diff --git a/tempest/api/compute/admin/test_delete_server.py b/tempest/api/compute/admin/test_delete_server.py
index 83444b9..58cac57 100644
--- a/tempest/api/compute/admin/test_delete_server.py
+++ b/tempest/api/compute/admin/test_delete_server.py
@@ -15,11 +15,8 @@
 
 from tempest.api.compute import base
 from tempest.common import waiters
-from tempest import config
 from tempest.lib import decorators
 
-CONF = config.CONF
-
 
 class DeleteServersAdminTestJSON(base.BaseV2ComputeAdminTest):
     # NOTE: Server creations of each test class should be under 10
diff --git a/tempest/api/compute/admin/test_server_diagnostics_negative.py b/tempest/api/compute/admin/test_server_diagnostics_negative.py
index d5b6674..6215c37 100644
--- a/tempest/api/compute/admin/test_server_diagnostics_negative.py
+++ b/tempest/api/compute/admin/test_server_diagnostics_negative.py
@@ -18,8 +18,6 @@
 
 
 class ServerDiagnosticsNegativeTest(base.BaseV2ComputeAdminTest):
-    min_microversion = None
-    max_microversion = '2.47'
 
     @classmethod
     def setup_clients(cls):
@@ -33,8 +31,3 @@
         server_id = self.create_test_server(wait_until='ACTIVE')['id']
         self.assertRaises(lib_exc.Forbidden,
                           self.client.show_server_diagnostics, server_id)
-
-
-class ServerDiagnosticsNegativeV248Test(ServerDiagnosticsNegativeTest):
-    min_microversion = '2.48'
-    max_microversion = 'latest'
diff --git a/tempest/api/identity/admin/v3/test_application_credentials.py b/tempest/api/identity/admin/v3/test_application_credentials.py
index 4a74ef8..7e802c6 100644
--- a/tempest/api/identity/admin/v3/test_application_credentials.py
+++ b/tempest/api/identity/admin/v3/test_application_credentials.py
@@ -15,13 +15,9 @@
 #    under the License.
 
 from tempest.api.identity import base
-from tempest import config
 from tempest.lib import decorators
 
 
-CONF = config.CONF
-
-
 class ApplicationCredentialsV3AdminTest(base.BaseApplicationCredentialsV3Test,
                                         base.BaseIdentityV3AdminTest):
 
diff --git a/tempest/api/identity/admin/v3/test_projects.py b/tempest/api/identity/admin/v3/test_projects.py
index bc94a8e..6ddf42e 100644
--- a/tempest/api/identity/admin/v3/test_projects.py
+++ b/tempest/api/identity/admin/v3/test_projects.py
@@ -14,12 +14,9 @@
 #    under the License.
 
 from tempest.api.identity import base
-from tempest import config
 from tempest.lib.common.utils import data_utils
 from tempest.lib import decorators
 
-CONF = config.CONF
-
 
 class ProjectsTestJSON(base.BaseIdentityV3AdminTest):
 
diff --git a/tempest/api/identity/admin/v3/test_roles.py b/tempest/api/identity/admin/v3/test_roles.py
index 62ced19..47f663c 100644
--- a/tempest/api/identity/admin/v3/test_roles.py
+++ b/tempest/api/identity/admin/v3/test_roles.py
@@ -14,14 +14,11 @@
 #    under the License.
 
 from tempest.api.identity import base
-from tempest import config
 from tempest.lib.common.utils import data_utils
 from tempest.lib.common.utils import test_utils
 from tempest.lib import decorators
 from tempest.lib import exceptions as lib_exc
 
-CONF = config.CONF
-
 
 class RolesV3TestJSON(base.BaseIdentityV3AdminTest):
 
diff --git a/tempest/api/identity/v3/test_application_credentials.py b/tempest/api/identity/v3/test_application_credentials.py
index caf0b1e..1cee902 100644
--- a/tempest/api/identity/v3/test_application_credentials.py
+++ b/tempest/api/identity/v3/test_application_credentials.py
@@ -19,13 +19,9 @@
 from oslo_utils import timeutils
 
 from tempest.api.identity import base
-from tempest import config
 from tempest.lib import decorators
 
 
-CONF = config.CONF
-
-
 class ApplicationCredentialsV3Test(base.BaseApplicationCredentialsV3Test):
 
     def _list_app_creds(self, name=None):
diff --git a/tempest/api/network/admin/test_l3_agent_scheduler.py b/tempest/api/network/admin/test_l3_agent_scheduler.py
index 206d867..033bf55 100644
--- a/tempest/api/network/admin/test_l3_agent_scheduler.py
+++ b/tempest/api/network/admin/test_l3_agent_scheduler.py
@@ -14,11 +14,9 @@
 
 from tempest.api.network import base
 from tempest.common import utils
-from tempest import config
 from tempest.lib import decorators
 from tempest.lib import exceptions
 
-CONF = config.CONF
 AGENT_TYPE = 'L3 agent'
 AGENT_MODES = (
     'legacy',
diff --git a/tempest/api/network/admin/test_ports.py b/tempest/api/network/admin/test_ports.py
index 483b405..05363db 100644
--- a/tempest/api/network/admin/test_ports.py
+++ b/tempest/api/network/admin/test_ports.py
@@ -14,11 +14,8 @@
 #    under the License.
 
 from tempest.api.network import base
-from tempest import config
 from tempest.lib import decorators
 
-CONF = config.CONF
-
 
 class PortsAdminExtendedAttrsTestJSON(base.BaseAdminNetworkTest):
 
diff --git a/tempest/api/network/test_allowed_address_pair.py b/tempest/api/network/test_allowed_address_pair.py
index 3075047..dec3413 100644
--- a/tempest/api/network/test_allowed_address_pair.py
+++ b/tempest/api/network/test_allowed_address_pair.py
@@ -17,11 +17,8 @@
 
 from tempest.api.network import base
 from tempest.common import utils
-from tempest import config
 from tempest.lib import decorators
 
-CONF = config.CONF
-
 
 class AllowedAddressPairTestJSON(base.BaseNetworkTest):
     """Tests the Neutron Allowed Address Pair API extension
diff --git a/tempest/api/network/test_ports.py b/tempest/api/network/test_ports.py
index 246a5c3..2c9159c 100644
--- a/tempest/api/network/test_ports.py
+++ b/tempest/api/network/test_ports.py
@@ -22,13 +22,10 @@
 from tempest.api.network import base_security_groups as sec_base
 from tempest.common import custom_matchers
 from tempest.common import utils
-from tempest import config
 from tempest.lib.common.utils import data_utils
 from tempest.lib import decorators
 from tempest.lib import exceptions
 
-CONF = config.CONF
-
 
 class PortsTestJSON(sec_base.BaseSecGroupTest):
     """Test the following operations for ports:
diff --git a/tempest/api/network/test_routers_negative.py b/tempest/api/network/test_routers_negative.py
index ddd7d3a..0b61860 100644
--- a/tempest/api/network/test_routers_negative.py
+++ b/tempest/api/network/test_routers_negative.py
@@ -15,13 +15,10 @@
 
 from tempest.api.network import base
 from tempest.common import utils
-from tempest import config
 from tempest.lib.common.utils import data_utils
 from tempest.lib import decorators
 from tempest.lib import exceptions as lib_exc
 
-CONF = config.CONF
-
 
 class RoutersNegativeTest(base.BaseNetworkTest):
 
diff --git a/tempest/api/network/test_security_groups.py b/tempest/api/network/test_security_groups.py
index 24bd8ea..ffc1fca 100644
--- a/tempest/api/network/test_security_groups.py
+++ b/tempest/api/network/test_security_groups.py
@@ -15,12 +15,9 @@
 
 from tempest.api.network import base_security_groups as base
 from tempest.common import utils
-from tempest import config
 from tempest.lib.common.utils import data_utils
 from tempest.lib import decorators
 
-CONF = config.CONF
-
 
 class SecGroupTest(base.BaseSecGroupTest):
 
diff --git a/tempest/api/volume/test_volumes_snapshots.py b/tempest/api/volume/test_volumes_snapshots.py
index 4b97b80..1855386 100644
--- a/tempest/api/volume/test_volumes_snapshots.py
+++ b/tempest/api/volume/test_volumes_snapshots.py
@@ -130,54 +130,39 @@
         # Delete the snapshot
         self.delete_snapshot(snapshot['id'])
 
+    def _create_volume_from_snapshot(self, extra_size=0):
+        src_size = CONF.volume.volume_size
+        size = src_size + extra_size
+
+        src_vol = self.create_volume(size=src_size)
+        src_snap = self.create_snapshot(src_vol['id'])
+
+        dst_vol = self.create_volume(snapshot_id=src_snap['id'],
+                                     size=size)
+        # NOTE(zhufl): dst_vol is created based on snapshot, so dst_vol
+        # should be deleted before deleting snapshot, otherwise deleting
+        # snapshot will end with status 'error-deleting'. This depends on
+        # the implementation mechanism of vendors, generally speaking,
+        # some verdors will use "virtual disk clone" which will promote
+        # disk clone speed, and in this situation the "disk clone"
+        # is just a relationship between volume and snapshot.
+        self.addCleanup(self.delete_volume, self.volumes_client, dst_vol['id'])
+
+        volume = self.volumes_client.show_volume(dst_vol['id'])['volume']
+        # Should allow
+        self.assertEqual(volume['snapshot_id'], src_snap['id'])
+        self.assertEqual(volume['size'], size)
+
     @decorators.idempotent_id('677863d1-3142-456d-b6ac-9924f667a7f4')
     def test_volume_from_snapshot(self):
         # Creates a volume from a snapshot passing a size
         # different from the source
-        src_size = CONF.volume.volume_size
-
-        src_vol = self.create_volume(size=src_size)
-        src_snap = self.create_snapshot(src_vol['id'])
-        # Destination volume bigger than source snapshot
-        dst_vol = self.create_volume(snapshot_id=src_snap['id'],
-                                     size=src_size + 1)
-        # NOTE(zhufl): dst_vol is created based on snapshot, so dst_vol
-        # should be deleted before deleting snapshot, otherwise deleting
-        # snapshot will end with status 'error-deleting'. This depends on
-        # the implementation mechanism of vendors, generally speaking,
-        # some verdors will use "virtual disk clone" which will promote
-        # disk clone speed, and in this situation the "disk clone"
-        # is just a relationship between volume and snapshot.
-        self.addCleanup(self.delete_volume, self.volumes_client, dst_vol['id'])
-
-        volume = self.volumes_client.show_volume(dst_vol['id'])['volume']
-        # Should allow
-        self.assertEqual(volume['snapshot_id'], src_snap['id'])
-        self.assertEqual(volume['size'], src_size + 1)
+        self._create_volume_from_snapshot(extra_size=1)
 
     @decorators.idempotent_id('053d8870-8282-4fff-9dbb-99cb58bb5e0a')
     def test_volume_from_snapshot_no_size(self):
         # Creates a volume from a snapshot defaulting to original size
-        src_size = CONF.volume.volume_size
-
-        src_vol = self.create_volume(size=src_size)
-        src_snap = self.create_snapshot(src_vol['id'])
-        # Destination volume without specifying a size
-        dst_vol = self.create_volume(snapshot_id=src_snap['id'])
-
-        # NOTE(zhufl): dst_vol is created based on snapshot, so dst_vol
-        # should be deleted before deleting snapshot, otherwise deleting
-        # snapshot will end with status 'error-deleting'. This depends on
-        # the implementation mechanism of vendors, generally speaking,
-        # some verdors will use "virtual disk clone" which will promote
-        # disk clone speed, and in this situation the "disk clone"
-        # is just a relationship between volume and snapshot.
-        self.addCleanup(self.delete_volume, self.volumes_client, dst_vol['id'])
-
-        volume = self.volumes_client.show_volume(dst_vol['id'])['volume']
-        # Should allow
-        self.assertEqual(volume['snapshot_id'], src_snap['id'])
-        self.assertEqual(volume['size'], src_size)
+        self._create_volume_from_snapshot()
 
     @decorators.idempotent_id('bbcfa285-af7f-479e-8c1a-8c34fc16543c')
     @testtools.skipUnless(CONF.volume_feature_enabled.backup,
diff --git a/tempest/cmd/run.py b/tempest/cmd/run.py
index a27425c..84c6d9a 100644
--- a/tempest/cmd/run.py
+++ b/tempest/cmd/run.py
@@ -160,8 +160,6 @@
             sys.exit(2)
         if parsed_args.state:
             self._init_state()
-        else:
-            pass
 
         regex = self._build_regex(parsed_args)
         return_code = 0