diff --git a/patrole_tempest_plugin/tests/api/identity/rbac_base.py b/patrole_tempest_plugin/tests/api/identity/rbac_base.py
index 4321c60..aa5cd4b 100644
--- a/patrole_tempest_plugin/tests/api/identity/rbac_base.py
+++ b/patrole_tempest_plugin/tests/api/identity/rbac_base.py
@@ -77,7 +77,6 @@
 class BaseIdentityV3RbacTest(BaseIdentityRbacTest):
 
     identity_version = 'v3'
-    credentials = ['primary']
 
     @classmethod
     def setup_clients(cls):
diff --git a/patrole_tempest_plugin/tests/api/identity/v3/test_tokens_negative_rbac.py b/patrole_tempest_plugin/tests/api/identity/v3/test_tokens_negative_rbac.py
index 16a7893..45eb601 100644
--- a/patrole_tempest_plugin/tests/api/identity/v3/test_tokens_negative_rbac.py
+++ b/patrole_tempest_plugin/tests/api/identity/v3/test_tokens_negative_rbac.py
@@ -23,7 +23,7 @@
 
 class IdentityTokenV3RbacTest(rbac_base.BaseIdentityV3RbacTest):
 
-    credentials = ['primary', 'alt']
+    credentials = ['primary', 'alt', 'admin']
 
     @classmethod
     def skip_checks(cls):
diff --git a/patrole_tempest_plugin/tests/api/identity/v3/test_trusts_rbac.py b/patrole_tempest_plugin/tests/api/identity/v3/test_trusts_rbac.py
index 23c75c6..da29433 100644
--- a/patrole_tempest_plugin/tests/api/identity/v3/test_trusts_rbac.py
+++ b/patrole_tempest_plugin/tests/api/identity/v3/test_trusts_rbac.py
@@ -27,7 +27,7 @@
 
 class IdentityTrustV3RbacTest(rbac_base.BaseIdentityV3RbacTest):
 
-    credentials = ['primary', 'alt']
+    credentials = ['primary', 'alt', 'admin']
 
     @classmethod
     def skip_checks(cls):
diff --git a/patrole_tempest_plugin/tests/api/image/test_images_member_rbac.py b/patrole_tempest_plugin/tests/api/image/test_images_member_rbac.py
index 43a5e57..9450676 100644
--- a/patrole_tempest_plugin/tests/api/image/test_images_member_rbac.py
+++ b/patrole_tempest_plugin/tests/api/image/test_images_member_rbac.py
@@ -21,7 +21,7 @@
 
 class ImagesMemberRbacTest(base.BaseV2ImageRbacTest):
 
-    credentials = ['primary', 'alt']
+    credentials = ['primary', 'alt', 'admin']
 
     @classmethod
     def resource_setup(cls):
diff --git a/patrole_tempest_plugin/tests/unit/fixtures.py b/patrole_tempest_plugin/tests/unit/fixtures.py
index 98eb66c..01b99db 100644
--- a/patrole_tempest_plugin/tests/unit/fixtures.py
+++ b/patrole_tempest_plugin/tests/unit/fixtures.py
@@ -19,7 +19,6 @@
 import fixtures
 import time
 
-from tempest.common import credentials_factory as credentials
 from tempest import config
 from tempest import test
 
@@ -55,6 +54,7 @@
 
 
 class FakeBaseRbacTest(rbac_utils.RbacUtilsMixin, test.BaseTestCase):
+    credentials = []
     os_primary = None
 
     def runTest(self):
@@ -91,13 +91,20 @@
         # time.sleep is a test optimization.
         self.mock_time = self.patchobject(rbac_utils, 'time',
                                           __name__='mock_time', spec=time)
-        self.patchobject(credentials, 'get_configured_admin_credentials',
-                         spec=object)
-        mock_admin_mgr = self.patchobject(rbac_utils.clients, 'Manager',
-                                          spec=rbac_utils.clients.Manager,
-                                          roles_v3_client=mock.Mock(),
-                                          roles_client=mock.Mock())
-        self.admin_roles_client = mock_admin_mgr.return_value.roles_v3_client
+
+        test_obj_kwargs = {
+            'credentials.user_id': self.USER_ID,
+            'credentials.tenant_id': self.PROJECT_ID,
+            'credentials.project_id': self.PROJECT_ID,
+        }
+
+        class FakeRbacTest(FakeBaseRbacTest):
+            os_primary = mock.Mock()
+            os_admin = mock.Mock()
+
+        FakeRbacTest.os_primary.configure_mock(**test_obj_kwargs)
+
+        self.admin_roles_client = FakeRbacTest.os_admin.roles_v3_client
         self.admin_roles_client.list_all_role_inference_rules.return_value = {
             "role_inferences": [
                 {
@@ -115,22 +122,12 @@
             set(self._rbac_test_roles))
         self.set_roles(list(default_roles), [])
 
-        test_obj_kwargs = {
-            'credentials.user_id': self.USER_ID,
-            'credentials.tenant_id': self.PROJECT_ID,
-            'credentials.project_id': self.PROJECT_ID,
-        }
-
-        class FakeRbacTest(FakeBaseRbacTest):
-            os_primary = mock.Mock()
-
-        FakeRbacTest.os_primary.configure_mock(**test_obj_kwargs)
-
         FakeRbacTest.setUpClass()
         self.test_obj = FakeRbacTest()
         if self._do_reset_mocks:
             self.admin_roles_client.reset_mock()
             self.test_obj.os_primary.reset_mock()
+            self.test_obj.os_admin.reset_mock()
             self.mock_time.reset_mock()
 
     def set_roles(self, roles, roles_on_project=None):
diff --git a/patrole_tempest_plugin/tests/unit/test_policy_authority.py b/patrole_tempest_plugin/tests/unit/test_policy_authority.py
index cdc9e15..fc7cafb 100644
--- a/patrole_tempest_plugin/tests/unit/test_policy_authority.py
+++ b/patrole_tempest_plugin/tests/unit/test_policy_authority.py
@@ -40,11 +40,12 @@
 
     def setUp(self):
         super(PolicyAuthorityTest, self).setUp()
-        self.patchobject(policy_authority, 'credentials')
-        m_creds = self.patchobject(policy_authority, 'clients')
-        m_creds.Manager().identity_services_client.list_services.\
+
+        mock_admin = self.patchobject(policy_authority.PolicyAuthority,
+                                      'os_admin')
+        mock_admin.identity_services_client.list_services.\
             return_value = self.services
-        m_creds.Manager().identity_services_v3_client.list_services.\
+        mock_admin.identity_services_v3_client.list_services.\
             return_value = self.services
 
         current_directory = os.path.dirname(os.path.realpath(__file__))
@@ -492,11 +493,12 @@
     @mock.patch.object(policy_authority, 'policy', autospec=True)
     @mock.patch.object(policy_authority.PolicyAuthority, 'get_rules',
                        autospec=True)
-    @mock.patch.object(policy_authority, 'clients', autospec=True)
+    @mock.patch.object(policy_authority.PolicyAuthority, 'os_admin',
+                       autospec=True)
     @mock.patch.object(policy_authority, 'os', autospec=True)
     @mock.patch.object(policy_authority, 'glob', autospec=True)
     def test_discover_policy_files_with_many_invalid_one_valid(self, m_glob,
-                                                               m_os, m_creds,
+                                                               m_os, m_admin,
                                                                *args):
         service = 'test_service'
         custom_policy_files = ['foo/%s', 'bar/%s', 'baz/%s']
@@ -506,7 +508,7 @@
         m_os.path.isfile.side_effect = [False, False, True]
 
         # Ensure the outer for loop runs only once in `discover_policy_files`.
-        m_creds.Manager().identity_services_v3_client.\
+        m_admin.identity_services_v3_client.\
             list_services.return_value = {
                 'services': [{'name': service}]}
 
@@ -545,11 +547,11 @@
 
     def _test_validate_service(self, v2_services, v3_services,
                                expected_failure=False, expected_services=None):
-        with mock.patch.object(
-            policy_authority, 'clients', autospec=True) as m_creds:
-            m_creds.Manager().identity_services_client.list_services.\
+        with mock.patch.object(policy_authority.PolicyAuthority, 'os_admin',
+                               autospec=True) as m_admin:
+            m_admin.identity_services_client.list_services.\
                 return_value = v2_services
-            m_creds.Manager().identity_services_v3_client.list_services.\
+            m_admin.identity_services_v3_client.list_services.\
                 return_value = v3_services
 
         test_tenant_id = mock.sentinel.tenant_id