diff --git a/cvp_checks/tests/ceph/test_ceph_haproxy.py b/cvp_checks/tests/ceph/test_ceph_haproxy.py
index 7bff15b..d6c8e49 100644
--- a/cvp_checks/tests/ceph/test_ceph_haproxy.py
+++ b/cvp_checks/tests/ceph/test_ceph_haproxy.py
@@ -8,9 +8,9 @@
     monitor_info = local_salt_client.cmd(
         'ceph:mon',
         'cmd.run',
-       ["echo 'show stat' | nc -U "
-        "/var/run/haproxy/admin.sock | "
-        "grep ceph_mon_radosgw_cluster"],
+        ["echo 'show stat' | nc -U "
+         "/var/run/haproxy/admin.sock | "
+         "grep ceph_mon_radosgw_cluster"],
         expr_form='pillar')
     if not monitor_info:
         pytest.skip("Ceph is not found on this environment")
diff --git a/cvp_checks/tests/test_contrail.py b/cvp_checks/tests/test_contrail.py
index a469976..b8955f0 100644
--- a/cvp_checks/tests/test_contrail.py
+++ b/cvp_checks/tests/test_contrail.py
@@ -1,6 +1,7 @@
 import pytest
 import json
 
+
 def test_contrail_compute_status(local_salt_client):
     probe = local_salt_client.cmd(
         'opencontrail:control', 'cmd.run',
@@ -51,7 +52,7 @@
             if 'crashes/core.java.' not in line:
                 name, status = line.split(None, 1)
             else:
-                name, status = line,'FATAL'
+                name, status = line, 'FATAL'
             if status not in {'active', 'backup'}:
                 err_msg = "{node}:{service} - {status}".format(
                     node=node, service=name, status=status)
diff --git a/cvp_checks/tests/test_galera_cluster.py b/cvp_checks/tests/test_galera_cluster.py
index 003b0d6..5a74bdd 100644
--- a/cvp_checks/tests/test_galera_cluster.py
+++ b/cvp_checks/tests/test_galera_cluster.py
@@ -1,3 +1,6 @@
+import pytest
+
+
 def test_galera_cluster_status(local_salt_client):
     gs = local_salt_client.cmd(
         'galera:*',
diff --git a/cvp_checks/tests/test_k8s.py b/cvp_checks/tests/test_k8s.py
index d7aed4b..2ff3383 100644
--- a/cvp_checks/tests/test_k8s.py
+++ b/cvp_checks/tests/test_k8s.py
@@ -1,6 +1,7 @@
 import pytest
 import json
 
+
 def test_k8s_get_cs_status(local_salt_client):
     result = local_salt_client.cmd(
         'etcd:server', 'cmd.run',
@@ -17,11 +18,11 @@
                 continue
             else:
                 if 'Healthy' not in line:
-                    errors.append (line)
+                    errors.append(line)
         break
     assert not errors, 'k8s is not healthy: {}'.format(json.dumps(
-                                                             errors,
-                                                             indent=4))
+                                                       errors,
+                                                       indent=4))
 
 
 def test_k8s_get_nodes_status(local_salt_client):
@@ -40,8 +41,8 @@
                 continue
             else:
                 if 'Ready' not in line:
-                    errors.append (line)
+                    errors.append(line)
         break
     assert not errors, 'k8s is not healthy: {}'.format(json.dumps(
-                                                             errors,
-                                                             indent=4))
+                                                       errors,
+                                                       indent=4))
diff --git a/cvp_checks/tests/test_mtu.py b/cvp_checks/tests/test_mtu.py
index be17237..8d76cef 100644
--- a/cvp_checks/tests/test_mtu.py
+++ b/cvp_checks/tests/test_mtu.py
@@ -9,10 +9,12 @@
     utils.get_groups(os.path.basename(__file__))
 )
 def test_mtu(local_salt_client, group):
+    testname = os.path.basename(__file__).split('.')[0]
     if "skipped" in group:
         pytest.skip("skipped in config")
     config = utils.get_configuration()
-    skipped_ifaces = config["skipped_ifaces"]
+    skipped_ifaces = config.get(testname)["skipped_ifaces"] or \
+        ["bonding_masters", "lo", "veth", "tap", "cali"]
     total = {}
     network_info = local_salt_client.cmd(
         group, 'cmd.run', ['ls /sys/class/net/'], expr_form='pcre')
@@ -68,4 +70,3 @@
     assert len(mtu_data) == 0, \
         "Several problems found for {0} group: {1}".format(
         group, json.dumps(mtu_data, indent=4))
-
diff --git a/cvp_checks/tests/test_ntp_sync.py b/cvp_checks/tests/test_ntp_sync.py
index b900e12..09b323f 100644
--- a/cvp_checks/tests/test_ntp_sync.py
+++ b/cvp_checks/tests/test_ntp_sync.py
@@ -17,9 +17,10 @@
         'cmd.run',
         ['date +%s'],
         expr_form='compound')
+    diff = config.get(testname)["time_deviation"] or 30
     for node, time in nodes_time.iteritems():
-        if (int(time) - saltmaster_time) > config.get(testname)["time_deviation"] or \
-                (int(time) - saltmaster_time) < -config.get(testname)["time_deviation"]:
+        if (int(time) - saltmaster_time) > diff or \
+                (int(time) - saltmaster_time) < -diff:
             fail[node] = time
 
     assert not fail, 'SaltMaster time: {}\n' \
diff --git a/cvp_checks/tests/test_rabbit_cluster.py b/cvp_checks/tests/test_rabbit_cluster.py
index 94de975..acd4a96 100644
--- a/cvp_checks/tests/test_rabbit_cluster.py
+++ b/cvp_checks/tests/test_rabbit_cluster.py
@@ -1,6 +1,3 @@
-import re
-
-
 def test_checking_rabbitmq_cluster(local_salt_client):
     # disable config for this test
     # it may be reintroduced in future
diff --git a/cvp_checks/tests/test_repo_list.py b/cvp_checks/tests/test_repo_list.py
index bd3214c..07f16d0 100644
--- a/cvp_checks/tests/test_repo_list.py
+++ b/cvp_checks/tests/test_repo_list.py
@@ -19,9 +19,10 @@
         ['cat /etc/apt/sources.list.d/*;'
          'cat /etc/apt/sources.list|grep deb|grep -v "#"'],
         expr_form='pcre')
-    actual_repo_list = [item.replace('/ ', ' ').replace('[arch=amd64] ','')
+    actual_repo_list = [item.replace('/ ', ' ').replace('[arch=amd64] ', '')
                         for item in raw_actual_info.values()[0].split('\n')]
-    expected_salt_data = [repo['source'].replace('/ ', ' ').replace('[arch=amd64] ','')
+    expected_salt_data = [repo['source'].replace('/ ', ' ')
+                                        .replace('[arch=amd64] ', '')
                           for repo in info_salt.values()[0]
                           ['linux:system:repo'].values()]
 
@@ -44,6 +45,6 @@
             diff[repo] = rows
     assert fail_counter == 0, \
         "Several problems found for {0} group: {1}".format(
-        group, json.dumps(diff, indent=4))
+            group, json.dumps(diff, indent=4))
     if fail_counter == 0 and len(diff) > 0:
         print "\nWarning: nodes contain more repos than reclass"