diff --git a/ironic_inspector/plugins/base.py b/ironic_inspector/plugins/base.py
index 3d2a12a5b..87d807dc4 100644
--- a/ironic_inspector/plugins/base.py
+++ b/ironic_inspector/plugins/base.py
@@ -145,6 +145,21 @@ _ACTIONS_MGR = None
 _INTROSPECTION_DATA_MGR = None
 
 
+def reset():
+    """Reset cached managers."""
+    global _HOOKS_MGR
+    global _NOT_FOUND_HOOK_MGR
+    global _CONDITIONS_MGR
+    global _ACTIONS_MGR
+    global _INTROSPECTION_DATA_MGR
+
+    _HOOKS_MGR = None
+    _NOT_FOUND_HOOK_MGR = None
+    _CONDITIONS_MGR = None
+    _ACTIONS_MGR = None
+    _INTROSPECTION_DATA_MGR = None
+
+
 def missing_entrypoints_callback(names):
     """Raise MissingHookError with comma-separated list of missing hooks"""
     error = _('The following hook(s) are missing or failed to load: %s')
diff --git a/ironic_inspector/test/base.py b/ironic_inspector/test/base.py
index 12c8605d1..2a3b66dd5 100644
--- a/ironic_inspector/test/base.py
+++ b/ironic_inspector/test/base.py
@@ -50,7 +50,7 @@ class BaseTest(test_base.BaseTestCase):
         db.Base.metadata.create_all(engine)
         engine.connect()
         self.addCleanup(engine.dispose)
-        plugins_base._HOOKS_MGR = None
+        plugins_base.reset()
         node_cache._SEMAPHORES = lockutils.Semaphores()
         patch = mock.patch.object(i18n, '_', lambda s: s)
         patch.start()
diff --git a/ironic_inspector/test/unit/test_main.py b/ironic_inspector/test/unit/test_main.py
index 800701bed..690f8ce70 100644
--- a/ironic_inspector/test/unit/test_main.py
+++ b/ironic_inspector/test/unit/test_main.py
@@ -659,7 +659,6 @@ class TestPlugins(unittest.TestCase):
     @mock.patch.object(example_plugin.ExampleProcessingHook,
                        'before_update', autospec=True)
     def test_hook(self, mock_post, mock_pre):
-        plugins_base._HOOKS_MGR = None
         CONF.set_override('processing_hooks', 'example', 'processing')
         mgr = plugins_base.processing_hooks_manager()
         mgr.map_method('before_processing', 'introspection_data')
diff --git a/ironic_inspector/test/unit/test_process.py b/ironic_inspector/test/unit/test_process.py
index 297985aa0..3d89630ac 100644
--- a/ironic_inspector/test/unit/test_process.py
+++ b/ironic_inspector/test/unit/test_process.py
@@ -209,7 +209,6 @@ class TestProcess(BaseProcessTest):
         self.assertFalse(self.node_info.finished.called)
 
     def test_error_if_node_not_found_hook(self):
-        plugins_base._NOT_FOUND_HOOK_MGR = None
         self.find_mock.side_effect = utils.NotFoundInCacheError('BOOM')
         self.assertRaisesRegex(utils.Error,
                                'Look up error: BOOM',
@@ -221,7 +220,6 @@ class TestProcess(BaseProcessTest):
 class TestNodeNotFoundHook(BaseProcessTest):
     def test_node_not_found_hook_run_ok(self, hook_mock):
         CONF.set_override('node_not_found_hook', 'example', 'processing')
-        plugins_base._NOT_FOUND_HOOK_MGR = None
         self.find_mock.side_effect = utils.NotFoundInCacheError('BOOM')
         hook_mock.return_value = node_cache.NodeInfo(
             uuid=self.node.uuid,
@@ -232,7 +230,6 @@ class TestNodeNotFoundHook(BaseProcessTest):
 
     def test_node_not_found_hook_run_none(self, hook_mock):
         CONF.set_override('node_not_found_hook', 'example', 'processing')
-        plugins_base._NOT_FOUND_HOOK_MGR = None
         self.find_mock.side_effect = utils.NotFoundInCacheError('BOOM')
         hook_mock.return_value = None
         self.assertRaisesRegex(utils.Error,
@@ -242,7 +239,6 @@ class TestNodeNotFoundHook(BaseProcessTest):
 
     def test_node_not_found_hook_exception(self, hook_mock):
         CONF.set_override('node_not_found_hook', 'example', 'processing')
-        plugins_base._NOT_FOUND_HOOK_MGR = None
         self.find_mock.side_effect = utils.NotFoundInCacheError('BOOM')
         hook_mock.side_effect = Exception('Hook Error')
         self.assertRaisesRegex(utils.Error,
@@ -398,7 +394,6 @@ class TestProcessNode(BaseTest):
                 started_at=self.node_info.started_at,
                 finished_at=self.node_info.finished_at,
                 error=self.node_info.error).save(self.session)
-        plugins_base._INTROSPECTION_DATA_MGR = None
 
     def test_return_includes_uuid(self):
         ret_val = process._process_node(self.node_info, self.node, self.data)
@@ -670,7 +665,6 @@ class TestReapplyNode(BaseTest):
                              post_hook_mock):
         CONF.set_override('processing_hooks', 'example',
                           'processing')
-        plugins_base._HOOKS_MGR = None
 
         exc = Exception('Failed.')
         swift_mock.get_object.return_value = json.dumps(self.data)