diff --git a/tempest/api/compute/admin/test_flavors_access.py b/tempest/api/compute/admin/test_flavors_access.py
index 193d415..3ba7314 100644
--- a/tempest/api/compute/admin/test_flavors_access.py
+++ b/tempest/api/compute/admin/test_flavors_access.py
@@ -32,15 +32,12 @@
             msg = "FlavorExtraData extension not enabled."
             raise cls.skipException(msg)
 
+        # Compute admin flavor client
         cls.client = cls.os_adm.flavors_client
-        admin_client = cls._get_identity_admin_client()
-        cls.tenant = admin_client.get_tenant_by_name(cls.flavors_client.
-                                                     tenant_name)
-        cls.tenant_id = cls.tenant['id']
-        cls.adm_tenant = admin_client.get_tenant_by_name(cls.os_adm.
-                                                         flavors_client.
-                                                         tenant_name)
-        cls.adm_tenant_id = cls.adm_tenant['id']
+        # Non admin tenant ID
+        cls.tenant_id = cls.flavors_client.tenant_id
+        # Compute admin tenant ID
+        cls.adm_tenant_id = cls.client.tenant_id
         cls.flavor_name_prefix = 'test_flavor_access_'
         cls.ram = 512
         cls.vcpus = 1
diff --git a/tempest/api/compute/admin/test_flavors_access_negative.py b/tempest/api/compute/admin/test_flavors_access_negative.py
index 8fe3331..73834e9 100644
--- a/tempest/api/compute/admin/test_flavors_access_negative.py
+++ b/tempest/api/compute/admin/test_flavors_access_negative.py
@@ -36,14 +36,7 @@
             raise cls.skipException(msg)
 
         cls.client = cls.os_adm.flavors_client
-        admin_client = cls._get_identity_admin_client()
-        cls.tenant = admin_client.get_tenant_by_name(cls.flavors_client.
-                                                     tenant_name)
-        cls.tenant_id = cls.tenant['id']
-        cls.adm_tenant = admin_client.get_tenant_by_name(cls.os_adm.
-                                                         flavors_client.
-                                                         tenant_name)
-        cls.adm_tenant_id = cls.adm_tenant['id']
+        cls.tenant_id = cls.flavors_client.tenant_id
         cls.flavor_name_prefix = 'test_flavor_access_'
         cls.ram = 512
         cls.vcpus = 1
diff --git a/tempest/api/compute/admin/test_quotas.py b/tempest/api/compute/admin/test_quotas.py
index d6d5592..348666d 100644
--- a/tempest/api/compute/admin/test_quotas.py
+++ b/tempest/api/compute/admin/test_quotas.py
@@ -28,7 +28,7 @@
 
         # NOTE(afazekas): these test cases should always create and use a new
         # tenant most of them should be skipped if we can't do that
-        cls.demo_tenant_id = cls.isolated_creds.get_primary_creds().tenant_id
+        cls.demo_tenant_id = cls.quotas_client.tenant_id
 
         cls.default_quota_set = set(('injected_file_content_bytes',
                                      'metadata_items', 'injected_files',
diff --git a/tempest/api/compute/admin/test_quotas_negative.py b/tempest/api/compute/admin/test_quotas_negative.py
index 10c3243..e1dc685 100644
--- a/tempest/api/compute/admin/test_quotas_negative.py
+++ b/tempest/api/compute/admin/test_quotas_negative.py
@@ -33,7 +33,7 @@
 
         # NOTE(afazekas): these test cases should always create and use a new
         # tenant most of them should be skipped if we can't do that
-        cls.demo_tenant_id = cls.isolated_creds.get_primary_creds().tenant_id
+        cls.demo_tenant_id = cls.client.tenant_id
 
     @test.attr(type=['negative', 'gate'])
     def test_update_quota_normal_user(self):
diff --git a/tempest/api/compute/admin/test_servers_negative.py b/tempest/api/compute/admin/test_servers_negative.py
index 9fa07f6..8b3a0b5 100644
--- a/tempest/api/compute/admin/test_servers_negative.py
+++ b/tempest/api/compute/admin/test_servers_negative.py
@@ -37,10 +37,7 @@
         cls.client = cls.os_adm.servers_client
         cls.non_adm_client = cls.servers_client
         cls.flavors_client = cls.os_adm.flavors_client
-        cls.identity_client = cls._get_identity_admin_client()
-        tenant = cls.identity_client.get_tenant_by_name(
-            cls.client.tenant_name)
-        cls.tenant_id = tenant['id']
+        cls.tenant_id = cls.client.tenant_id
 
         cls.s1_name = data_utils.rand_name('server')
         resp, server = cls.create_test_server(name=cls.s1_name,
diff --git a/tempest/api/compute/admin/test_simple_tenant_usage.py b/tempest/api/compute/admin/test_simple_tenant_usage.py
index 33cd6f3..f3a81d1 100644
--- a/tempest/api/compute/admin/test_simple_tenant_usage.py
+++ b/tempest/api/compute/admin/test_simple_tenant_usage.py
@@ -27,11 +27,7 @@
         super(TenantUsagesTestJSON, cls).setUpClass()
         cls.adm_client = cls.os_adm.tenant_usages_client
         cls.client = cls.os.tenant_usages_client
-        cls.identity_client = cls._get_identity_admin_client()
-
-        resp, tenants = cls.identity_client.list_tenants()
-        cls.tenant_id = [tnt['id'] for tnt in tenants if tnt['name'] ==
-                         cls.client.tenant_name][0]
+        cls.tenant_id = cls.client.tenant_id
 
         # Create a server in the demo tenant
         resp, server = cls.create_test_server(wait_until='ACTIVE')
diff --git a/tempest/api/compute/admin/test_simple_tenant_usage_negative.py b/tempest/api/compute/admin/test_simple_tenant_usage_negative.py
index a080f2e..d69c43c 100644
--- a/tempest/api/compute/admin/test_simple_tenant_usage_negative.py
+++ b/tempest/api/compute/admin/test_simple_tenant_usage_negative.py
@@ -52,11 +52,9 @@
         params = {'start': self.end,
                   'end': self.start}
         resp, tenants = self.identity_client.list_tenants()
-        tenant_id = [tnt['id'] for tnt in tenants if tnt['name'] ==
-                     self.client.tenant_name][0]
         self.assertRaises(exceptions.BadRequest,
                           self.adm_client.get_tenant_usage,
-                          tenant_id, params)
+                          self.client.tenant_id, params)
 
     @test.attr(type=['negative', 'gate'])
     def test_list_usage_all_tenants_with_non_admin_user(self):
diff --git a/tempest/api/compute/servers/test_server_metadata_negative.py b/tempest/api/compute/servers/test_server_metadata_negative.py
index 8b69c78..b55833c 100644
--- a/tempest/api/compute/servers/test_server_metadata_negative.py
+++ b/tempest/api/compute/servers/test_server_metadata_negative.py
@@ -26,10 +26,7 @@
         super(ServerMetadataNegativeTestJSON, cls).setUpClass()
         cls.client = cls.servers_client
         cls.quotas = cls.quotas_client
-        cls.admin_client = cls._get_identity_admin_client()
-        resp, tenants = cls.admin_client.list_tenants()
-        cls.tenant_id = [tnt['id'] for tnt in tenants if tnt['name'] ==
-                         cls.client.tenant_name][0]
+        cls.tenant_id = cls.client.tenant_id
         resp, server = cls.create_test_server(meta={}, wait_until='ACTIVE')
 
         cls.server_id = server['id']
diff --git a/tempest/api/compute/test_quotas.py b/tempest/api/compute/test_quotas.py
index 4db8c56..dc85e76 100644
--- a/tempest/api/compute/test_quotas.py
+++ b/tempest/api/compute/test_quotas.py
@@ -23,13 +23,8 @@
     def setUpClass(cls):
         super(QuotasTestJSON, cls).setUpClass()
         cls.client = cls.quotas_client
-        cls.admin_client = cls._get_identity_admin_client()
-        resp, tenants = cls.admin_client.list_tenants()
-        cls.tenant_id = [tnt['id'] for tnt in tenants if tnt['name'] ==
-                         cls.client.tenant_name][0]
-        resp, users = cls.admin_client.list_users_for_tenant(cls.tenant_id)
-        cls.user_id = [user['id'] for user in users if user['name'] ==
-                       cls.client.user][0]
+        cls.tenant_id = cls.client.tenant_id
+        cls.user_id = cls.client.user_id
         cls.default_quota_set = set(('injected_file_content_bytes',
                                      'metadata_items', 'injected_files',
                                      'ram', 'floating_ips',
diff --git a/tempest/api/compute/v3/admin/test_flavors_access.py b/tempest/api/compute/v3/admin/test_flavors_access.py
index 03305ff..c641bf6 100644
--- a/tempest/api/compute/v3/admin/test_flavors_access.py
+++ b/tempest/api/compute/v3/admin/test_flavors_access.py
@@ -31,12 +31,8 @@
 
         cls.client = cls.flavors_admin_client
         admin_client = cls._get_identity_admin_client()
-        cls.tenant = admin_client.get_tenant_by_name(cls.flavors_client.
-                                                     tenant_name)
-        cls.tenant_id = cls.tenant['id']
-        cls.adm_tenant = admin_client.get_tenant_by_name(
-            cls.flavors_admin_client.tenant_name)
-        cls.adm_tenant_id = cls.adm_tenant['id']
+        cls.tenant_id = cls.client.tenant_id
+        cls.adm_tenant_id = admin_client.tenant_id
         cls.flavor_name_prefix = 'test_flavor_access_'
         cls.ram = 512
         cls.vcpus = 1
diff --git a/tempest/api/compute/v3/admin/test_flavors_access_negative.py b/tempest/api/compute/v3/admin/test_flavors_access_negative.py
index 334d124..02ecb24 100644
--- a/tempest/api/compute/v3/admin/test_flavors_access_negative.py
+++ b/tempest/api/compute/v3/admin/test_flavors_access_negative.py
@@ -33,13 +33,7 @@
         super(FlavorsAccessNegativeV3Test, cls).setUpClass()
 
         cls.client = cls.flavors_admin_client
-        admin_client = cls._get_identity_admin_client()
-        cls.tenant = admin_client.get_tenant_by_name(cls.flavors_client.
-                                                     tenant_name)
-        cls.tenant_id = cls.tenant['id']
-        cls.adm_tenant = admin_client.get_tenant_by_name(
-            cls.flavors_admin_client.tenant_name)
-        cls.adm_tenant_id = cls.adm_tenant['id']
+        cls.tenant_id = cls.client.tenant_id
         cls.flavor_name_prefix = 'test_flavor_access_'
         cls.ram = 512
         cls.vcpus = 1
diff --git a/tempest/api/compute/v3/admin/test_quotas.py b/tempest/api/compute/v3/admin/test_quotas.py
index 27836fb..19c31fe 100644
--- a/tempest/api/compute/v3/admin/test_quotas.py
+++ b/tempest/api/compute/v3/admin/test_quotas.py
@@ -32,7 +32,7 @@
 
         # NOTE(afazekas): these test cases should always create and use a new
         # tenant most of them should be skipped if we can't do that
-        cls.demo_tenant_id = cls.isolated_creds.get_primary_creds().tenant_id
+        cls.demo_tenant_id = cls.client.tenant_id
 
         cls.default_quota_set = set(('metadata_items',
                                      'ram', 'floating_ips',
diff --git a/tempest/api/compute/v3/admin/test_servers_negative.py b/tempest/api/compute/v3/admin/test_servers_negative.py
index fba4cd1..a46da47 100644
--- a/tempest/api/compute/v3/admin/test_servers_negative.py
+++ b/tempest/api/compute/v3/admin/test_servers_negative.py
@@ -37,10 +37,7 @@
         cls.client = cls.servers_admin_client
         cls.non_adm_client = cls.servers_client
         cls.flavors_client = cls.flavors_admin_client
-        cls.identity_client = cls._get_identity_admin_client()
-        tenant = cls.identity_client.get_tenant_by_name(
-            cls.client.tenant_name)
-        cls.tenant_id = tenant['id']
+        cls.tenant_id = cls.client.tenant_id
 
         cls.s1_name = data_utils.rand_name('server')
         resp, server = cls.create_test_server(name=cls.s1_name,
diff --git a/tempest/api/compute/v3/servers/test_server_metadata.py b/tempest/api/compute/v3/servers/test_server_metadata.py
index 0e4ef07..298cd3c 100644
--- a/tempest/api/compute/v3/servers/test_server_metadata.py
+++ b/tempest/api/compute/v3/servers/test_server_metadata.py
@@ -24,10 +24,7 @@
         super(ServerMetadataV3Test, cls).setUpClass()
         cls.client = cls.servers_client
         cls.quotas = cls.quotas_client
-        cls.admin_client = cls._get_identity_admin_client()
-        resp, tenants = cls.admin_client.list_tenants()
-        cls.tenant_id = [tnt['id'] for tnt in tenants if tnt['name'] ==
-                         cls.client.tenant_name][0]
+        cls.tenant_id = cls.client.tenant_id
         resp, server = cls.create_test_server(meta={}, wait_until='ACTIVE')
 
         cls.server_id = server['id']
diff --git a/tempest/api/compute/v3/servers/test_server_metadata_negative.py b/tempest/api/compute/v3/servers/test_server_metadata_negative.py
index ec2bc8c..f746be3 100644
--- a/tempest/api/compute/v3/servers/test_server_metadata_negative.py
+++ b/tempest/api/compute/v3/servers/test_server_metadata_negative.py
@@ -25,10 +25,7 @@
         super(ServerMetadataV3NegativeTest, cls).setUpClass()
         cls.client = cls.servers_client
         cls.quotas = cls.quotas_client
-        cls.admin_client = cls._get_identity_admin_client()
-        resp, tenants = cls.admin_client.list_tenants()
-        cls.tenant_id = [tnt['id'] for tnt in tenants if tnt['name'] ==
-                         cls.client.tenant_name][0]
+        cls.tenant_id = cls.client.tenant_id
         resp, server = cls.create_test_server(meta={}, wait_until='ACTIVE')
 
         cls.server_id = server['id']
diff --git a/tempest/api/compute/v3/test_quotas.py b/tempest/api/compute/v3/test_quotas.py
index 3fe62e9..62a7556 100644
--- a/tempest/api/compute/v3/test_quotas.py
+++ b/tempest/api/compute/v3/test_quotas.py
@@ -23,13 +23,8 @@
     def setUpClass(cls):
         super(QuotasV3Test, cls).setUpClass()
         cls.client = cls.quotas_client
-        cls.admin_client = cls._get_identity_admin_client()
-        resp, tenants = cls.admin_client.list_tenants()
-        cls.tenant_id = [tnt['id'] for tnt in tenants if tnt['name'] ==
-                         cls.client.tenant_name][0]
-        resp, users = cls.admin_client.list_users_for_tenant(cls.tenant_id)
-        cls.user_id = [user['id'] for user in users if user['name'] ==
-                       cls.client.user][0]
+        cls.tenant_id = cls.client.tenant_id
+        cls.user_id = cls.client.user_id
         cls.default_quota_set = set(('metadata_items',
                                      'ram', 'floating_ips',
                                      'fixed_ips', 'key_pairs',
diff --git a/tempest/api/image/base.py b/tempest/api/image/base.py
index 31ffd14..e31e635 100644
--- a/tempest/api/image/base.py
+++ b/tempest/api/image/base.py
@@ -93,14 +93,11 @@
         super(BaseV1ImageMembersTest, cls).setUpClass()
         if CONF.compute.allow_tenant_isolation:
             cls.os_alt = clients.Manager(cls.isolated_creds.get_alt_creds())
-            cls.alt_tenant_id = cls.isolated_creds.get_alt_tenant()['id']
         else:
             cls.os_alt = clients.AltManager()
-            identity_client = cls._get_identity_admin_client()
-            cls.alt_tenant_id = identity_client.get_tenant_by_name(
-                cls.os_alt.credentials['tenant_name'])['id']
 
         cls.alt_img_cli = cls.os_alt.image_client
+        cls.alt_tenant_id = cls.alt_img_cli.tenant_id
 
     def _create_image(self):
         image_file = StringIO.StringIO('*' * 1024)
diff --git a/tempest/api/object_storage/test_account_quotas.py b/tempest/api/object_storage/test_account_quotas.py
index 021555c..19e3068 100644
--- a/tempest/api/object_storage/test_account_quotas.py
+++ b/tempest/api/object_storage/test_account_quotas.py
@@ -47,15 +47,11 @@
             msg = "No ResellerAdmin role found"
             raise exceptions.NotFound(msg)
 
-        # Retrieve the ResellerAdmin tenant id
-        _, users = cls.os_admin.identity_client.get_users()
-        reseller_user_id = next(usr['id'] for usr in users if usr['name']
-                                == cls.data.test_user)
+        # Retrieve the ResellerAdmin user id
+        reseller_user_id = cls.data.test_credentials.user_id
 
         # Retrieve the ResellerAdmin tenant id
-        _, tenants = cls.os_admin.identity_client.list_tenants()
-        reseller_tenant_id = next(tnt['id'] for tnt in tenants if tnt['name']
-                                  == cls.data.test_tenant)
+        reseller_tenant_id = cls.data.test_credentials.tenant_id
 
         # Assign the newly created user the appropriate ResellerAdmin role
         cls.os_admin.identity_client.assign_user_role(
diff --git a/tempest/api/object_storage/test_account_quotas_negative.py b/tempest/api/object_storage/test_account_quotas_negative.py
index f1355db..6afd381 100644
--- a/tempest/api/object_storage/test_account_quotas_negative.py
+++ b/tempest/api/object_storage/test_account_quotas_negative.py
@@ -48,14 +48,10 @@
             raise exceptions.NotFound(msg)
 
         # Retrieve the ResellerAdmin tenant id
-        _, users = cls.os_admin.identity_client.get_users()
-        reseller_user_id = next(usr['id'] for usr in users if usr['name']
-                                == cls.data.test_user)
+        reseller_user_id = cls.data.test_credentials.user_id
 
         # Retrieve the ResellerAdmin tenant id
-        _, tenants = cls.os_admin.identity_client.list_tenants()
-        reseller_tenant_id = next(tnt['id'] for tnt in tenants if tnt['name']
-                                  == cls.data.test_tenant)
+        reseller_tenant_id = cls.data.test_credentials.tenant_id
 
         # Assign the newly created user the appropriate ResellerAdmin role
         cls.os_admin.identity_client.assign_user_role(
diff --git a/tempest/api/volume/admin/test_volume_quotas_negative.py b/tempest/api/volume/admin/test_volume_quotas_negative.py
index 292f8ed..ab88b90 100644
--- a/tempest/api/volume/admin/test_volume_quotas_negative.py
+++ b/tempest/api/volume/admin/test_volume_quotas_negative.py
@@ -26,8 +26,8 @@
     @test.safe_setup
     def setUpClass(cls):
         super(VolumeQuotasNegativeTestJSON, cls).setUpClass()
-        demo_user = cls.isolated_creds.get_primary_user()
-        cls.demo_tenant_id = demo_user.get('tenantId')
+        demo_user = cls.isolated_creds.get_primary_creds()
+        cls.demo_tenant_id = demo_user.tenant_id
         cls.shared_quota_set = {'gigabytes': 3, 'volumes': 1, 'snapshots': 1}
 
         # NOTE(gfidente): no need to restore original quota set
diff --git a/tempest/api/volume/test_volume_transfers.py b/tempest/api/volume/test_volume_transfers.py
index 1ef93b9..82d1364 100644
--- a/tempest/api/volume/test_volume_transfers.py
+++ b/tempest/api/volume/test_volume_transfers.py
@@ -34,22 +34,16 @@
         if CONF.compute.allow_tenant_isolation:
             cls.os_alt = clients.Manager(cls.isolated_creds.get_alt_creds(),
                                          interface=cls._interface)
-            cls.alt_tenant_id = cls.isolated_creds.get_alt_tenant()['id']
             # Add admin tenant to cleanup resources
             cls.os_adm = clients.Manager(cls.isolated_creds.get_admin_creds(),
                                          interface=cls._interface)
-
         else:
             cls.os_alt = clients.AltManager()
-            alt_tenant_name = cls.os_alt.credentials['tenant_name']
-            identity_client = cls._get_identity_admin_client()
-            _, tenants = identity_client.list_tenants()
-            cls.alt_tenant_id = [tnt['id'] for tnt in tenants
-                                 if tnt['name'] == alt_tenant_name][0]
             cls.os_adm = clients.ComputeAdminManager(interface=cls._interface)
 
         cls.client = cls.volumes_client
         cls.alt_client = cls.os_alt.volumes_client
+        cls.alt_tenant_id = cls.alt_client.tenant_id
         cls.adm_client = cls.os_adm.volumes_client
 
     def _delete_volume(self, volume_id):
diff --git a/tempest/common/isolated_creds.py b/tempest/common/isolated_creds.py
index 5059a5b..b4618ed 100644
--- a/tempest/common/isolated_creds.py
+++ b/tempest/common/isolated_creds.py
@@ -31,7 +31,6 @@
                  password='pass', network_resources=None):
         self.network_resources = network_resources
         self.isolated_creds = {}
-        self.isolated_creds_old_style = {}
         self.isolated_net_resources = {}
         self.ports = []
         self.name = name
@@ -166,7 +165,7 @@
                 self._assign_user_role(tenant['id'], user['id'], role['id'])
             else:
                 self._assign_user_role(tenant.id, user.id, role.id)
-        return self._get_credentials(user, tenant), user, tenant
+        return self._get_credentials(user, tenant)
 
     def _get_credentials(self, user, tenant):
         if self.tempest_client:
@@ -292,30 +291,6 @@
             body = {'subnet_id': subnet_id}
             self.network_admin_client.add_interface_router(router_id, body)
 
-    def get_primary_tenant(self):
-        # Deprecated. Maintained until all tests are ported
-        return self.isolated_creds_old_style.get('primary')[1]
-
-    def get_primary_user(self):
-        # Deprecated. Maintained until all tests are ported
-        return self.isolated_creds_old_style.get('primary')[0]
-
-    def get_alt_tenant(self):
-        # Deprecated. Maintained until all tests are ported
-        return self.isolated_creds_old_style.get('alt')[1]
-
-    def get_alt_user(self):
-        # Deprecated. Maintained until all tests are ported
-        return self.isolated_creds_old_style.get('alt')[0]
-
-    def get_admin_tenant(self):
-        # Deprecated. Maintained until all tests are ported
-        return self.isolated_creds_old_style.get('admin')[1]
-
-    def get_admin_user(self):
-        # Deprecated. Maintained until all tests are ported
-        return self.isolated_creds_old_style.get('admin')[0]
-
     def get_primary_network(self):
         return self.isolated_net_resources.get('primary')[0]
 
@@ -343,15 +318,14 @@
     def get_alt_router(self):
         return self.isolated_net_resources.get('alt')[2]
 
-    def get_credentials(self, credential_type, old_style):
+    def get_credentials(self, credential_type):
         if self.isolated_creds.get(credential_type):
             credentials = self.isolated_creds[credential_type]
         else:
             is_admin = (credential_type == 'admin')
-            credentials, user, tenant = self._create_creds(admin=is_admin)
+            credentials = self._create_creds(admin=is_admin)
             self.isolated_creds[credential_type] = credentials
             # Maintained until tests are ported
-            self.isolated_creds_old_style[credential_type] = (user, tenant)
             LOG.info("Acquired isolated creds:\n credentials: %s"
                      % credentials)
             if CONF.service_available.neutron:
@@ -361,20 +335,16 @@
                     network, subnet, router,)
                 LOG.info("Created isolated network resources for : \n"
                          + " credentials: %s" % credentials)
-        if old_style:
-            return (credentials.username, credentials.tenant_name,
-                    credentials.password)
-        else:
-            return credentials
+        return credentials
 
-    def get_primary_creds(self, old_style=False):
-        return self.get_credentials('primary', old_style)
+    def get_primary_creds(self):
+        return self.get_credentials('primary')
 
-    def get_admin_creds(self, old_style=False):
-        return self.get_credentials('admin', old_style)
+    def get_admin_creds(self):
+        return self.get_credentials('admin')
 
-    def get_alt_creds(self, old_style=False):
-        return self.get_credentials('alt', old_style)
+    def get_alt_creds(self):
+        return self.get_credentials('alt')
 
     def _clear_isolated_router(self, router_id, router_name):
         net_client = self.network_admin_client
diff --git a/tempest/common/rest_client.py b/tempest/common/rest_client.py
index 02a8c65..10223a0 100644
--- a/tempest/common/rest_client.py
+++ b/tempest/common/rest_client.py
@@ -143,6 +143,10 @@
         return self.auth_provider.credentials.username
 
     @property
+    def user_id(self):
+        return self.auth_provider.credentials.user_id
+
+    @property
     def tenant_name(self):
         return self.auth_provider.credentials.tenant_name
 
diff --git a/tempest/tests/test_tenant_isolation.py b/tempest/tests/test_tenant_isolation.py
index 98a896f..9292dcb 100644
--- a/tempest/tests/test_tenant_isolation.py
+++ b/tempest/tests/test_tenant_isolation.py
@@ -121,14 +121,12 @@
                                                  password='fake_password')
         self._mock_tenant_create('1234', 'fake_prim_tenant')
         self._mock_user_create('1234', 'fake_prim_user')
-        primary_creds = iso_creds.get_primary_creds(old_style=False)
+        primary_creds = iso_creds.get_primary_creds()
         self.assertEqual(primary_creds.username, 'fake_prim_user')
         self.assertEqual(primary_creds.tenant_name, 'fake_prim_tenant')
-        # Verify helper methods
-        tenant = iso_creds.get_primary_tenant()
-        user = iso_creds.get_primary_user()
-        self.assertEqual(tenant['id'], '1234')
-        self.assertEqual(user['id'], '1234')
+        # Verify IDs
+        self.assertEqual(primary_creds.tenant_id, '1234')
+        self.assertEqual(primary_creds.user_id, '1234')
 
     @patch('tempest.common.rest_client.RestClient')
     def test_admin_creds(self, MockRestClient):
@@ -153,11 +151,9 @@
         user_mock.assert_called_once_with('1234', '1234', '1234')
         self.assertEqual(admin_creds.username, 'fake_admin_user')
         self.assertEqual(admin_creds.tenant_name, 'fake_admin_tenant')
-        # Verify helper methods
-        tenant = iso_creds.get_admin_tenant()
-        user = iso_creds.get_admin_user()
-        self.assertEqual(tenant['id'], '1234')
-        self.assertEqual(user['id'], '1234')
+        # Verify IDs
+        self.assertEqual(admin_creds.tenant_id, '1234')
+        self.assertEqual(admin_creds.user_id, '1234')
 
     @patch('tempest.common.rest_client.RestClient')
     def test_all_cred_cleanup(self, MockRestClient):
@@ -166,12 +162,12 @@
                                                  password='fake_password')
         tenant_fix = self._mock_tenant_create('1234', 'fake_prim_tenant')
         user_fix = self._mock_user_create('1234', 'fake_prim_user')
-        iso_creds.get_primary_creds(old_style=False)
+        iso_creds.get_primary_creds()
         tenant_fix.cleanUp()
         user_fix.cleanUp()
         tenant_fix = self._mock_tenant_create('12345', 'fake_alt_tenant')
         user_fix = self._mock_user_create('12345', 'fake_alt_user')
-        iso_creds.get_alt_creds(old_style=False)
+        iso_creds.get_alt_creds()
         tenant_fix.cleanUp()
         user_fix.cleanUp()
         tenant_fix = self._mock_tenant_create('123456', 'fake_admin_tenant')
@@ -213,14 +209,12 @@
                                                  password='fake_password')
         self._mock_user_create('1234', 'fake_alt_user')
         self._mock_tenant_create('1234', 'fake_alt_tenant')
-        alt_creds = iso_creds.get_alt_creds(old_style=False)
+        alt_creds = iso_creds.get_alt_creds()
         self.assertEqual(alt_creds.username, 'fake_alt_user')
         self.assertEqual(alt_creds.tenant_name, 'fake_alt_tenant')
-        # Verify helper methods
-        tenant = iso_creds.get_alt_tenant()
-        user = iso_creds.get_alt_user()
-        self.assertEqual(tenant['id'], '1234')
-        self.assertEqual(user['id'], '1234')
+        # Verify IDs
+        self.assertEqual(alt_creds.tenant_id, '1234')
+        self.assertEqual(alt_creds.user_id, '1234')
 
     @patch('tempest.common.rest_client.RestClient')
     def test_network_creation(self, MockRestClient):
@@ -234,7 +228,7 @@
         router_interface_mock = self.patch(
             'tempest.services.network.json.network_client.NetworkClientJSON.'
             'add_router_interface_with_subnet_id')
-        iso_creds.get_primary_creds(old_style=False)
+        iso_creds.get_primary_creds()
         router_interface_mock.called_once_with('1234', '1234')
         network = iso_creds.get_primary_network()
         subnet = iso_creds.get_primary_subnet()
@@ -259,7 +253,7 @@
         router_interface_mock = self.patch(
             'tempest.services.network.json.network_client.NetworkClientJSON.'
             'add_router_interface_with_subnet_id')
-        iso_creds.get_primary_creds(old_style=False)
+        iso_creds.get_primary_creds()
         router_interface_mock.called_once_with('1234', '1234')
         router_interface_mock.reset_mock()
         tenant_fix.cleanUp()
@@ -274,7 +268,7 @@
         subnet_fix = self._mock_subnet_create(iso_creds, '12345',
                                               'fake_alt_subnet')
         router_fix = self._mock_router_create('12345', 'fake_alt_router')
-        iso_creds.get_alt_creds(old_style=False)
+        iso_creds.get_alt_creds()
         router_interface_mock.called_once_with('12345', '12345')
         router_interface_mock.reset_mock()
         tenant_fix.cleanUp()