diff --git a/tempest/clients.py b/tempest/clients.py
index 7d314f3..ef07d9c 100644
--- a/tempest/clients.py
+++ b/tempest/clients.py
@@ -25,6 +25,7 @@
 from tempest.services.compute.json.flavors_client import FlavorsClientJSON
 from tempest.services.compute.json.floating_ips_client import \
     FloatingIPsClientJSON
+from tempest.services.compute.json.hosts_client import HostsClientJSON
 from tempest.services.compute.json.images_client import ImagesClientJSON
 from tempest.services.compute.json.keypairs_client import KeyPairsClientJSON
 from tempest.services.compute.json.limits_client import LimitsClientJSON
@@ -211,6 +212,7 @@
             msg = "Unsupported interface type `%s'" % interface
             raise exceptions.InvalidConfiguration(msg)
         self.network_client = NetworkClient(*client_args)
+        self.hosts_client = HostsClientJSON(*client_args)
         self.account_client = AccountClient(*client_args)
         self.image_client = ImageClientJSON(*client_args)
         self.container_client = ContainerClient(*client_args)
diff --git a/tempest/tests/compute/servers/test_server_metadata.py b/tempest/tests/compute/servers/test_server_metadata.py
index 7896466..cdfe2f1 100644
--- a/tempest/tests/compute/servers/test_server_metadata.py
+++ b/tempest/tests/compute/servers/test_server_metadata.py
@@ -233,3 +233,12 @@
         self.assertRaises(exceptions.OverLimit,
                           self.client.update_server_metadata,
                           self.server_id, req_metadata)
+
+    @attr(type='negative')
+    def test_update_all_metadata_field_error(self):
+        # Raise a bad request error for blank key.
+        # set_server_metadata will replace all metadata with new value
+        meta = {'': 'data1'}
+        self.assertRaises(exceptions.BadRequest,
+                          self.client.set_server_metadata,
+                          self.server_id, meta=meta)
diff --git a/tempest/tests/compute/test_live_block_migration.py b/tempest/tests/compute/test_live_block_migration.py
index 078026a..dcd6a78 100644
--- a/tempest/tests/compute/test_live_block_migration.py
+++ b/tempest/tests/compute/test_live_block_migration.py
@@ -22,14 +22,12 @@
 
 from tempest import config
 from tempest import exceptions
-from tempest.services.compute.json.hosts_client import HostsClientJSON
-from tempest.services.compute.json.servers_client import ServersClientJSON
 from tempest.test import attr
 from tempest.tests.compute import base
 
 
 @attr(category='live-migration')
-class LiveBlockMigrationTest(base.BaseComputeTest):
+class LiveBlockMigrationTest(base.BaseComputeAdminTest):
     _interface = 'json'
 
     live_migration_available = (
@@ -42,12 +40,8 @@
     def setUpClass(cls):
         super(LiveBlockMigrationTest, cls).setUpClass()
 
-        tenant_name = cls.config.compute_admin.tenant_name
-        cls.admin_hosts_client = HostsClientJSON(
-            *cls._get_client_args(), tenant_name=tenant_name)
-
-        cls.admin_servers_client = ServersClientJSON(
-            *cls._get_client_args(), tenant_name=tenant_name)
+        cls.admin_hosts_client = cls.os_adm.hosts_client
+        cls.admin_servers_client = cls.os_adm.servers_client
 
         cls.created_server_ids = []
 
@@ -102,7 +96,7 @@
     @attr(type='positive')
     @testtools.skipIf(not live_migration_available,
                       'Block Live migration not available')
-    def test_001_live_block_migration(self):
+    def test_live_block_migration(self):
         # Live block migrate an instance to another host
         if len(self._get_compute_hostnames()) < 2:
             raise self.skipTest(
@@ -114,11 +108,10 @@
         self.servers_client.wait_for_server_status(server_id, 'ACTIVE')
         self.assertEquals(target_host, self._get_host_for_server(server_id))
 
-    @attr(type='positive', bug='lp1051881')
     @testtools.skip('Until bug 1051881 is dealt with.')
     @testtools.skipIf(not live_migration_available,
                       'Block Live migration not available')
-    def test_002_invalid_host_for_migration(self):
+    def test_invalid_host_for_migration(self):
         # Migrating to an invalid host should not change the status
 
         server_id = self._get_an_active_server()
diff --git a/tempest/tests/identity/admin/test_roles.py b/tempest/tests/identity/admin/test_roles.py
index 46db4fb..53c5b0d 100644
--- a/tempest/tests/identity/admin/test_roles.py
+++ b/tempest/tests/identity/admin/test_roles.py
@@ -20,11 +20,12 @@
 from tempest.tests.identity import base
 
 
-class RolesTestBase(object):
+class RolesTestJSON(base.BaseIdentityAdminTest):
+    _interface = 'json'
 
-    @staticmethod
+    @classmethod
     def setUpClass(cls):
-
+        super(RolesTestJSON, cls).setUpClass()
         for _ in xrange(5):
             resp, role = cls.client.create_role(rand_name('role-'))
             cls.data.roles.append(role)
@@ -37,6 +38,13 @@
         role = self.get_role_by_name(self.data.test_role)
         return (user, tenant, role)
 
+    def assert_role_in_role_list(self, role, roles):
+        found = False
+        for user_role in roles:
+            if user_role['id'] == role['id']:
+                found = True
+        self.assertTrue(found, "assigned role was not in list")
+
     def test_list_roles(self):
         # Return a list of all roles
         resp, body = self.client.list_roles()
@@ -97,34 +105,6 @@
             pass
         self.client.delete_role(role1_id)
 
-
-class RolesTestJSON(base.BaseIdentityAdminTestJSON,
-                    RolesTestBase):
-
-    @classmethod
-    def setUpClass(cls):
-        super(RolesTestJSON, cls).setUpClass()
-        RolesTestBase.setUpClass(cls)
-
-
-class RolesTestXML(base.BaseIdentityAdminTestXML,
-                   RolesTestBase):
-
-    @classmethod
-    def setUpClass(cls):
-        super(RolesTestXML, cls).setUpClass()
-        RolesTestBase.setUpClass(cls)
-
-
-class UserRolesTestBase(RolesTestBase):
-
-    def assert_role_in_role_list(self, role, roles):
-        found = False
-        for user_role in roles:
-            if user_role['id'] == role['id']:
-                found = True
-        self.assertTrue(found, "assigned role was not in list")
-
     def test_assign_user_role(self):
         # Assign a role to a user on a tenant
         (user, tenant, role) = self._get_role_params()
@@ -267,17 +247,5 @@
                           tenant['id'], 'junk-role-aabbcc11')
 
 
-class UserRolesTestJSON(RolesTestJSON,
-                        UserRolesTestBase):
-
-    @classmethod
-    def setUpClass(cls):
-        super(UserRolesTestJSON, cls).setUpClass()
-
-
-class UserRolesTestXML(RolesTestXML,
-                       UserRolesTestBase):
-
-    @classmethod
-    def setUpClass(cls):
-        super(UserRolesTestXML, cls).setUpClass()
+class RolesTestXML(RolesTestJSON):
+    _interface = 'xml'
diff --git a/tempest/tests/identity/admin/test_services.py b/tempest/tests/identity/admin/test_services.py
index 77c8e83..caf57bd 100644
--- a/tempest/tests/identity/admin/test_services.py
+++ b/tempest/tests/identity/admin/test_services.py
@@ -21,7 +21,8 @@
 from tempest.tests.identity import base
 
 
-class ServicesTestBase(object):
+class ServicesTestJSON(base.BaseIdentityAdminTest):
+    _interface = 'json'
 
     def test_create_get_delete_service(self):
         # GET Service
@@ -91,14 +92,5 @@
         self.assertFalse(any(found), 'Services failed to delete')
 
 
-class ServicesTestJSON(base.BaseIdentityAdminTestJSON, ServicesTestBase):
-    @classmethod
-    def setUpClass(cls):
-        super(ServicesTestJSON, cls).setUpClass()
-
-
-class ServicesTestXML(base.BaseIdentityAdminTestXML,
-                      ServicesTestBase):
-    @classmethod
-    def setUpClass(cls):
-        super(ServicesTestXML, cls).setUpClass()
+class ServicesTestXML(ServicesTestJSON):
+    _interface = 'xml'
diff --git a/tempest/tests/identity/admin/test_tenants.py b/tempest/tests/identity/admin/test_tenants.py
index 6385cec..a3c9246 100644
--- a/tempest/tests/identity/admin/test_tenants.py
+++ b/tempest/tests/identity/admin/test_tenants.py
@@ -21,7 +21,8 @@
 from tempest.tests.identity import base
 
 
-class TenantsTestBase(object):
+class TenantsTestJSON(base.BaseIdentityAdminTest):
+    _interface = 'json'
 
     def test_list_tenants_by_unauthorized_user(self):
         # Non-admin user should not be able to list tenants
@@ -272,16 +273,5 @@
         self.data.tenants.remove(tenant)
 
 
-class TenantsTestJSON(base.BaseIdentityAdminTestJSON,
-                      TenantsTestBase):
-
-    @classmethod
-    def setUpClass(cls):
-        super(TenantsTestJSON, cls).setUpClass()
-
-
-class TenantsTestXML(base.BaseIdentityAdminTestXML, TenantsTestBase):
-
-    @classmethod
-    def setUpClass(cls):
-        super(TenantsTestXML, cls).setUpClass()
+class TenantsTestXML(TenantsTestJSON):
+    _interface = 'xml'
diff --git a/tempest/tests/identity/admin/test_users.py b/tempest/tests/identity/admin/test_users.py
index 67b2517..224272e 100644
--- a/tempest/tests/identity/admin/test_users.py
+++ b/tempest/tests/identity/admin/test_users.py
@@ -23,7 +23,8 @@
 from testtools.matchers._basic import Contains
 
 
-class UsersTestBase(object):
+class UsersTestJSON(base.BaseIdentityAdminTest):
+    _interface = 'json'
 
     alt_user = rand_name('test_user_')
     alt_password = rand_name('pass_')
@@ -338,14 +339,5 @@
                       'tenant ids %s' % fail)
 
 
-class UsersTestJSON(base.BaseIdentityAdminTestJSON,
-                    UsersTestBase):
-    @classmethod
-    def setUpClass(cls):
-        super(UsersTestJSON, cls).setUpClass()
-
-
-class UsersTestXML(base.BaseIdentityAdminTestXML, UsersTestBase):
-    @classmethod
-    def setUpClass(cls):
-        super(UsersTestXML, cls).setUpClass()
+class UsersTestXML(UsersTestJSON):
+    _interface = 'xml'
diff --git a/tempest/tests/identity/base.py b/tempest/tests/identity/base.py
index 2c4162c..168b2ff 100644
--- a/tempest/tests/identity/base.py
+++ b/tempest/tests/identity/base.py
@@ -21,7 +21,7 @@
 import tempest.test
 
 
-class BaseIdAdminTest(tempest.test.BaseTestCase):
+class BaseIdentityAdminTest(tempest.test.BaseTestCase):
 
     @classmethod
     def setUpClass(cls):
@@ -68,22 +68,6 @@
             return role[0]
 
 
-class BaseIdentityAdminTestJSON(BaseIdAdminTest):
-    @classmethod
-    def setUpClass(cls):
-        cls._interface = "json"
-        super(BaseIdentityAdminTestJSON, cls).setUpClass()
-
-BaseIdentityAdminTest = BaseIdentityAdminTestJSON
-
-
-class BaseIdentityAdminTestXML(BaseIdAdminTest):
-    @classmethod
-    def setUpClass(cls):
-        cls._interface = "xml"
-        super(BaseIdentityAdminTestXML, cls).setUpClass()
-
-
 class DataGenerator(object):
 
         def __init__(self, client):