diff --git a/tempest/api/identity/admin/v3/test_list_users.py b/tempest/api/identity/admin/v3/test_list_users.py
index ca91ce5..4921c00 100644
--- a/tempest/api/identity/admin/v3/test_list_users.py
+++ b/tempest/api/identity/admin/v3/test_list_users.py
@@ -42,13 +42,13 @@
         cls.domain_enabled_user = cls.client.create_user(
             u1_name, password=alt_password,
             email=cls.alt_email, domain_id=cls.data.domain['id'])['user']
-        cls.data.v3_users.append(cls.domain_enabled_user)
+        cls.data.users.append(cls.domain_enabled_user)
         # Create default not enabled user
         u2_name = data_utils.rand_name('test_user')
         cls.non_domain_enabled_user = cls.client.create_user(
             u2_name, password=alt_password,
             email=cls.alt_email, enabled=False)['user']
-        cls.data.v3_users.append(cls.non_domain_enabled_user)
+        cls.data.users.append(cls.non_domain_enabled_user)
 
     @test.idempotent_id('08f9aabb-dcfe-41d0-8172-82b5fa0bd73d')
     def test_list_user_domains(self):
@@ -79,7 +79,7 @@
         # List users
         body = self.client.list_users()['users']
         fetched_ids = [u['id'] for u in body]
-        missing_users = [u['id'] for u in self.data.v3_users
+        missing_users = [u['id'] for u in self.data.users
                          if u['id'] not in fetched_ids]
         self.assertEqual(0, len(missing_users),
                          "Failed to find user %s in fetched list" %
@@ -88,8 +88,8 @@
     @test.idempotent_id('b4baa3ae-ac00-4b4e-9e27-80deaad7771f')
     def test_get_user(self):
         # Get a user detail
-        user = self.client.show_user(self.data.v3_users[0]['id'])['user']
-        self.assertEqual(self.data.v3_users[0]['id'], user['id'])
-        self.assertEqual(self.data.v3_users[0]['name'], user['name'])
+        user = self.client.show_user(self.data.users[0]['id'])['user']
+        self.assertEqual(self.data.users[0]['id'], user['id'])
+        self.assertEqual(self.data.users[0]['name'], user['name'])
         self.assertEqual(self.alt_email, user['email'])
         self.assertEqual(self.data.domain['id'], user['domain_id'])
diff --git a/tempest/api/identity/admin/v3/test_roles.py b/tempest/api/identity/admin/v3/test_roles.py
index ae714aa..1c97f16 100644
--- a/tempest/api/identity/admin/v3/test_roles.py
+++ b/tempest/api/identity/admin/v3/test_roles.py
@@ -26,7 +26,7 @@
         for _ in range(3):
             role_name = data_utils.rand_name(name='role')
             role = cls.client.create_role(name=role_name)['role']
-            cls.data.v3_roles.append(role)
+            cls.data.roles.append(role)
         cls.fetched_role_ids = list()
         u_name = data_utils.rand_name('user')
         u_desc = '%s description' % u_name
@@ -175,5 +175,5 @@
     def test_list_roles(self):
         # Return a list of all roles
         body = self.client.list_roles()['roles']
-        found = [role for role in body if role in self.data.v3_roles]
-        self.assertEqual(len(found), len(self.data.v3_roles))
+        found = [role for role in body if role in self.data.roles]
+        self.assertEqual(len(found), len(self.data.roles))
diff --git a/tempest/api/identity/admin/v3/test_users.py b/tempest/api/identity/admin/v3/test_users.py
index a402b3f..894a7a9 100644
--- a/tempest/api/identity/admin/v3/test_users.py
+++ b/tempest/api/identity/admin/v3/test_users.py
@@ -151,6 +151,6 @@
     @test.idempotent_id('c10dcd90-461d-4b16-8e23-4eb836c00644')
     def test_get_user(self):
         # Get a user detail
-        self.data.setup_test_v3_user()
-        user = self.client.show_user(self.data.v3_user['id'])['user']
-        self.assertEqual(self.data.v3_user['id'], user['id'])
+        self.data.setup_test_user()
+        user = self.client.show_user(self.data.user['id'])['user']
+        self.assertEqual(self.data.user['id'], user['id'])
diff --git a/tempest/api/identity/admin/v3/test_users_negative.py b/tempest/api/identity/admin/v3/test_users_negative.py
index 4c80bda..b2fb6e0 100644
--- a/tempest/api/identity/admin/v3/test_users_negative.py
+++ b/tempest/api/identity/admin/v3/test_users_negative.py
@@ -38,7 +38,7 @@
     @test.idempotent_id('b3c9fccc-4134-46f5-b600-1da6fb0a3b1f')
     def test_authentication_for_disabled_user(self):
         # Attempt to authenticate for disabled user should fail
-        self.data.setup_test_v3_user()
+        self.data.setup_test_user()
         self.disable_user(self.data.test_user)
         self.assertRaises(lib_exc.Unauthorized, self.token.auth,
                           username=self.data.test_user,
diff --git a/tempest/api/identity/base.py b/tempest/api/identity/base.py
index e317ed0..028e9f2 100644
--- a/tempest/api/identity/base.py
+++ b/tempest/api/identity/base.py
@@ -16,7 +16,6 @@
 from oslo_log import log as logging
 from tempest_lib import exceptions as lib_exc
 
-from tempest.common import credentials_factory as common_creds
 from tempest.common.utils import data_utils
 from tempest import config
 import tempest.test
@@ -109,8 +108,8 @@
     @classmethod
     def resource_setup(cls):
         super(BaseIdentityV2AdminTest, cls).resource_setup()
-        cls.data = DataGenerator(cls.client, cls.tenants_client,
-                                 cls.roles_client, cls.users_client)
+        cls.data = DataGeneratorV2(cls.client, cls.tenants_client,
+                                   cls.users_client, cls.roles_client)
 
     @classmethod
     def resource_cleanup(cls):
@@ -153,7 +152,10 @@
         cls.creds_client = cls.os_adm.credentials_client
         cls.groups_client = cls.os_adm.groups_client
 
-        cls.data = DataGenerator(cls.client)
+    @classmethod
+    def resource_setup(cls):
+        super(BaseIdentityV3AdminTest, cls).resource_setup()
+        cls.data = DataGeneratorV3(cls.client)
 
     @classmethod
     def resource_cleanup(cls):
@@ -193,127 +195,107 @@
         self.client.delete_domain(domain_id)
 
 
-class DataGenerator(object):
+class BaseDataGenerator(object):
 
-        def __init__(self, client, tenants_client=None, roles_client=None,
-                     users_client=None):
-            self.client = client
-            # TODO(dmellado) split Datagenerator for v2 and v3
-            self.tenants_client = tenants_client
-            self.roles_client = roles_client
-            self.users_client = users_client
-            self.users = []
-            self.tenants = []
-            self.roles = []
-            self.role_name = None
-            self.v3_users = []
-            self.projects = []
-            self.v3_roles = []
-            self.domains = []
+    def __init__(self, client, projects_client=None,
+                 users_client=None, roles_client=None):
+        self.client = client
+        self.projects_client = projects_client or client
+        self.users_client = users_client or client
+        self.roles_client = roles_client or client
 
-        @property
-        def test_credentials(self):
-            return common_creds.get_credentials(username=self.test_user,
-                                                user_id=self.user['id'],
-                                                password=self.test_password,
-                                                tenant_name=self.test_tenant,
-                                                tenant_id=self.tenant['id'])
+        self.test_user = ''
+        self.test_password = ''
+        self.test_tenant = ''
+        self.test_project = ''
+        self.test_role = ''
+        self.test_email = ''
 
-        def setup_test_user(self):
-            """Set up a test user."""
-            self.setup_test_tenant()
-            self.test_user = data_utils.rand_name('test_user')
-            self.test_password = data_utils.rand_password()
-            self.test_email = self.test_user + '@testmail.tm'
-            self.user = self.users_client.create_user(self.test_user,
-                                                      self.test_password,
-                                                      self.tenant['id'],
-                                                      self.test_email)['user']
-            self.users.append(self.user)
+        self.user = None
+        self.tenant = None
+        self.project = None
+        self.role = None
+        self.domain = None
 
-        def setup_test_tenant(self):
-            """Set up a test tenant."""
-            self.test_tenant = data_utils.rand_name('test_tenant')
-            self.test_description = data_utils.rand_name('desc')
-            self.tenant = self.tenants_client.create_tenant(
-                name=self.test_tenant,
-                description=self.test_description)['tenant']
-            self.tenants.append(self.tenant)
+        self.users = []
+        self.tenants = []
+        self.projects = []
+        self.roles = []
+        self.domains = []
 
-        def setup_test_role(self):
-            """Set up a test role."""
-            self.test_role = data_utils.rand_name('role')
-            self.role = self.roles_client.create_role(
-                name=self.test_role)['role']
-            self.roles.append(self.role)
+    def _create_test_user(self, **kwargs):
+        self.test_user = data_utils.rand_name('test_user')
+        self.test_password = data_utils.rand_password()
+        self.test_email = self.test_user + '@testmail.tm'
+        self.user = self.users_client.create_user(
+            self.test_user, password=self.test_password,
+            email=self.test_email, **kwargs)['user']
+        self.users.append(self.user)
 
-        def setup_test_v3_user(self):
-            """Set up a test v3 user."""
-            self.setup_test_project()
-            self.test_user = data_utils.rand_name('test_user')
-            self.test_password = data_utils.rand_password()
-            self.test_email = self.test_user + '@testmail.tm'
-            self.v3_user = self.client.create_user(
-                self.test_user,
-                password=self.test_password,
-                project_id=self.project['id'],
-                email=self.test_email)['user']
-            self.v3_users.append(self.v3_user)
+    def setup_test_role(self):
+        """Set up a test role."""
+        self.test_role = data_utils.rand_name('role')
+        self.role = self.roles_client.create_role(name=self.test_role)['role']
+        self.roles.append(self.role)
 
-        def setup_test_project(self):
-            """Set up a test project."""
-            self.test_project = data_utils.rand_name('test_project')
-            self.test_description = data_utils.rand_name('desc')
-            self.project = self.client.create_project(
-                name=self.test_project,
-                description=self.test_description)['project']
-            self.projects.append(self.project)
+    @staticmethod
+    def _try_wrapper(func, item, **kwargs):
+        try:
+            func(item['id'], **kwargs)
+        except lib_exc.NotFound:
+            pass
+        except Exception:
+            LOG.exception("Unexpected exception occurred in %s deletion. "
+                          "But ignored here." % item['id'])
 
-        def setup_test_v3_role(self):
-            """Set up a test v3 role."""
-            self.test_role = data_utils.rand_name('role')
-            self.v3_role = self.client.create_role(name=self.test_role)['role']
-            self.v3_roles.append(self.v3_role)
+    def teardown_all(self):
+        for user in self.users:
+            self._try_wrapper(self.users_client.delete_user, user)
+        for tenant in self.tenants:
+            self._try_wrapper(self.projects_client.delete_tenant, tenant)
+        for project in self.projects:
+            self._try_wrapper(self.projects_client.delete_project, project)
+        for role in self.roles:
+            self._try_wrapper(self.roles_client.delete_role, role)
+        for domain in self.domains:
+            self._try_wrapper(self.client.update_domain, domain, enabled=False)
+            self._try_wrapper(self.client.delete_domain, domain)
 
-        def setup_test_domain(self):
-            """Set up a test domain."""
-            self.test_domain = data_utils.rand_name('test_domain')
-            self.test_description = data_utils.rand_name('desc')
-            self.domain = self.client.create_domain(
-                name=self.test_domain,
-                description=self.test_description)['domain']
-            self.domains.append(self.domain)
 
-        @staticmethod
-        def _try_wrapper(func, item, **kwargs):
-            try:
-                if kwargs:
-                    func(item['id'], **kwargs)
-                else:
-                    func(item['id'])
-            except lib_exc.NotFound:
-                pass
-            except Exception:
-                LOG.exception("Unexpected exception occurred in %s deletion."
-                              " But ignored here." % item['id'])
+class DataGeneratorV2(BaseDataGenerator):
 
-        def teardown_all(self):
-            # NOTE(masayukig): v3 client doesn't have v2 method.
-            # (e.g. delete_tenant) So we need to check resources existence
-            # before using client methods.
-            for user in self.users:
-                self._try_wrapper(self.users_client.delete_user, user)
-            for tenant in self.tenants:
-                self._try_wrapper(self.tenants_client.delete_tenant, tenant)
-            for role in self.roles:
-                self._try_wrapper(self.roles_client.delete_role, role)
-            for v3_user in self.v3_users:
-                self._try_wrapper(self.client.delete_user, v3_user)
-            for v3_project in self.projects:
-                self._try_wrapper(self.client.delete_project, v3_project)
-            for v3_role in self.v3_roles:
-                self._try_wrapper(self.client.delete_role, v3_role)
-            for domain in self.domains:
-                self._try_wrapper(self.client.update_domain, domain,
-                                  enabled=False)
-                self._try_wrapper(self.client.delete_domain, domain)
+    def setup_test_user(self):
+        """Set up a test user."""
+        self.setup_test_tenant()
+        self._create_test_user(tenant_id=self.tenant['id'])
+
+    def setup_test_tenant(self):
+        """Set up a test tenant."""
+        self.test_tenant = data_utils.rand_name('test_tenant')
+        self.tenant = self.projects_client.create_tenant(
+            name=self.test_tenant,
+            description=data_utils.rand_name('desc'))['tenant']
+        self.tenants.append(self.tenant)
+
+
+class DataGeneratorV3(BaseDataGenerator):
+
+    def setup_test_user(self):
+        """Set up a test user."""
+        self.setup_test_project()
+        self._create_test_user(project_id=self.project['id'])
+
+    def setup_test_project(self):
+        """Set up a test project."""
+        self.test_project = data_utils.rand_name('test_project')
+        self.project = self.projects_client.create_project(
+            name=self.test_project,
+            description=data_utils.rand_name('desc'))['project']
+        self.projects.append(self.project)
+
+    def setup_test_domain(self):
+        """Set up a test domain."""
+        self.domain = self.client.create_domain(
+            name=data_utils.rand_name('test_domain'),
+            description=data_utils.rand_name('desc'))['domain']
+        self.domains.append(self.domain)