisor
         stats = (self.client.show_hypervisor_statistics()
                  ['hypervisor_statistics'])
-        self.assertTrue(len(stats) > 0)
+        self.assertGreater(len(stats), 0)
 
     @test.idempotent_id('91a50d7d-1c2b-4f24-b55a-a1fe20efca70')
     def test_get_hypervisor_uptime(self):
diff --git a/tempest/api/compute/admin/test_hypervisor_negative.py b/tempest/api/compute/admin/test_hypervisor_negative.py
index 9c6df7f..220ea39 100644
--- a/tempest/api/compute/admin/test_hypervisor_negative.py
+++ b/tempest/api/compute/admin/test_hypervisor_negative.py
@@ -47,7 +47,7 @@
     @test.idempotent_id('51e663d0-6b89-4817-a465-20aca0667d03')
     def test_show_hypervisor_with_non_admin_user(self):
         hypers = self._list_hypervisors()
-        self.assertTrue(len(hypers) > 0)
+        self.assertGreater(len(hypers), 0)
 
         self.assertRaises(
             lib_exc.Forbidden,
@@ -58,7 +58,7 @@
     @test.idempotent_id('2a0a3938-832e-4859-95bf-1c57c236b924')
     def test_show_servers_with_non_admin_user(self):
         hypers = self._list_hypervisors()
-        self.assertTrue(len(hypers) > 0)
+        self.assertGreater(len(hypers), 0)
 
         self.assertRaises(
             lib_exc.Forbidden,
@@ -96,7 +96,7 @@
     @test.idempotent_id('6c3461f9-c04c-4e2a-bebb-71dc9cb47df2')
     def test_get_hypervisor_uptime_with_non_admin_user(self):
         hypers = self._list_hypervisors()
-        self.assertTrue(len(hypers) > 0)
+        self.assertGreater(len(hypers), 0)
 
         self.assertRaises(
             lib_exc.Forbidden,
@@ -133,7 +133,7 @@
     @test.idempotent_id('5b6a6c79-5dc1-4fa5-9c58-9c8085948e74')
     def test_search_hypervisor_with_non_admin_user(self):
         hypers = self._list_hypervisors()
-        self.assertTrue(len(hypers) > 0)
+        self.assertGreater(len(hypers), 0)
 
         self.assertRaises(
             lib_exc.Forbidden,
diff --git a/tempest/api/compute/servers/test_attach_interfaces.py b/tempest/api/compute/servers/test_attach_interfaces.py
index b936b23..a8c59ca 100644
--- a/tempest/api/compute/servers/test_attach_interfaces.py
+++ b/tempest/api/compute/servers/test_attach_interfaces.py
@@ -215,7 +215,7 @@
     def test_create_list_show_delete_interfaces(self):
         server, ifs = self._create_server_get_interfaces()
         interface_count = len(ifs)
-        self.assertTrue(interface_count > 0)
+        self.assertGreater(interface_count, 0)
         self._check_interface(ifs[0])
 
         try:
@@ -253,7 +253,7 @@
         # Add and Remove the fixed IP to server.
         server, ifs = self._create_server_get_interfaces()
         interface_count = len(ifs)
-        self.assertTrue(interface_count > 0)
+        self.assertGreater(interface_count, 0)
         self._check_interface(ifs[0])
         network_id = ifs[0]['net_id']
         self.servers_client.add_fixed_ip(server['id'], networkId=network_id)
diff --git a/tempest/api/compute/servers/test_create_server.py b/tempest/api/compute/servers/test_create_server.py
index e985aeb..d4c2648 100644
--- a/tempest/api/compute/servers/test_create_server.py
+++ b/tempest/api/compute/servers/test_create_server.py
@@ -147,14 +147,7 @@
         'ServerGroupAffinityFilter is not available.')
     def test_create_server_with_scheduler_hint_group(self):
         # Create a server with the scheduler hint "group".
-        name = data_utils.rand_name('server_group')
-        policies = ['affinity']
-        body = self.server_groups_client.create_server_group(
-            name=name, policies=policies)['server_group']
-        group_id = body['id']
-        self.addCleanup(self.server_groups_client.delete_server_group,
-                        group_id)
-
+        group_id = self.create_test_server_group()['id']
         hints = {'group': group_id}
         server = self.create_test_server(scheduler_hints=hints,
                                          wait_until='ACTIVE')
diff --git a/tempest/api/compute/servers/test_server_addresses.py b/tempest/api/compute/servers/test_server_addresses.py
index 864f38f..d31b6f8 100644
--- a/tempest/api/compute/servers/test_server_addresses.py
+++ b/tempest/api/compute/servers/test_server_addresses.py
@@ -49,9 +49,9 @@
 
         # We do not know the exact network configuration, but an instance
         # should at least have a single public or private address
-        self.assertTrue(len(addresses) >= 1)
+        self.assertGreaterEqual(len(addresses), 1)
         for network_name, network_addresses in six.iteritems(addresses):
-            self.assertTrue(len(network_addresses) >= 1)
+            self.assertGreaterEqual(len(network_addresses), 1)
             for address in network_addresses:
                 self.assertTrue(address['addr'])
                 self.assertTrue(address['version'])
diff --git a/tempest/api/image/v1/test_images.py b/tempest/api/image/v1/test_images.py
index 269e297..7d52695 100644
--- a/tempest/api/image/v1/test_images.py
+++ b/tempest/api/image/v1/test_images.py
@@ -247,7 +247,7 @@
     def test_index_min_size(self):
         images_list = self.client.list_images(size_min=142)['images']
         for image in images_list:
-            self.assertTrue(image['size'] >= 142)
+            self.assertGreaterEqual(image['size'], 142)
         result_set = set(map(lambda x: x['id'], images_list))
         self.assertTrue(self.size142_set <= result_set)
         self.assertFalse(self.size42_set <= result_set)
diff --git a/tempest/api/volume/test_availability_zone.py b/tempest/api/volume/test_availability_zone.py
index fe51375..ae4b8f9 100644
--- a/tempest/api/volume/test_availability_zone.py
+++ b/tempest/api/volume/test_availability_zone.py
@@ -30,7 +30,7 @@
         # List of availability zone
         availability_zone = (self.client.list_availability_zones()
                              ['availabilityZoneInfo'])
-        self.assertTrue(len(availability_zone) > 0)
+        self.assertGreater(len(availability_zone), 0)
 
 
 class AvailabilityZoneV1TestJSON(AvailabilityZoneV2TestJSON):