diff --git a/scenario/scenario_base.py b/scenario/scenario_base.py
index 84e14a9..14b8cec 100644
--- a/scenario/scenario_base.py
+++ b/scenario/scenario_base.py
@@ -14,7 +14,7 @@
 
 
 class ScenarioTestsBase(test.HeatIntegrationTest):
-    "This class define common parameters for scenario tests"
+    """This class defines common parameters for scenario tests."""
 
     def setUp(self):
         super(ScenarioTestsBase, self).setUp()
diff --git a/scenario/test_autoscaling_lb.py b/scenario/test_autoscaling_lb.py
index 21b27dd..1d4d41d 100644
--- a/scenario/test_autoscaling_lb.py
+++ b/scenario/test_autoscaling_lb.py
@@ -20,8 +20,7 @@
 
 
 class AutoscalingLoadBalancerTest(scenario_base.ScenarioTestsBase):
-    """
-    The class is responsible for testing ASG + LB scenario.
+    """The class is responsible for testing ASG + LB scenario.
 
     The very common use case tested is an autoscaling group
     of some web application servers behind a loadbalancer.
@@ -52,8 +51,7 @@
         return all_res and all_res_complete
 
     def test_autoscaling_loadbalancer_neutron(self):
-        """
-        Check work of AutoScaing and Neutron LBaaS resource in Heat.
+        """Check work of AutoScaing and Neutron LBaaS resource in Heat.
 
         The scenario is the following:
             1. Launch a stack with a load balancer and autoscaling group
diff --git a/scenario/test_server_cfn_init.py b/scenario/test_server_cfn_init.py
index 267b44b..d3ee7ee 100644
--- a/scenario/test_server_cfn_init.py
+++ b/scenario/test_server_cfn_init.py
@@ -17,9 +17,7 @@
 
 
 class CfnInitIntegrationTest(scenario_base.ScenarioTestsBase):
-    """
-    The class is responsible for testing cfn-init and cfn-signal workability
-    """
+    """Testing cfn-init and cfn-signal workability."""
 
     def setUp(self):
         super(CfnInitIntegrationTest, self).setUp()
@@ -94,8 +92,7 @@
                 raise e
 
     def test_server_cfn_init(self):
-        """
-        Check cfn-init and cfn-signal availability on the created server.
+        """Check cfn-init and cfn-signal availability on the created server.
 
         The alternative scenario is the following:
             1. Create a stack with a server and configured security group.
diff --git a/scenario/test_server_software_config.py b/scenario/test_server_software_config.py
index 8739a99..ad76763 100644
--- a/scenario/test_server_software_config.py
+++ b/scenario/test_server_software_config.py
@@ -133,8 +133,7 @@
                 dep1_dep.creation_time)
 
     def test_server_software_config(self):
-        """
-        Check that passed files with scripts are executed on created server.
+        """Check that passed files with scripts are executed on created server.
 
         The alternative scenario is the following:
             1. Create a stack and pass files with scripts.
diff --git a/scenario/test_volumes.py b/scenario/test_volumes.py
index d4b1aa8..7980d81 100644
--- a/scenario/test_volumes.py
+++ b/scenario/test_volumes.py
@@ -22,9 +22,7 @@
 
 
 class VolumeBackupRestoreIntegrationTest(scenario_base.ScenarioTestsBase):
-    """
-    Class is responsible for testing of volume backup.
-    """
+    """Class is responsible for testing of volume backup."""
 
     def setUp(self):
         super(VolumeBackupRestoreIntegrationTest, self).setUp()
@@ -101,8 +99,7 @@
                           volume_id2)
 
     def test_cinder_volume_create_backup_restore(self):
-        """
-        Ensure the 'Snapshot' deletion policy works.
+        """Ensure the 'Snapshot' deletion policy works.
 
         This requires a more complex test, but it tests several aspects
         of the heat cinder resources: