diff --git a/tempest/scenario/test_shelve_instance.py b/tempest/scenario/test_shelve_instance.py
index 378ae9d..d35e193 100644
--- a/tempest/scenario/test_shelve_instance.py
+++ b/tempest/scenario/test_shelve_instance.py
@@ -13,7 +13,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from oslo_log import log
 import testtools
 
 from tempest.common import waiters
@@ -23,8 +22,6 @@
 
 CONF = config.CONF
 
-LOG = log.getLogger(__name__)
-
 
 class TestShelveInstance(manager.ScenarioTest):
     """This test shelves then unshelves a Nova instance
diff --git a/tempest/scenario/test_snapshot_pattern.py b/tempest/scenario/test_snapshot_pattern.py
index f3b6558..14c171c 100644
--- a/tempest/scenario/test_snapshot_pattern.py
+++ b/tempest/scenario/test_snapshot_pattern.py
@@ -13,7 +13,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from oslo_log import log
 import testtools
 
 from tempest import config
@@ -22,8 +21,6 @@
 
 CONF = config.CONF
 
-LOG = log.getLogger(__name__)
-
 
 class TestSnapshotPattern(manager.ScenarioTest):
     """This test is for snapshotting an instance and booting with it.
diff --git a/tempest/scenario/test_stamp_pattern.py b/tempest/scenario/test_stamp_pattern.py
index 8183ce3..4d01363 100644
--- a/tempest/scenario/test_stamp_pattern.py
+++ b/tempest/scenario/test_stamp_pattern.py
@@ -25,10 +25,8 @@
 from tempest import exceptions
 from tempest.scenario import manager
 from tempest import test
-import tempest.test
 
 CONF = config.CONF
-
 LOG = logging.getLogger(__name__)
 
 
@@ -110,16 +108,16 @@
             LOG.debug("Partitions:%s" % part)
             return CONF.compute.volume_device_name in part
 
-        if not tempest.test.call_until_true(_func,
-                                            CONF.compute.build_timeout,
-                                            CONF.compute.build_interval):
+        if not test.call_until_true(_func,
+                                    CONF.compute.build_timeout,
+                                    CONF.compute.build_interval):
             raise exceptions.TimeoutException
 
     @decorators.skip_because(bug="1205344")
     @test.idempotent_id('10fd234a-515c-41e5-b092-8323060598c5')
     @testtools.skipUnless(CONF.compute_feature_enabled.snapshot,
                           'Snapshotting is not available.')
-    @tempest.test.services('compute', 'network', 'volume', 'image')
+    @test.services('compute', 'network', 'volume', 'image')
     def test_stamp_pattern(self):
         # prepare for booting an instance
         keypair = self.create_keypair()
diff --git a/tempest/scenario/test_volume_boot_pattern.py b/tempest/scenario/test_volume_boot_pattern.py
index 7b88025..cc640e7 100644
--- a/tempest/scenario/test_volume_boot_pattern.py
+++ b/tempest/scenario/test_volume_boot_pattern.py
@@ -10,8 +10,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from oslo_log import log
-
 from tempest.common.utils import data_utils
 from tempest.common import waiters
 from tempest import config
@@ -20,8 +18,6 @@
 
 CONF = config.CONF
 
-LOG = log.getLogger(__name__)
-
 
 class TestVolumeBootPattern(manager.ScenarioTest):