diff --git a/ironic_python_agent/tests/unit/base.py b/ironic_python_agent/tests/unit/base.py
new file mode 100644
index 000000000..11fff16b7
--- /dev/null
+++ b/ironic_python_agent/tests/unit/base.py
@@ -0,0 +1,43 @@
+# Copyright 2017 Cisco Systems, Inc
+#
+# 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.
+
+"""Common utilities and classes across all unit tests."""
+
+import mock
+
+from oslotest import base as test_base
+
+from ironic_python_agent import utils
+
+
+class IronicAgentTest(test_base.BaseTestCase):
+    """Extends the base test to provide common features across agent tests."""
+
+    def setUp(self):
+        super(IronicAgentTest, self).setUp()
+        """Add a blanket ban on running external processes via utils.execute().
+
+        `self` will grow a property  called _exec_patch which is the Mock
+        that replaces utils.execute.
+
+        If the mock is called, an exception is raised to warn the tester.
+        """
+        # NOTE(bigjools): Not using a decorator on tests because I don't
+        # want to force every test method to accept a new arg. Instead, they
+        # can override or examine this self._exec_patch Mock as needed.
+        self._exec_patch = mock.Mock()
+        self._exec_patch.side_effect = Exception(
+            "Don't call utils.execute in tests!")
+        self.patch(utils, 'execute', self._exec_patch)
diff --git a/ironic_python_agent/tests/unit/test_agent.py b/ironic_python_agent/tests/unit/test_agent.py
index 45dd9ee12..f2ede91ca 100644
--- a/ironic_python_agent/tests/unit/test_agent.py
+++ b/ironic_python_agent/tests/unit/test_agent.py
@@ -20,7 +20,6 @@ import mock
 from oslo_concurrency import processutils
 from oslo_config import cfg
 from oslo_serialization import jsonutils
-from oslotest import base as test_base
 import pkg_resources
 from stevedore import extension
 
@@ -31,6 +30,7 @@ from ironic_python_agent.extensions import base
 from ironic_python_agent import hardware
 from ironic_python_agent import inspector
 from ironic_python_agent import netutils
+from ironic_python_agent.tests.unit import base as ironic_agent_base
 from ironic_python_agent import utils
 
 EXPECTED_ERROR = RuntimeError('command execution failed')
@@ -49,7 +49,7 @@ class FakeExtension(base.BaseAgentExtension):
     pass
 
 
-class TestHeartbeater(test_base.BaseTestCase):
+class TestHeartbeater(ironic_agent_base.IronicAgentTest):
     def setUp(self):
         super(TestHeartbeater, self).setUp()
         self.mock_agent = mock.Mock()
@@ -129,7 +129,7 @@ class TestHeartbeater(test_base.BaseTestCase):
 
 @mock.patch.object(hardware.GenericHardwareManager, '_wait_for_disks',
                    lambda self: None)
-class TestBaseAgent(test_base.BaseTestCase):
+class TestBaseAgent(ironic_agent_base.IronicAgentTest):
 
     def setUp(self):
         super(TestBaseAgent, self).setUp()
@@ -171,6 +171,10 @@ class TestBaseAgent(test_base.BaseTestCase):
         self.assertEqual(pkg_resources.get_distribution('ironic-python-agent')
                          .version, status.version)
 
+    @mock.patch.object(hardware, '_check_for_iscsi', mock.Mock())
+    @mock.patch(
+        'ironic_python_agent.hardware_managers.cna._detect_cna_card',
+        mock.Mock())
     @mock.patch.object(agent.IronicPythonAgent,
                        '_wait_for_interface', autospec=True)
     @mock.patch.object(hardware, 'dispatch_to_managers', autospec=True)
@@ -203,6 +207,9 @@ class TestBaseAgent(test_base.BaseTestCase):
         mock_dispatch.assert_called_once_with("list_hardware_info")
         self.agent.heartbeater.start.assert_called_once_with()
 
+    @mock.patch.object(hardware, '_check_for_iscsi', mock.Mock())
+    @mock.patch('ironic_python_agent.hardware_managers.cna._detect_cna_card',
+                mock.Mock())
     @mock.patch.object(agent.IronicPythonAgent,
                        '_wait_for_interface', autospec=True)
     @mock.patch.object(inspector, 'inspect', autospec=True)
@@ -249,6 +256,10 @@ class TestBaseAgent(test_base.BaseTestCase):
         mock_dispatch.assert_called_once_with("list_hardware_info")
         self.agent.heartbeater.start.assert_called_once_with()
 
+    @mock.patch.object(hardware, '_check_for_iscsi', mock.Mock())
+    @mock.patch(
+        'ironic_python_agent.hardware_managers.cna._detect_cna_card',
+        mock.Mock())
     @mock.patch.object(agent.IronicPythonAgent,
                        '_wait_for_interface', autospec=True)
     @mock.patch.object(inspector, 'inspect', autospec=True)
@@ -298,6 +309,10 @@ class TestBaseAgent(test_base.BaseTestCase):
         self.assertFalse(mock_wait.called)
         self.assertFalse(mock_dispatch.called)
 
+    @mock.patch.object(hardware, '_check_for_iscsi', mock.Mock())
+    @mock.patch(
+        'ironic_python_agent.hardware_managers.cna._detect_cna_card',
+        mock.Mock())
     @mock.patch.object(agent.IronicPythonAgent,
                        '_wait_for_interface', autospec=True)
     @mock.patch.object(inspector, 'inspect', autospec=True)
@@ -497,7 +512,7 @@ class TestBaseAgent(test_base.BaseTestCase):
 
 @mock.patch.object(hardware.GenericHardwareManager, '_wait_for_disks',
                    lambda self: None)
-class TestAgentStandalone(test_base.BaseTestCase):
+class TestAgentStandalone(ironic_agent_base.IronicAgentTest):
 
     def setUp(self):
         super(TestAgentStandalone, self).setUp()
@@ -515,6 +530,10 @@ class TestAgentStandalone(test_base.BaseTestCase):
                                              'agent_ipmitool',
                                              True)
 
+    @mock.patch.object(hardware, '_check_for_iscsi', mock.Mock())
+    @mock.patch(
+        'ironic_python_agent.hardware_managers.cna._detect_cna_card',
+        mock.Mock())
     @mock.patch('wsgiref.simple_server.make_server', autospec=True)
     @mock.patch.object(hardware.HardwareManager, 'list_hardware_info',
                        autospec=True)
@@ -551,7 +570,7 @@ class TestAgentStandalone(test_base.BaseTestCase):
                    lambda self: None)
 @mock.patch.object(socket, 'gethostbyname', autospec=True)
 @mock.patch.object(utils, 'execute', autospec=True)
-class TestAdvertiseAddress(test_base.BaseTestCase):
+class TestAdvertiseAddress(ironic_agent_base.IronicAgentTest):
     def setUp(self):
         super(TestAdvertiseAddress, self).setUp()
 
diff --git a/ironic_python_agent/tests/unit/test_api.py b/ironic_python_agent/tests/unit/test_api.py
index 4ffbc1665..ce8def0da 100644
--- a/ironic_python_agent/tests/unit/test_api.py
+++ b/ironic_python_agent/tests/unit/test_api.py
@@ -15,18 +15,18 @@
 import time
 
 import mock
-from oslotest import base as test_base
 import pecan
 import pecan.testing
 
 from ironic_python_agent import agent
 from ironic_python_agent.extensions import base
+from ironic_python_agent.tests.unit import base as ironic_agent_base
 
 
 PATH_PREFIX = '/v1'
 
 
-class TestIronicAPI(test_base.BaseTestCase):
+class TestIronicAPI(ironic_agent_base.IronicAgentTest):
 
     def setUp(self):
         super(TestIronicAPI, self).setUp()
diff --git a/ironic_python_agent/tests/unit/test_encoding.py b/ironic_python_agent/tests/unit/test_encoding.py
index a54dc6ef7..64cd9b636 100644
--- a/ironic_python_agent/tests/unit/test_encoding.py
+++ b/ironic_python_agent/tests/unit/test_encoding.py
@@ -12,9 +12,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from oslotest import base as test_base
-
 from ironic_python_agent import encoding
+from ironic_python_agent.tests.unit import base
 
 
 class SerializableTesting(encoding.Serializable):
@@ -33,7 +32,7 @@ class SerializableComparableTesting(encoding.SerializableComparable):
         self.jill = jill
 
 
-class TestSerializable(test_base.BaseTestCase):
+class TestSerializable(base.IronicAgentTest):
     def test_baseclass_serialize(self):
         obj = encoding.Serializable()
         self.assertEqual({}, obj.serialize())
@@ -44,7 +43,7 @@ class TestSerializable(test_base.BaseTestCase):
         self.assertEqual(expected, obj.serialize())
 
 
-class TestSerializableComparable(test_base.BaseTestCase):
+class TestSerializableComparable(base.IronicAgentTest):
 
     def test_childclass_equal(self):
         obj1 = SerializableComparableTesting('hello', 'world')
diff --git a/ironic_python_agent/tests/unit/test_errors.py b/ironic_python_agent/tests/unit/test_errors.py
index 40aa93996..8ebcb8f8b 100644
--- a/ironic_python_agent/tests/unit/test_errors.py
+++ b/ironic_python_agent/tests/unit/test_errors.py
@@ -12,9 +12,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from oslotest import base as test_base
-
 from ironic_python_agent import errors
+from ironic_python_agent.tests.unit import base
 
 DETAILS = 'details'
 SAME_CL_DETAILS = 'same_as_class_details'
@@ -32,7 +31,7 @@ class TestError(errors.RESTError):
         super(TestError, self).__init__(details)
 
 
-class TestErrors(test_base.BaseTestCase):
+class TestErrors(base.IronicAgentTest):
 
     def test_RESTError(self):
         e = errors.RESTError()
diff --git a/ironic_python_agent/tests/unit/test_hardware.py b/ironic_python_agent/tests/unit/test_hardware.py
index f7b0de5c6..b637cfaed 100644
--- a/ironic_python_agent/tests/unit/test_hardware.py
+++ b/ironic_python_agent/tests/unit/test_hardware.py
@@ -22,12 +22,12 @@ import netifaces
 from oslo_concurrency import processutils
 from oslo_config import cfg
 from oslo_utils import units
-from oslotest import base as test_base
 import pyudev
 from stevedore import extension
 
 from ironic_python_agent import errors
 from ironic_python_agent import hardware
+from ironic_python_agent.tests.unit import base
 from ironic_python_agent import utils
 
 CONF = cfg.CONF
@@ -257,7 +257,7 @@ class FakeHardwareManager(hardware.GenericHardwareManager):
         return self._hardware_support
 
 
-class TestHardwareManagerLoading(test_base.BaseTestCase):
+class TestHardwareManagerLoading(base.IronicAgentTest):
     def setUp(self):
         super(TestHardwareManagerLoading, self).setUp()
         # In order to use ExtensionManager.make_test_instance() without
@@ -286,7 +286,7 @@ class TestHardwareManagerLoading(test_base.BaseTestCase):
 
 
 @mock.patch.object(hardware, '_udev_settle', lambda *_: None)
-class TestGenericHardwareManager(test_base.BaseTestCase):
+class TestGenericHardwareManager(base.IronicAgentTest):
     def setUp(self):
         super(TestGenericHardwareManager, self).setUp()
         self.hardware = hardware.GenericHardwareManager()
@@ -784,6 +784,9 @@ class TestGenericHardwareManager(test_base.BaseTestCase):
         self.hardware.get_boot_info.return_value = hardware.BootInfo(
             current_boot_mode='bios', pxe_interface='boot:if')
 
+        self.hardware.get_bmc_address = mock.Mock()
+        self.hardware.get_system_vendor_info = mock.Mock()
+
         hardware_info = self.hardware.list_hardware_info()
         self.assertEqual(self.hardware.get_memory(), hardware_info['memory'])
         self.assertEqual(self.hardware.get_cpus(), hardware_info['cpu'])
@@ -1490,6 +1493,7 @@ class TestGenericHardwareManager(test_base.BaseTestCase):
         self.assertEqual(2, mocked_root_dev.call_count)
         mocked_sleep.assert_called_once_with(CONF.disk_wait_delay)
 
+    @mock.patch.object(hardware, '_check_for_iscsi', mock.Mock())
     @mock.patch.object(hardware.GenericHardwareManager, 'list_block_devices',
                        autospec=True)
     @mock.patch.object(time, 'sleep', autospec=True)
@@ -1517,6 +1521,7 @@ class TestGenericHardwareManager(test_base.BaseTestCase):
         mocked_root_dev.assert_called_with(mocked_block_dev.return_value)
         self.assertEqual(10, mocked_root_dev.call_count)
 
+    @mock.patch.object(hardware, '_check_for_iscsi', mock.Mock())
     @mock.patch.object(hardware.GenericHardwareManager, 'list_block_devices',
                        autospec=True)
     @mock.patch.object(time, 'sleep', autospec=True)
@@ -1539,6 +1544,7 @@ class TestGenericHardwareManager(test_base.BaseTestCase):
         mocked_root_dev.assert_called_with(mocked_block_dev.return_value)
         self.assertEqual(2, mocked_root_dev.call_count)
 
+    @mock.patch.object(hardware, '_check_for_iscsi', mock.Mock())
     @mock.patch.object(hardware.GenericHardwareManager, 'list_block_devices',
                        autospec=True)
     @mock.patch.object(time, 'sleep', autospec=True)
@@ -1552,6 +1558,7 @@ class TestGenericHardwareManager(test_base.BaseTestCase):
 
         mocked_sleep.assert_called_with(3)
 
+    @mock.patch.object(hardware, '_check_for_iscsi', mock.Mock())
     @mock.patch.object(hardware.GenericHardwareManager, 'list_block_devices',
                        autospec=True)
     @mock.patch.object(time, 'sleep', autospec=True)
@@ -1611,7 +1618,7 @@ class TestGenericHardwareManager(test_base.BaseTestCase):
 
 @mock.patch.object(os, 'listdir', lambda *_: [])
 @mock.patch.object(utils, 'execute', autospec=True)
-class TestModuleFunctions(test_base.BaseTestCase):
+class TestModuleFunctions(base.IronicAgentTest):
 
     @mock.patch.object(hardware, '_get_device_info',
                        lambda x, y, z: 'FooTastic')
diff --git a/ironic_python_agent/tests/unit/test_inspector.py b/ironic_python_agent/tests/unit/test_inspector.py
index 0847e5811..63401b986 100644
--- a/ironic_python_agent/tests/unit/test_inspector.py
+++ b/ironic_python_agent/tests/unit/test_inspector.py
@@ -21,13 +21,13 @@ import time
 import mock
 from oslo_concurrency import processutils
 from oslo_config import cfg
-from oslotest import base as test_base
 import requests
 import stevedore
 
 from ironic_python_agent import errors
 from ironic_python_agent import hardware
 from ironic_python_agent import inspector
+from ironic_python_agent.tests.unit import base
 from ironic_python_agent import utils
 
 
@@ -46,7 +46,7 @@ class AcceptingFailure(mock.Mock):
             failure, expect_error)
 
 
-class TestMisc(test_base.BaseTestCase):
+class TestMisc(base.IronicAgentTest):
     def test_default_collector_loadable(self):
         ext = inspector.extension_manager([inspector.DEFAULT_COLLECTOR])
         self.assertIs(ext[inspector.DEFAULT_COLLECTOR].plugin,
@@ -62,7 +62,7 @@ class TestMisc(test_base.BaseTestCase):
 @mock.patch.object(inspector, 'setup_ipmi_credentials', autospec=True)
 @mock.patch.object(inspector, 'call_inspector', new_callable=AcceptingFailure)
 @mock.patch.object(stevedore, 'NamedExtensionManager', autospec=True)
-class TestInspect(test_base.BaseTestCase):
+class TestInspect(base.IronicAgentTest):
     def setUp(self):
         super(TestInspect, self).setUp()
         CONF.set_override('inspection_callback_url', 'http://foo/bar',
@@ -131,7 +131,7 @@ class TestInspect(test_base.BaseTestCase):
 
 
 @mock.patch.object(requests, 'post', autospec=True)
-class TestCallInspector(test_base.BaseTestCase):
+class TestCallInspector(base.IronicAgentTest):
     def setUp(self):
         super(TestCallInspector, self).setUp()
         CONF.set_override('inspection_callback_url', 'url',
@@ -176,7 +176,7 @@ class TestCallInspector(test_base.BaseTestCase):
 
 
 @mock.patch.object(utils, 'execute', autospec=True)
-class TestSetupIpmiCredentials(test_base.BaseTestCase):
+class TestSetupIpmiCredentials(base.IronicAgentTest):
     def setUp(self):
         super(TestSetupIpmiCredentials, self).setUp()
         self.resp = {'ipmi_username': 'user',
@@ -227,7 +227,7 @@ class TestSetupIpmiCredentials(test_base.BaseTestCase):
         self.assertEqual(expected, mock_call.call_args_list)
 
 
-class BaseDiscoverTest(test_base.BaseTestCase):
+class BaseDiscoverTest(base.IronicAgentTest):
     def setUp(self):
         super(BaseDiscoverTest, self).setUp()
         self.inventory = {
@@ -302,7 +302,7 @@ class TestCollectDefault(BaseDiscoverTest):
 
 
 @mock.patch.object(utils, 'collect_system_logs', autospec=True)
-class TestCollectLogs(test_base.BaseTestCase):
+class TestCollectLogs(base.IronicAgentTest):
 
     def test(self, mock_collect):
         data = {}
@@ -320,7 +320,7 @@ class TestCollectLogs(test_base.BaseTestCase):
 
 
 @mock.patch.object(utils, 'execute', autospec=True)
-class TestCollectExtraHardware(test_base.BaseTestCase):
+class TestCollectExtraHardware(base.IronicAgentTest):
     def setUp(self):
         super(TestCollectExtraHardware, self).setUp()
         self.data = {}
@@ -366,7 +366,7 @@ class TestCollectExtraHardware(test_base.BaseTestCase):
 
 
 @mock.patch.object(os, 'listdir', autospec=True)
-class TestCollectPciDevicesInfo(test_base.BaseTestCase):
+class TestCollectPciDevicesInfo(base.IronicAgentTest):
     def setUp(self):
         super(TestCollectPciDevicesInfo, self).setUp()
         self.data = {}
@@ -421,7 +421,7 @@ class TestCollectPciDevicesInfo(test_base.BaseTestCase):
 
 @mock.patch.object(utils, 'get_agent_params', lambda: {'BOOTIF': '01-cdef'})
 @mock.patch.object(hardware, 'dispatch_to_managers', autospec=True)
-class TestWaitForDhcp(test_base.BaseTestCase):
+class TestWaitForDhcp(base.IronicAgentTest):
     def setUp(self):
         super(TestWaitForDhcp, self).setUp()
         CONF.set_override('inspection_dhcp_wait_timeout',
@@ -507,7 +507,7 @@ class TestWaitForDhcp(test_base.BaseTestCase):
         self.assertFalse(mocked_dispatch.called)
 
 
-class TestNormalizeMac(test_base.BaseTestCase):
+class TestNormalizeMac(base.IronicAgentTest):
     def test_correct_mac(self):
         self.assertEqual('11:22:33:aa:bb:cc',
                          inspector._normalize_mac('11:22:33:aa:BB:cc'))
diff --git a/ironic_python_agent/tests/unit/test_ironic_api_client.py b/ironic_python_agent/tests/unit/test_ironic_api_client.py
index abcdbfa57..6d7c2a47d 100644
--- a/ironic_python_agent/tests/unit/test_ironic_api_client.py
+++ b/ironic_python_agent/tests/unit/test_ironic_api_client.py
@@ -15,11 +15,11 @@
 import mock
 from oslo_serialization import jsonutils
 from oslo_service import loopingcall
-from oslotest import base as test_base
 
 from ironic_python_agent import errors
 from ironic_python_agent import hardware
 from ironic_python_agent import ironic_api_client
+from ironic_python_agent.tests.unit import base
 
 API_URL = 'http://agent-api.ironic.example.org/'
 
@@ -32,7 +32,7 @@ class FakeResponse(object):
         self.headers = headers or {}
 
 
-class TestBaseIronicPythonAgent(test_base.BaseTestCase):
+class TestBaseIronicPythonAgent(base.IronicAgentTest):
     def setUp(self):
         super(TestBaseIronicPythonAgent, self).setUp()
         self.api_client = ironic_api_client.APIClient(API_URL)
diff --git a/ironic_python_agent/tests/unit/test_multi_hardware.py b/ironic_python_agent/tests/unit/test_multi_hardware.py
index 9374707e1..7849cf236 100644
--- a/ironic_python_agent/tests/unit/test_multi_hardware.py
+++ b/ironic_python_agent/tests/unit/test_multi_hardware.py
@@ -15,11 +15,11 @@
 import collections
 
 import mock
-from oslotest import base as test_base
 from stevedore import extension
 
 from ironic_python_agent import errors
 from ironic_python_agent import hardware
+from ironic_python_agent.tests.unit import base
 
 
 def counted(fn):
@@ -105,7 +105,7 @@ class FakeMainlineHardwareManager(hardware.HardwareManager):
         return hardware.HardwareSupport.MAINLINE
 
 
-class TestMultipleHardwareManagerLoading(test_base.BaseTestCase):
+class TestMultipleHardwareManagerLoading(base.IronicAgentTest):
     def setUp(self):
         super(TestMultipleHardwareManagerLoading, self).setUp()
         fake_ep = mock.Mock()
@@ -120,14 +120,11 @@ class TestMultipleHardwareManagerLoading(test_base.BaseTestCase):
 
         self.extension_mgr_patcher = mock.patch('stevedore.ExtensionManager',
                                                 autospec=True)
+        self.addCleanup(self.extension_mgr_patcher.stop)
         self.mocked_extension_mgr = self.extension_mgr_patcher.start()
         self.mocked_extension_mgr.return_value = self.fake_ext_mgr
         hardware._global_managers = None
 
-    def tearDown(self):
-        super(TestMultipleHardwareManagerLoading, self).tearDown()
-        self.extension_mgr_patcher.stop()
-
     def test_mainline_method_only(self):
         hardware.dispatch_to_managers('specific_only')
 
@@ -212,7 +209,7 @@ class TestMultipleHardwareManagerLoading(test_base.BaseTestCase):
                           'unexpected_fail')
 
 
-class TestNoHardwareManagerLoading(test_base.BaseTestCase):
+class TestNoHardwareManagerLoading(base.IronicAgentTest):
     def setUp(self):
         super(TestNoHardwareManagerLoading, self).setUp()
         self.empty_ext_mgr = extension.ExtensionManager.make_test_instance([])
diff --git a/ironic_python_agent/tests/unit/test_multi_hardware_clean_steps.py b/ironic_python_agent/tests/unit/test_multi_hardware_clean_steps.py
index 104bbbb50..ef47124e6 100644
--- a/ironic_python_agent/tests/unit/test_multi_hardware_clean_steps.py
+++ b/ironic_python_agent/tests/unit/test_multi_hardware_clean_steps.py
@@ -13,11 +13,11 @@
 # limitations under the License.
 
 import mock
-from oslotest import base as test_base
 from stevedore import extension
 
 from ironic_python_agent.extensions import clean
 from ironic_python_agent import hardware
+from ironic_python_agent.tests.unit import base
 
 
 def _build_clean_step(name, priority, reboot=False, abort=False):
@@ -53,7 +53,7 @@ class ZFakeGenericHardwareManager(hardware.HardwareManager):
                 _build_clean_step('ZHigherPrio', 100)]
 
 
-class TestMultipleHardwareManagerCleanSteps(test_base.BaseTestCase):
+class TestMultipleHardwareManagerCleanSteps(base.IronicAgentTest):
     def setUp(self):
         super(TestMultipleHardwareManagerCleanSteps, self).setUp()
 
@@ -73,14 +73,11 @@ class TestMultipleHardwareManagerCleanSteps(test_base.BaseTestCase):
 
         self.extension_mgr_patcher = mock.patch('stevedore.ExtensionManager',
                                                 autospec=True)
+        self.addCleanup(self.extension_mgr_patcher.stop)
         self.mocked_extension_mgr = self.extension_mgr_patcher.start()
         self.mocked_extension_mgr.return_value = self.fake_ext_mgr
         hardware._global_managers = None
 
-    def tearDown(self):
-        super(TestMultipleHardwareManagerCleanSteps, self).tearDown()
-        self.extension_mgr_patcher.stop()
-
     def test_clean_step_ordering(self):
         as_results = self.agent_extension.get_clean_steps(node={}, ports=[])
         results = as_results.join().command_result
diff --git a/ironic_python_agent/tests/unit/test_netutils.py b/ironic_python_agent/tests/unit/test_netutils.py
index db9f84142..4237b155b 100644
--- a/ironic_python_agent/tests/unit/test_netutils.py
+++ b/ironic_python_agent/tests/unit/test_netutils.py
@@ -16,9 +16,9 @@ import binascii
 
 import mock
 from oslo_config import cfg
-from oslotest import base as test_base
 
 from ironic_python_agent import netutils
+from ironic_python_agent.tests.unit import base
 
 # hexlify-ed output from LLDP packet
 FAKE_LLDP_PACKET = binascii.unhexlify(
@@ -37,7 +37,7 @@ def socket_socket_sig(family=None, type=None, proto=None):
     pass
 
 
-class TestNetutils(test_base.BaseTestCase):
+class TestNetutils(base.IronicAgentTest):
     def setUp(self):
         super(TestNetutils, self).setUp()
 
diff --git a/ironic_python_agent/tests/unit/test_utils.py b/ironic_python_agent/tests/unit/test_utils.py
index dab7c14a9..31c9988b3 100644
--- a/ironic_python_agent/tests/unit/test_utils.py
+++ b/ironic_python_agent/tests/unit/test_utils.py
@@ -31,9 +31,14 @@ import six
 import testtools
 
 from ironic_python_agent import errors
+from ironic_python_agent.tests.unit import base as ironic_agent_base
 from ironic_python_agent import utils
 
 
+# Normally we'd use the IronicAgentTest base class which mocks out
+# any use of utils.execute() to prevent accidental processes. However
+# this test is checking the upcall to ironic_lib's execute(), so that
+# is mocked out instead.
 class ExecuteTestCase(test_base.BaseTestCase):
 
     @mock.patch.object(ironic_utils, 'execute', autospec=True)
@@ -43,7 +48,7 @@ class ExecuteTestCase(test_base.BaseTestCase):
                                              check_exit_code=False)
 
 
-class GetAgentParamsTestCase(test_base.BaseTestCase):
+class GetAgentParamsTestCase(ironic_agent_base.IronicAgentTest):
 
     @mock.patch('oslo_log.log.getLogger', autospec=True)
     @mock.patch('six.moves.builtins.open', autospec=True)