diff --git a/tempest/tests/common/test_debug.py b/tempest/tests/common/test_debug.py
new file mode 100644
index 0000000..cd9936c
--- /dev/null
+++ b/tempest/tests/common/test_debug.py
@@ -0,0 +1,122 @@
+# Copyright 2014 NEC Corporation.
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import mock
+
+from tempest.common import debug
+from tempest import config
+from tempest.openstack.common.fixture import mockpatch
+from tempest import test
+from tempest.tests import base
+from tempest.tests import fake_config
+
+
+class TestDebug(base.TestCase):
+
+    def setUp(self):
+        super(TestDebug, self).setUp()
+        self.useFixture(fake_config.ConfigFixture())
+        self.stubs.Set(config, 'TempestConfigPrivate', fake_config.FakePrivate)
+
+        common_pre = 'tempest.common.commands'
+        self.ip_addr_raw_mock = self.patch(common_pre + '.ip_addr_raw')
+        self.ip_route_raw_mock = self.patch(common_pre + '.ip_route_raw')
+        self.iptables_raw_mock = self.patch(common_pre + '.iptables_raw')
+        self.ip_ns_list_mock = self.patch(common_pre + '.ip_ns_list')
+        self.ip_ns_addr_mock = self.patch(common_pre + '.ip_ns_addr')
+        self.ip_ns_route_mock = self.patch(common_pre + '.ip_ns_route')
+        self.iptables_ns_mock = self.patch(common_pre + '.iptables_ns')
+        self.ovs_db_dump_mock = self.patch(common_pre + '.ovs_db_dump')
+
+        self.log_mock = self.patch('tempest.common.debug.LOG')
+
+    def test_log_ip_ns_debug_disabled(self):
+        self.useFixture(mockpatch.PatchObject(test.CONF.debug,
+                                              'enable', False))
+        debug.log_ip_ns()
+        self.assertFalse(self.ip_addr_raw_mock.called)
+        self.assertFalse(self.log_mock.info.called)
+
+    def test_log_ip_ns_debug_enabled(self):
+        self.useFixture(mockpatch.PatchObject(test.CONF.debug,
+                                              'enable', True))
+
+        tables = ['filter', 'nat', 'mangle']
+        self.ip_ns_list_mock.return_value = [1, 2]
+
+        debug.log_ip_ns()
+        self.ip_addr_raw_mock.assert_called_with()
+        self.assertTrue(self.log_mock.info.called)
+        self.ip_route_raw_mock.assert_called_with()
+        self.assertEqual(len(tables), self.iptables_raw_mock.call_count)
+        for table in tables:
+            self.assertIn(mock.call(table),
+                          self.iptables_raw_mock.call_args_list)
+
+        self.ip_ns_list_mock.assert_called_with()
+        self.assertEqual(len(self.ip_ns_list_mock.return_value),
+                         self.ip_ns_addr_mock.call_count)
+        self.assertEqual(len(self.ip_ns_list_mock.return_value),
+                         self.ip_ns_route_mock.call_count)
+        for ns in self.ip_ns_list_mock.return_value:
+            self.assertIn(mock.call(ns),
+                          self.ip_ns_addr_mock.call_args_list)
+            self.assertIn(mock.call(ns),
+                          self.ip_ns_route_mock.call_args_list)
+
+        self.assertEqual(len(tables) * len(self.ip_ns_list_mock.return_value),
+                         self.iptables_ns_mock.call_count)
+        for ns in self.ip_ns_list_mock.return_value:
+            for table in tables:
+                self.assertIn(mock.call(ns, table),
+                              self.iptables_ns_mock.call_args_list)
+
+    def test_log_ovs_db_debug_disabled(self):
+        self.useFixture(mockpatch.PatchObject(test.CONF.debug,
+                                              'enable', False))
+        self.useFixture(mockpatch.PatchObject(test.CONF.service_available,
+                                              'neutron', False))
+        debug.log_ovs_db()
+        self.assertFalse(self.ovs_db_dump_mock.called)
+
+        self.useFixture(mockpatch.PatchObject(test.CONF.debug,
+                                              'enable', True))
+        self.useFixture(mockpatch.PatchObject(test.CONF.service_available,
+                                              'neutron', False))
+        debug.log_ovs_db()
+        self.assertFalse(self.ovs_db_dump_mock.called)
+
+        self.useFixture(mockpatch.PatchObject(test.CONF.debug,
+                                              'enable', False))
+        self.useFixture(mockpatch.PatchObject(test.CONF.service_available,
+                                              'neutron', True))
+        debug.log_ovs_db()
+        self.assertFalse(self.ovs_db_dump_mock.called)
+
+    def test_log_ovs_db_debug_enabled(self):
+        self.useFixture(mockpatch.PatchObject(test.CONF.debug,
+                                              'enable', True))
+        self.useFixture(mockpatch.PatchObject(test.CONF.service_available,
+                                              'neutron', True))
+        debug.log_ovs_db()
+        self.ovs_db_dump_mock.assert_called_with()
+
+    def test_log_net_debug(self):
+        self.log_ip_ns_mock = self.patch('tempest.common.debug.log_ip_ns')
+        self.log_ovs_db_mock = self.patch('tempest.common.debug.log_ovs_db')
+
+        debug.log_net_debug()
+        self.log_ip_ns_mock.assert_called_with()
+        self.log_ovs_db_mock.assert_called_with()