diff --git a/README.rst b/README.rst
index d109a2d..13f4f61 100644
--- a/README.rst
+++ b/README.rst
@@ -223,7 +223,7 @@
 
     $ cd $TEMPEST_ROOT_DIR
     $ oslo-config-generator --config-file \
-        etc/config-generator.tempest.conf \
+        tempest/cmd/config-generator.tempest.conf \
         --output-file etc/tempest.conf
 
 After that, open up the ``etc/tempest.conf`` file and edit the
diff --git a/releasenotes/notes/add-httptimeout-in-restclient-ax78061900e3f3d7.yaml b/releasenotes/notes/add-httptimeout-in-restclient-ax78061900e3f3d7.yaml
new file mode 100644
index 0000000..a360f8e
--- /dev/null
+++ b/releasenotes/notes/add-httptimeout-in-restclient-ax78061900e3f3d7.yaml
@@ -0,0 +1,7 @@
+---
+features:
+  - RestClient now supports setting timeout in urllib3.poolmanager.
+    Clients will use CONF.service_clients.http_timeout for timeout
+    value to wait for http request to response.
+  - KeystoneAuthProvider will accept http_timeout and will use it in
+    get_credentials.
diff --git a/releasenotes/notes/add_subunit_describe_calls-5498a37e6cd66c4b.yaml b/releasenotes/notes/add_subunit_describe_calls-5498a37e6cd66c4b.yaml
index b457ddd..092014e 100644
--- a/releasenotes/notes/add_subunit_describe_calls-5498a37e6cd66c4b.yaml
+++ b/releasenotes/notes/add_subunit_describe_calls-5498a37e6cd66c4b.yaml
@@ -1,4 +1,8 @@
 ---
 features:
-  - Adds subunit-describe-calls. A parser for subunit streams to determine what
+  - |
+    Adds subunit-describe-calls. A parser for subunit streams to determine what
     REST API calls are made inside of a test and in what order they are called.
+
+      * Input can be piped in or a file can be specified
+      * Output is shortened for stdout, the output file has more information
diff --git a/releasenotes/notes/plugin-service-client-registration-00b19a2dd4935ba0.yaml b/releasenotes/notes/plugin-service-client-registration-00b19a2dd4935ba0.yaml
new file mode 100644
index 0000000..64f729a
--- /dev/null
+++ b/releasenotes/notes/plugin-service-client-registration-00b19a2dd4935ba0.yaml
@@ -0,0 +1,12 @@
+---
+features:
+  - A new optional interface `TempestPlugin.get_service_clients`
+    is available to plugins. It allows them to declare
+    any service client they implement. For now this is used by
+    tempest only, for auto-registration of service clients
+    in the new class `ServiceClients`.
+  - A new singleton class `clients.ClientsRegistry` is
+    available. It holds the service clients registration data
+    from all plugins. It is used by `ServiceClients` for
+    auto-registration of the service clients implemented
+    in plugins.
diff --git a/requirements.txt b/requirements.txt
index 058ea00..0f8e94d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@
 oslo.i18n>=2.1.0 # Apache-2.0
 oslo.log>=1.14.0 # Apache-2.0
 oslo.serialization>=1.10.0 # Apache-2.0
-oslo.utils>=3.15.0 # Apache-2.0
+oslo.utils>=3.16.0 # Apache-2.0
 six>=1.9.0 # MIT
 fixtures>=3.0.0 # Apache-2.0/BSD
 testscenarios>=0.4 # Apache-2.0/BSD
diff --git a/tempest/api/baremetal/admin/base.py b/tempest/api/baremetal/admin/base.py
index f7891dd..2d3f190 100644
--- a/tempest/api/baremetal/admin/base.py
+++ b/tempest/api/baremetal/admin/base.py
@@ -96,7 +96,7 @@
 
     @classmethod
     @creates('chassis')
-    def create_chassis(cls, description=None, expect_errors=False):
+    def create_chassis(cls, description=None):
         """Wrapper utility for creating test chassis.
 
         :param description: A description of the chassis. if not supplied,
diff --git a/tempest/api/compute/base.py b/tempest/api/compute/base.py
index 37aa5ac..5e75493 100644
--- a/tempest/api/compute/base.py
+++ b/tempest/api/compute/base.py
@@ -359,7 +359,7 @@
             for address in addresses:
                 if address['version'] == CONF.validation.ip_version_for_ssh:
                     return address['addr']
-            raise exceptions.ServerUnreachable()
+            raise exceptions.ServerUnreachable(server_id=server['id'])
         else:
             raise exceptions.InvalidConfiguration()
 
diff --git a/tempest/api/compute/security_groups/test_security_groups_negative.py b/tempest/api/compute/security_groups/test_security_groups_negative.py
index 5125e2b..e6abf28 100644
--- a/tempest/api/compute/security_groups/test_security_groups_negative.py
+++ b/tempest/api/compute/security_groups/test_security_groups_negative.py
@@ -44,9 +44,11 @@
             security_group_id.append(body[i]['id'])
         # Generate a non-existent security group id
         while True:
-            non_exist_id = data_utils.rand_int_id(start=999)
-            if self.neutron_available:
+            if (self.neutron_available and
+                test.is_extension_enabled('security-group', 'network')):
                 non_exist_id = data_utils.rand_uuid()
+            else:
+                non_exist_id = data_utils.rand_int_id(start=999)
             if non_exist_id not in security_group_id:
                 break
         return non_exist_id
diff --git a/tempest/api/compute/servers/test_attach_interfaces.py b/tempest/api/compute/servers/test_attach_interfaces.py
index d02f86f..7c12bf9 100644
--- a/tempest/api/compute/servers/test_attach_interfaces.py
+++ b/tempest/api/compute/servers/test_attach_interfaces.py
@@ -21,6 +21,7 @@
 from tempest.common import waiters
 from tempest import config
 from tempest import exceptions
+from tempest.lib import decorators
 from tempest.lib import exceptions as lib_exc
 from tempest import test
 
@@ -272,6 +273,7 @@
                 break
         self.servers_client.remove_fixed_ip(server['id'], address=fixed_ip)
 
+    @decorators.skip_because(bug='1607714')
     @test.idempotent_id('2f3a0127-95c7-4977-92d2-bc5aec602fb4')
     def test_reassign_port_between_servers(self):
         """Tests the following:
diff --git a/tempest/api/identity/admin/v3/test_projects.py b/tempest/api/identity/admin/v3/test_projects.py
index 60bb314..1879e46 100644
--- a/tempest/api/identity/admin/v3/test_projects.py
+++ b/tempest/api/identity/admin/v3/test_projects.py
@@ -1,4 +1,4 @@
-# Copyright 2013 OpenStack, LLC
+# Copyright 2013 OpenStack Foundation
 # All Rights Reserved.
 #
 #    Licensed under the Apache License, Version 2.0 (the "License"); you may
diff --git a/tempest/api/identity/admin/v3/test_projects_negative.py b/tempest/api/identity/admin/v3/test_projects_negative.py
index e661f42..c76b9ee 100644
--- a/tempest/api/identity/admin/v3/test_projects_negative.py
+++ b/tempest/api/identity/admin/v3/test_projects_negative.py
@@ -1,4 +1,4 @@
-# Copyright 2013 OpenStack, LLC
+# Copyright 2013 OpenStack Foundation
 # All Rights Reserved.
 #
 #    Licensed under the Apache License, Version 2.0 (the "License"); you may
diff --git a/tempest/api/identity/v2/test_ec2_credentials.py b/tempest/api/identity/v2/test_ec2_credentials.py
index 3c379f0..8f493aa 100644
--- a/tempest/api/identity/v2/test_ec2_credentials.py
+++ b/tempest/api/identity/v2/test_ec2_credentials.py
@@ -51,7 +51,6 @@
     def test_list_ec2_credentials(self):
         """Get the list of user ec2 credentials."""
         created_creds = []
-        fetched_creds = []
         # create first ec2 credentials
         creds1 = self.non_admin_users_client.create_user_ec2_credential(
             self.creds.user_id,
diff --git a/tempest/api/image/v2/test_images_negative.py b/tempest/api/image/v2/test_images_negative.py
index 14de8fd..f60fb0c 100644
--- a/tempest/api/image/v2/test_images_negative.py
+++ b/tempest/api/image/v2/test_images_negative.py
@@ -29,7 +29,7 @@
         ** get image with image_id=NULL
         ** get the deleted image
         ** delete non-existent image
-        ** delete rimage with  image_id=NULL
+        ** delete image with image_id=NULL
         ** delete the deleted image
      """
 
diff --git a/tempest/api/network/test_networks.py b/tempest/api/network/test_networks.py
index bf80ff5..3825f84 100644
--- a/tempest/api/network/test_networks.py
+++ b/tempest/api/network/test_networks.py
@@ -127,7 +127,7 @@
     def _get_allocation_pools_from_gateway(cls, ip_version):
         """Return allocation range for subnet of given gateway"""
         gateway = cls._get_gateway_from_tempest_conf(ip_version)
-        return [{'start': str(gateway + 2), 'end': str(gateway + 3)}]
+        return [{'start': str(gateway + 2), 'end': str(gateway + 6)}]
 
     def subnet_dict(self, include_keys):
         # Return a subnet dict which has include_keys and their corresponding
@@ -559,7 +559,7 @@
         # Verifies Subnet GW is set in IPv6
         self.assertEqual(subnet1['gateway_ip'], ipv6_gateway)
         # Verifies Subnet GW is None in IPv4
-        self.assertEqual(subnet2['gateway_ip'], None)
+        self.assertIsNone(subnet2['gateway_ip'])
         # Verifies all 2 subnets in the same network
         body = self.subnets_client.list_subnets()
         subnets = [sub['id'] for sub in body['subnets']
diff --git a/tempest/api/orchestration/stacks/templates/neutron_basic.yaml b/tempest/api/orchestration/stacks/templates/neutron_basic.yaml
index be33c94..ccb1b54 100644
--- a/tempest/api/orchestration/stacks/templates/neutron_basic.yaml
+++ b/tempest/api/orchestration/stacks/templates/neutron_basic.yaml
@@ -58,7 +58,7 @@
             #!/bin/sh -v
 
             SIGNAL_DATA='{"Status": "SUCCESS", "Reason": "SmokeServerNeutron created", "Data": "Application has completed configuration.", "UniqueId": "00000"}'
-            while ! curl --fail -X PUT -H 'Content-Type:' --data-binary "$SIGNAL_DATA" \
+            while ! curl --insecure --fail -X PUT -H 'Content-Type:' --data-binary "$SIGNAL_DATA" \
             'wait_handle' ; do sleep 3; done
           params:
             wait_handle: {get_resource: WaitHandleNeutron}
diff --git a/tempest/api/volume/admin/test_volume_types.py b/tempest/api/volume/admin/test_volume_types.py
index 27f6ccb..8eae085 100644
--- a/tempest/api/volume/admin/test_volume_types.py
+++ b/tempest/api/volume/admin/test_volume_types.py
@@ -88,18 +88,21 @@
         # Create/get volume type.
         body = {}
         name = data_utils.rand_name("volume-type")
+        description = data_utils.rand_name("volume-type-description")
         proto = CONF.volume.storage_protocol
         vendor = CONF.volume.vendor_name
         extra_specs = {"storage_protocol": proto,
                        "vendor_name": vendor}
-        body = self.create_volume_type(
-            name=name,
-            extra_specs=extra_specs)
+        body = self.create_volume_type(description=description, name=name,
+                                       extra_specs=extra_specs)
         self.assertIn('id', body)
         self.assertIn('name', body)
-        self.assertEqual(body['name'], name,
+        self.assertEqual(name, body['name'],
                          "The created volume_type name is not equal "
                          "to the requested name")
+        self.assertEqual(description, body['description'],
+                         "The created volume_type_description name is "
+                         "not equal to the requested name")
         self.assertTrue(body['id'] is not None,
                         "Field volume_type id is empty or not found.")
         fetched_volume_type = self.admin_volume_types_client.show_volume_type(
diff --git a/tempest/api/volume/admin/test_volumes_backup.py b/tempest/api/volume/admin/test_volumes_backup.py
index b6dc488..b144c7c 100644
--- a/tempest/api/volume/admin/test_volumes_backup.py
+++ b/tempest/api/volume/admin/test_volumes_backup.py
@@ -166,6 +166,23 @@
         self.admin_backups_client.wait_for_backup_status(import_backup['id'],
                                                          'available')
 
+    @test.idempotent_id('47a35425-a891-4e13-961c-c45deea21e94')
+    def test_volume_backup_reset_status(self):
+        # Create a backup
+        backup_name = data_utils.rand_name('Backup')
+        backup = self.admin_backups_client.create_backup(
+            volume_id=self.volume['id'], name=backup_name)['backup']
+        self.addCleanup(self.admin_backups_client.delete_backup,
+                        backup['id'])
+        self.assertEqual(backup_name, backup['name'])
+        self.admin_backups_client.wait_for_backup_status(backup['id'],
+                                                         'available')
+        # Reset backup status to error
+        self.admin_backups_client.reset_backup_status(backup_id=backup['id'],
+                                                      status="error")
+        self.admin_backups_client.wait_for_backup_status(backup['id'],
+                                                         'error')
+
 
 class VolumesBackupsAdminV1Test(VolumesBackupsAdminV2Test):
     _api_version = 1
diff --git a/tempest/api/volume/v2/test_volumes_list.py b/tempest/api/volume/v2/test_volumes_list.py
index 5117e6c..1fdcb49 100644
--- a/tempest/api/volume/v2/test_volumes_list.py
+++ b/tempest/api/volume/v2/test_volumes_list.py
@@ -174,9 +174,9 @@
 
             # If cannot follow make sure it's because we have finished
             else:
-                self.assertListEqual([], remaining or [],
-                                     'No more pages reported, but still '
-                                     'missing ids %s' % remaining)
+                self.assertEqual([], remaining or [],
+                                 'No more pages reported, but still '
+                                 'missing ids %s' % remaining)
                 break
 
     @test.idempotent_id('e9138a2c-f67b-4796-8efa-635c196d01de')
diff --git a/tempest/clients.py b/tempest/clients.py
index fd010f2..e070637 100644
--- a/tempest/clients.py
+++ b/tempest/clients.py
@@ -22,9 +22,6 @@
 from tempest import exceptions
 from tempest.lib import auth
 from tempest.lib import exceptions as lib_exc
-from tempest.lib.services import compute
-from tempest.lib.services import image
-from tempest.lib.services import network
 from tempest import service_clients
 from tempest.services import baremetal
 from tempest.services import data_processing
@@ -127,133 +124,84 @@
         return configuration
 
     def _set_network_clients(self):
-        params = self.parameters['network']
-        self.network_agents_client = network.AgentsClient(
-            self.auth_provider, **params)
-        self.network_extensions_client = network.ExtensionsClient(
-            self.auth_provider, **params)
-        self.networks_client = network.NetworksClient(
-            self.auth_provider, **params)
-        self.subnetpools_client = network.SubnetpoolsClient(
-            self.auth_provider, **params)
-        self.subnets_client = network.SubnetsClient(
-            self.auth_provider, **params)
-        self.ports_client = network.PortsClient(
-            self.auth_provider, **params)
-        self.network_quotas_client = network.QuotasClient(
-            self.auth_provider, **params)
-        self.floating_ips_client = network.FloatingIPsClient(
-            self.auth_provider, **params)
-        self.metering_labels_client = network.MeteringLabelsClient(
-            self.auth_provider, **params)
-        self.metering_label_rules_client = network.MeteringLabelRulesClient(
-            self.auth_provider, **params)
-        self.routers_client = network.RoutersClient(
-            self.auth_provider, **params)
-        self.security_group_rules_client = network.SecurityGroupRulesClient(
-            self.auth_provider, **params)
-        self.security_groups_client = network.SecurityGroupsClient(
-            self.auth_provider, **params)
-        self.network_versions_client = network.NetworkVersionsClient(
-            self.auth_provider, **params)
+        self.network_agents_client = self.network.AgentsClient()
+        self.network_extensions_client = self.network.ExtensionsClient()
+        self.networks_client = self.network.NetworksClient()
+        self.subnetpools_client = self.network.SubnetpoolsClient()
+        self.subnets_client = self.network.SubnetsClient()
+        self.ports_client = self.network.PortsClient()
+        self.network_quotas_client = self.network.QuotasClient()
+        self.floating_ips_client = self.network.FloatingIPsClient()
+        self.metering_labels_client = self.network.MeteringLabelsClient()
+        self.metering_label_rules_client = (
+            self.network.MeteringLabelRulesClient())
+        self.routers_client = self.network.RoutersClient()
+        self.security_group_rules_client = (
+            self.network.SecurityGroupRulesClient())
+        self.security_groups_client = self.network.SecurityGroupsClient()
+        self.network_versions_client = self.network.NetworkVersionsClient()
 
     def _set_image_clients(self):
         if CONF.service_available.glance:
-            params = self.parameters['image']
-            self.image_client = image.v1.ImagesClient(
-                self.auth_provider, **params)
-            self.image_member_client = image.v1.ImageMembersClient(
-                self.auth_provider, **params)
-
-            self.image_client_v2 = image.v2.ImagesClient(
-                self.auth_provider, **params)
-            self.image_member_client_v2 = image.v2.ImageMembersClient(
-                self.auth_provider, **params)
-            self.namespaces_client = image.v2.NamespacesClient(
-                self.auth_provider, **params)
-            self.resource_types_client = image.v2.ResourceTypesClient(
-                self.auth_provider, **params)
-            self.schemas_client = image.v2.SchemasClient(
-                self.auth_provider, **params)
+            self.image_client = self.image_v1.ImagesClient()
+            self.image_member_client = self.image_v1.ImageMembersClient()
+            self.image_client_v2 = self.image_v2.ImagesClient()
+            self.image_member_client_v2 = self.image_v2.ImageMembersClient()
+            self.namespaces_client = self.image_v2.NamespacesClient()
+            self.resource_types_client = self.image_v2.ResourceTypesClient()
+            self.schemas_client = self.image_v2.SchemasClient()
 
     def _set_compute_clients(self):
-        params = self.parameters['compute']
-
-        self.agents_client = compute.AgentsClient(self.auth_provider, **params)
-        self.compute_networks_client = compute.NetworksClient(
-            self.auth_provider, **params)
-        self.migrations_client = compute.MigrationsClient(self.auth_provider,
-                                                          **params)
+        self.agents_client = self.compute.AgentsClient()
+        self.compute_networks_client = self.compute.NetworksClient()
+        self.migrations_client = self.compute.MigrationsClient()
         self.security_group_default_rules_client = (
-            compute.SecurityGroupDefaultRulesClient(self.auth_provider,
-                                                    **params))
-        self.certificates_client = compute.CertificatesClient(
-            self.auth_provider, **params)
-        self.servers_client = compute.ServersClient(
-            self.auth_provider,
-            enable_instance_password=CONF.compute_feature_enabled
-                .enable_instance_password,
-            **params)
-        self.server_groups_client = compute.ServerGroupsClient(
-            self.auth_provider, **params)
-        self.limits_client = compute.LimitsClient(self.auth_provider, **params)
-        self.compute_images_client = compute.ImagesClient(self.auth_provider,
-                                                          **params)
-        self.keypairs_client = compute.KeyPairsClient(self.auth_provider,
-                                                      **params)
-        self.quotas_client = compute.QuotasClient(self.auth_provider, **params)
-        self.quota_classes_client = compute.QuotaClassesClient(
-            self.auth_provider, **params)
-        self.flavors_client = compute.FlavorsClient(self.auth_provider,
-                                                    **params)
-        self.extensions_client = compute.ExtensionsClient(self.auth_provider,
-                                                          **params)
-        self.floating_ip_pools_client = compute.FloatingIPPoolsClient(
-            self.auth_provider, **params)
-        self.floating_ips_bulk_client = compute.FloatingIPsBulkClient(
-            self.auth_provider, **params)
-        self.compute_floating_ips_client = compute.FloatingIPsClient(
-            self.auth_provider, **params)
+            self.compute.SecurityGroupDefaultRulesClient())
+        self.certificates_client = self.compute.CertificatesClient()
+        eip = CONF.compute_feature_enabled.enable_instance_password
+        self.servers_client = self.compute.ServersClient(
+            enable_instance_password=eip)
+        self.server_groups_client = self.compute.ServerGroupsClient()
+        self.limits_client = self.compute.LimitsClient()
+        self.compute_images_client = self.compute.ImagesClient()
+        self.keypairs_client = self.compute.KeyPairsClient()
+        self.quotas_client = self.compute.QuotasClient()
+        self.quota_classes_client = self.compute.QuotaClassesClient()
+        self.flavors_client = self.compute.FlavorsClient()
+        self.extensions_client = self.compute.ExtensionsClient()
+        self.floating_ip_pools_client = self.compute.FloatingIPPoolsClient()
+        self.floating_ips_bulk_client = self.compute.FloatingIPsBulkClient()
+        self.compute_floating_ips_client = self.compute.FloatingIPsClient()
         self.compute_security_group_rules_client = (
-            compute.SecurityGroupRulesClient(self.auth_provider, **params))
-        self.compute_security_groups_client = compute.SecurityGroupsClient(
-            self.auth_provider, **params)
-        self.interfaces_client = compute.InterfacesClient(self.auth_provider,
-                                                          **params)
-        self.fixed_ips_client = compute.FixedIPsClient(self.auth_provider,
-                                                       **params)
-        self.availability_zone_client = compute.AvailabilityZoneClient(
-            self.auth_provider, **params)
-        self.aggregates_client = compute.AggregatesClient(self.auth_provider,
-                                                          **params)
-        self.services_client = compute.ServicesClient(self.auth_provider,
-                                                      **params)
-        self.tenant_usages_client = compute.TenantUsagesClient(
-            self.auth_provider, **params)
-        self.hosts_client = compute.HostsClient(self.auth_provider, **params)
-        self.hypervisor_client = compute.HypervisorClient(self.auth_provider,
-                                                          **params)
+            self.compute.SecurityGroupRulesClient())
+        self.compute_security_groups_client = (
+            self.compute.SecurityGroupsClient())
+        self.interfaces_client = self.compute.InterfacesClient()
+        self.fixed_ips_client = self.compute.FixedIPsClient()
+        self.availability_zone_client = self.compute.AvailabilityZoneClient()
+        self.aggregates_client = self.compute.AggregatesClient()
+        self.services_client = self.compute.ServicesClient()
+        self.tenant_usages_client = self.compute.TenantUsagesClient()
+        self.hosts_client = self.compute.HostsClient()
+        self.hypervisor_client = self.compute.HypervisorClient()
         self.instance_usages_audit_log_client = (
-            compute.InstanceUsagesAuditLogClient(self.auth_provider, **params))
-        self.tenant_networks_client = compute.TenantNetworksClient(
-            self.auth_provider, **params)
-        self.baremetal_nodes_client = compute.BaremetalNodesClient(
-            self.auth_provider, **params)
+            self.compute.InstanceUsagesAuditLogClient())
+        self.tenant_networks_client = self.compute.TenantNetworksClient()
+        self.baremetal_nodes_client = self.compute.BaremetalNodesClient()
 
         # NOTE: The following client needs special timeout values because
         # the API is a proxy for the other component.
-        params_volume = copy.deepcopy(params)
-        # Optional parameters
+        params_volume = {}
         for _key in ('build_interval', 'build_timeout'):
             _value = self.parameters['volume'].get(_key)
             if _value:
                 params_volume[_key] = _value
-        self.volumes_extensions_client = compute.VolumesClient(
-            self.auth_provider, **params_volume)
-        self.compute_versions_client = compute.VersionsClient(
-            self.auth_provider, **params_volume)
-        self.snapshots_extensions_client = compute.SnapshotsClient(
-            self.auth_provider, **params_volume)
+        self.volumes_extensions_client = self.compute.VolumesClient(
+            **params_volume)
+        self.compute_versions_client = self.compute.VersionsClient(
+            **params_volume)
+        self.snapshots_extensions_client = self.compute.SnapshotsClient(
+            **params_volume)
 
     def _set_identity_clients(self):
         params = self.parameters['identity']
diff --git a/tempest/cmd/subunit_describe_calls.py b/tempest/cmd/subunit_describe_calls.py
index 9391823..0f868a9 100644
--- a/tempest/cmd/subunit_describe_calls.py
+++ b/tempest/cmd/subunit_describe_calls.py
@@ -21,13 +21,14 @@
 Runtime Arguments
 -----------------
 
-**--subunit, -s**: (Required) The path to the subunit file being parsed
+**--subunit, -s**: (Optional) The path to the subunit file being parsed,
+defaults to stdin
 
 **--non-subunit-name, -n**: (Optional) The file_name that the logs are being
 stored in
 
-**--output-file, -o**: (Required) The path where the JSON output will be
-written to
+**--output-file, -o**: (Optional) The path where the JSON output will be
+written to. This contains more information than is present in stdout.
 
 **--ports, -p**: (Optional) The path to a JSON file describing the ports being
 used by different services
@@ -35,13 +36,14 @@
 Usage
 -----
 
-subunit-describe-calls will take in a file path via the --subunit parameter
-which contains either a subunit v1 or v2 stream. This is then parsed checking
-for details contained in the file_bytes of the --non-subunit-name parameter
-(the default is pythonlogging which is what Tempest uses to store logs). By
-default the OpenStack Kilo release port defaults (http://bit.ly/22jpF5P)
-are used unless a file is provided via the --ports option. The resulting output
-is dumped in JSON output to the path provided in the --output-file option.
+subunit-describe-calls will take in either stdin subunit v1 or v2 stream or a
+file path which contains either a subunit v1 or v2 stream passed via the
+--subunit parameter. This is then parsed checking for details contained in the
+file_bytes of the --non-subunit-name parameter (the default is pythonlogging
+which is what Tempest uses to store logs). By default the OpenStack Kilo
+release port defaults (http://bit.ly/22jpF5P) are used unless a file is
+provided via the --ports option. The resulting output is dumped in JSON output
+to the path provided in the --output-file option.
 
 Ports file JSON structure
 ^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -64,7 +66,11 @@
               "verb": "HTTP Verb",
               "service": "Name of the service",
               "url": "A shortened version of the URL called",
-              "status_code": "The status code of the response"
+              "status_code": "The status code of the response",
+              "request_headers": "The headers of the request",
+              "request_body": "The body of the request",
+              "response_headers": "The headers of the response",
+              "response_body": "The body of the response"
           }
       ]
   }
@@ -75,6 +81,7 @@
 import json
 import os
 import re
+import sys
 
 import subunit
 import testtools
@@ -91,6 +98,9 @@
                         '(?P<verb>\w*) (?P<url>.*) .*')
     port_re = re.compile(r'.*:(?P<port>\d+).*')
     path_re = re.compile(r'http[s]?://[^/]*/(?P<path>.*)')
+    request_re = re.compile(r'.* Request - Headers: (?P<headers>.*)')
+    response_re = re.compile(r'.* Response - Headers: (?P<headers>.*)')
+    body_re = re.compile(r'.*Body: (?P<body>.*)')
 
     # Based on mitaka defaults:
     # http://docs.openstack.org/mitaka/config-reference/
@@ -151,15 +161,46 @@
 
         calls = []
         for _, detail in details.items():
+            in_request = False
+            in_response = False
+            current_call = {}
             for line in detail.as_text().split("\n"):
-                match = self.url_re.match(line)
-                if match is not None:
-                    calls.append({
-                        "name": match.group("name"),
-                        "verb": match.group("verb"),
-                        "status_code": match.group("code"),
-                        "service": self.get_service(match.group("url")),
-                        "url": self.url_path(match.group("url"))})
+                url_match = self.url_re.match(line)
+                request_match = self.request_re.match(line)
+                response_match = self.response_re.match(line)
+                body_match = self.body_re.match(line)
+
+                if url_match is not None:
+                    if current_call != {}:
+                        calls.append(current_call.copy())
+                        current_call = {}
+                        in_request, in_response = False, False
+                    current_call.update({
+                        "name": url_match.group("name"),
+                        "verb": url_match.group("verb"),
+                        "status_code": url_match.group("code"),
+                        "service": self.get_service(url_match.group("url")),
+                        "url": self.url_path(url_match.group("url"))})
+                elif request_match is not None:
+                    in_request, in_response = True, False
+                    current_call.update(
+                        {"request_headers": request_match.group("headers")})
+                elif in_request and body_match is not None:
+                    in_request = False
+                    current_call.update(
+                        {"request_body": body_match.group(
+                            "body")})
+                elif response_match is not None:
+                    in_request, in_response = False, True
+                    current_call.update(
+                        {"response_headers": response_match.group(
+                            "headers")})
+                elif in_response and body_match is not None:
+                    in_response = False
+                    current_call.update(
+                        {"response_body": body_match.group("body")})
+            if current_call != {}:
+                calls.append(current_call.copy())
 
         return calls
 
@@ -206,8 +247,9 @@
         self.prog = "subunit-describe-calls"
 
         self.add_argument(
-            "-s", "--subunit", metavar="<subunit file>", required=True,
-            default=None, help="The path to the subunit output file.")
+            "-s", "--subunit", metavar="<subunit file>",
+            nargs="?", type=argparse.FileType('rb'), default=sys.stdin,
+            help="The path to the subunit output file.")
 
         self.add_argument(
             "-n", "--non-subunit-name", metavar="<non subunit name>",
@@ -216,19 +258,18 @@
 
         self.add_argument(
             "-o", "--output-file", metavar="<output file>", default=None,
-            help="The output file name for the json.", required=True)
+            help="The output file name for the json.")
 
         self.add_argument(
             "-p", "--ports", metavar="<ports file>", default=None,
             help="A JSON file describing the ports for each service.")
 
 
-def parse(subunit_file, non_subunit_name, ports):
+def parse(stream, non_subunit_name, ports):
     if ports is not None and os.path.exists(ports):
         ports = json.loads(open(ports).read())
 
     url_parser = UrlParser(ports)
-    stream = open(subunit_file, 'rb')
     suite = subunit.ByteStreamToStreamResult(
         stream, non_subunit_name=non_subunit_name)
     result = testtools.StreamToExtendedDecorator(url_parser)
@@ -248,8 +289,21 @@
 
 
 def output(url_parser, output_file):
-    with open(output_file, "w") as outfile:
-        outfile.write(json.dumps(url_parser.test_logs))
+    if output_file is not None:
+        with open(output_file, "w") as outfile:
+            outfile.write(json.dumps(url_parser.test_logs))
+        return
+
+    for test_name, items in url_parser.test_logs.iteritems():
+        sys.stdout.write('{0}\n'.format(test_name))
+        if not items:
+            sys.stdout.write('\n')
+            continue
+        for item in items:
+            sys.stdout.write('\t- {0} {1} request for {2} to {3}\n'.format(
+                item.get('status_code'), item.get('verb'),
+                item.get('service'), item.get('url')))
+        sys.stdout.write('\n')
 
 
 def entry_point():
diff --git a/tempest/common/waiters.py b/tempest/common/waiters.py
index df08e30..073481c 100644
--- a/tempest/common/waiters.py
+++ b/tempest/common/waiters.py
@@ -141,7 +141,7 @@
     while int(time.time()) - start < client.build_timeout:
         image = show_image(image_id)
         # Compute image client returns response wrapped in 'image' element
-        # which is not case with Glance image client.
+        # which is not the case with Glance image client.
         if 'image' in image:
             image = image['image']
 
diff --git a/tempest/config.py b/tempest/config.py
index 0c2b913..6bae021 100644
--- a/tempest/config.py
+++ b/tempest/config.py
@@ -173,6 +173,16 @@
                      "a domain scoped token to use admin APIs")
 ]
 
+service_clients_group = cfg.OptGroup(name='service-clients',
+                                     title="Service Clients Options")
+
+ServiceClientsGroup = [
+    cfg.IntOpt('http_timeout',
+               default=60,
+               help='Timeout in seconds to wait for the http request to '
+                    'return'),
+]
+
 identity_feature_group = cfg.OptGroup(name='identity-feature-enabled',
                                       title='Enabled Identity Features')
 
@@ -1119,6 +1129,7 @@
     (compute_group, ComputeGroup),
     (compute_features_group, ComputeFeaturesGroup),
     (identity_group, IdentityGroup),
+    (service_clients_group, ServiceClientsGroup),
     (identity_feature_group, IdentityFeatureGroup),
     (image_group, ImageGroup),
     (image_feature_group, ImageFeaturesGroup),
@@ -1184,6 +1195,7 @@
         self.compute = _CONF.compute
         self.compute_feature_enabled = _CONF['compute-feature-enabled']
         self.identity = _CONF.identity
+        self.service_clients = _CONF['service-clients']
         self.identity_feature_enabled = _CONF['identity-feature-enabled']
         self.image = _CONF.image
         self.image_feature_enabled = _CONF['image-feature-enabled']
@@ -1372,6 +1384,7 @@
         * `disable_ssl_certificate_validation`
         * `ca_certs`
         * `trace_requests`
+        * `http_timeout`
 
     The dict returned by this does not fit a few service clients:
 
@@ -1393,7 +1406,8 @@
         'disable_ssl_certificate_validation':
             CONF.identity.disable_ssl_certificate_validation,
         'ca_certs': CONF.identity.ca_certificates_file,
-        'trace_requests': CONF.debug.trace_requests
+        'trace_requests': CONF.debug.trace_requests,
+        'http_timeout': CONF.service_clients.http_timeout
     }
 
     if service_client_name is None:
diff --git a/tempest/exceptions.py b/tempest/exceptions.py
index 67faad5..272f6e3 100644
--- a/tempest/exceptions.py
+++ b/tempest/exceptions.py
@@ -63,7 +63,8 @@
 
 
 class ServerUnreachable(exceptions.TempestException):
-    message = "The server is not reachable via the configured network"
+    message = ("Server %(server_id)s is not reachable via "
+               "the configured network")
 
 
 # NOTE(andreaf) This exception is added here to facilitate the migration
diff --git a/tempest/lib/auth.py b/tempest/lib/auth.py
index 54a7002..1857a43 100644
--- a/tempest/lib/auth.py
+++ b/tempest/lib/auth.py
@@ -260,11 +260,13 @@
 
     def __init__(self, credentials, auth_url,
                  disable_ssl_certificate_validation=None,
-                 ca_certs=None, trace_requests=None, scope='project'):
+                 ca_certs=None, trace_requests=None, scope='project',
+                 http_timeout=None):
         super(KeystoneAuthProvider, self).__init__(credentials, scope)
         self.dscv = disable_ssl_certificate_validation
         self.ca_certs = ca_certs
         self.trace_requests = trace_requests
+        self.http_timeout = http_timeout
         self.auth_url = auth_url
         self.auth_client = self._auth_client(auth_url)
 
@@ -342,7 +344,8 @@
     def _auth_client(self, auth_url):
         return json_v2id.TokenClient(
             auth_url, disable_ssl_certificate_validation=self.dscv,
-            ca_certs=self.ca_certs, trace_requests=self.trace_requests)
+            ca_certs=self.ca_certs, trace_requests=self.trace_requests,
+            http_timeout=self.http_timeout)
 
     def _auth_params(self):
         """Auth parameters to be passed to the token request
@@ -429,7 +432,8 @@
     def _auth_client(self, auth_url):
         return json_v3id.V3TokenClient(
             auth_url, disable_ssl_certificate_validation=self.dscv,
-            ca_certs=self.ca_certs, trace_requests=self.trace_requests)
+            ca_certs=self.ca_certs, trace_requests=self.trace_requests,
+            http_timeout=self.http_timeout)
 
     def _auth_params(self):
         """Auth parameters to be passed to the token request
@@ -595,7 +599,7 @@
 
 def get_credentials(auth_url, fill_in=True, identity_version='v2',
                     disable_ssl_certificate_validation=None, ca_certs=None,
-                    trace_requests=None, **kwargs):
+                    trace_requests=None, http_timeout=None, **kwargs):
     """Builds a credentials object based on the configured auth_version
 
     :param auth_url (string): Full URI of the OpenStack Identity API(Keystone)
@@ -611,6 +615,8 @@
     :param ca_certs: CA certificate bundle for validation of certificates
            in SSL API requests to the auth system
     :param trace_requests: trace in log API requests to the auth system
+    :param http_timeout: timeout in seconds to wait for the http request to
+           return
     :param kwargs (dict): Dict of credential key/value pairs
 
     Examples:
@@ -634,7 +640,8 @@
         dscv = disable_ssl_certificate_validation
         auth_provider = auth_provider_class(
             creds, auth_url, disable_ssl_certificate_validation=dscv,
-            ca_certs=ca_certs, trace_requests=trace_requests)
+            ca_certs=ca_certs, trace_requests=trace_requests,
+            http_timeout=http_timeout)
         creds = auth_provider.fill_credentials()
     return creds
 
diff --git a/tempest/lib/common/http.py b/tempest/lib/common/http.py
index dffc5f9..86ea26e 100644
--- a/tempest/lib/common/http.py
+++ b/tempest/lib/common/http.py
@@ -18,7 +18,7 @@
 
 class ClosingHttp(urllib3.poolmanager.PoolManager):
     def __init__(self, disable_ssl_certificate_validation=False,
-                 ca_certs=None):
+                 ca_certs=None, timeout=None):
         kwargs = {}
 
         if disable_ssl_certificate_validation:
@@ -29,6 +29,9 @@
             kwargs['cert_reqs'] = 'CERT_REQUIRED'
             kwargs['ca_certs'] = ca_certs
 
+        if timeout:
+            kwargs['timeout'] = timeout
+
         super(ClosingHttp, self).__init__(**kwargs)
 
     def request(self, url, method, *args, **kwargs):
diff --git a/tempest/lib/common/rest_client.py b/tempest/lib/common/rest_client.py
index 1b0f53a..7e1a442 100644
--- a/tempest/lib/common/rest_client.py
+++ b/tempest/lib/common/rest_client.py
@@ -66,6 +66,8 @@
                          TLS server cert
     :param str trace_request: Regex to use for specifying logging the entirety
                               of the request and response payload
+    :param str http_timeout: Timeout in seconds to wait for the http request to
+                             return
     """
     TYPE = "json"
 
@@ -78,7 +80,7 @@
                  endpoint_type='publicURL',
                  build_interval=1, build_timeout=60,
                  disable_ssl_certificate_validation=False, ca_certs=None,
-                 trace_requests='', name=None):
+                 trace_requests='', name=None, http_timeout=None):
         self.auth_provider = auth_provider
         self.service = service
         self.region = region
@@ -99,7 +101,8 @@
                                        'vary', 'www-authenticate'))
         dscv = disable_ssl_certificate_validation
         self.http_obj = http.ClosingHttp(
-            disable_ssl_certificate_validation=dscv, ca_certs=ca_certs)
+            disable_ssl_certificate_validation=dscv, ca_certs=ca_certs,
+            timeout=http_timeout)
 
     def _get_type(self):
         return self.TYPE
diff --git a/tempest/lib/common/utils/data_utils.py b/tempest/lib/common/utils/data_utils.py
index 93382c0..6b6548e 100644
--- a/tempest/lib/common/utils/data_utils.py
+++ b/tempest/lib/common/utils/data_utils.py
@@ -75,7 +75,7 @@
     ascii_char = string.ascii_letters
     digits = string.digits
     digit = random.choice(string.digits)
-    puncs = '~!@#$%^&*_=+'
+    puncs = '~!@#%^&*_=+'
     punc = random.choice(puncs)
     seed = ascii_char + digits + puncs
     pre = upper + digit + punc
diff --git a/tempest/lib/exceptions.py b/tempest/lib/exceptions.py
index 5ca78f9..de2d713 100644
--- a/tempest/lib/exceptions.py
+++ b/tempest/lib/exceptions.py
@@ -229,3 +229,13 @@
 
 class UnknownServiceClient(TempestException):
     message = "Service clients named %(services)s are not known"
+
+
+class ServiceClientRegistrationException(TempestException):
+    message = ("Error registering module %(name)s in path %(module_path)s, "
+               "with service %(service_version)s and clients "
+               "%(client_names)s: %(detailed_error)s")
+
+
+class PluginRegistrationException(TempestException):
+    message = "Error registering plugin %(name)s: %(detailed_error)s"
diff --git a/tempest/lib/services/clients.py b/tempest/lib/services/clients.py
new file mode 100644
index 0000000..8054e62
--- /dev/null
+++ b/tempest/lib/services/clients.py
@@ -0,0 +1,36 @@
+# Copyright (c) 2016 Hewlett-Packard Enterprise Development Company, L.P.
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from tempest.lib.common.utils import misc
+from tempest.lib import exceptions
+
+
+@misc.singleton
+class ClientsRegistry(object):
+    """Registry of all service clients available from plugins"""
+
+    def __init__(self):
+        self._service_clients = {}
+
+    def register_service_client(self, plugin_name, service_client_data):
+        if plugin_name in self._service_clients:
+            detailed_error = 'Clients for plugin %s already registered'
+            raise exceptions.PluginRegistrationException(
+                name=plugin_name,
+                detailed_error=detailed_error % plugin_name)
+        self._service_clients[plugin_name] = service_client_data
+
+    def get_service_clients(self):
+        return self._service_clients
diff --git a/tempest/lib/services/identity/v2/token_client.py b/tempest/lib/services/identity/v2/token_client.py
index 5716027..a5d7c86 100644
--- a/tempest/lib/services/identity/v2/token_client.py
+++ b/tempest/lib/services/identity/v2/token_client.py
@@ -22,11 +22,11 @@
 class TokenClient(rest_client.RestClient):
 
     def __init__(self, auth_url, disable_ssl_certificate_validation=None,
-                 ca_certs=None, trace_requests=None):
+                 ca_certs=None, trace_requests=None, **kwargs):
         dscv = disable_ssl_certificate_validation
         super(TokenClient, self).__init__(
             None, None, None, disable_ssl_certificate_validation=dscv,
-            ca_certs=ca_certs, trace_requests=trace_requests)
+            ca_certs=ca_certs, trace_requests=trace_requests, **kwargs)
 
         if auth_url is None:
             raise exceptions.IdentityError("Couldn't determine auth_url")
diff --git a/tempest/lib/services/identity/v3/token_client.py b/tempest/lib/services/identity/v3/token_client.py
index 964d43f..c1f7e7b 100644
--- a/tempest/lib/services/identity/v3/token_client.py
+++ b/tempest/lib/services/identity/v3/token_client.py
@@ -22,11 +22,11 @@
 class V3TokenClient(rest_client.RestClient):
 
     def __init__(self, auth_url, disable_ssl_certificate_validation=None,
-                 ca_certs=None, trace_requests=None):
+                 ca_certs=None, trace_requests=None, **kwargs):
         dscv = disable_ssl_certificate_validation
         super(V3TokenClient, self).__init__(
             None, None, None, disable_ssl_certificate_validation=dscv,
-            ca_certs=ca_certs, trace_requests=trace_requests)
+            ca_certs=ca_certs, trace_requests=trace_requests, **kwargs)
 
         if auth_url is None:
             raise exceptions.IdentityError("Couldn't determine auth_url")
diff --git a/tempest/scenario/manager.py b/tempest/scenario/manager.py
index f889c44..b151375 100644
--- a/tempest/scenario/manager.py
+++ b/tempest/scenario/manager.py
@@ -664,7 +664,7 @@
             for address in addresses:
                 if address['version'] == CONF.validation.ip_version_for_ssh:
                     return address['addr']
-            raise exceptions.ServerUnreachable()
+            raise exceptions.ServerUnreachable(server_id=server['id'])
         else:
             raise exceptions.InvalidConfiguration()
 
diff --git a/tempest/service_clients.py b/tempest/service_clients.py
index 386e621..a5bc86e 100644
--- a/tempest/service_clients.py
+++ b/tempest/service_clients.py
@@ -14,8 +14,26 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import copy
+import importlib
+import inspect
+import logging
+
 from tempest.lib import auth
 from tempest.lib import exceptions
+from tempest.lib.services import clients
+from tempest.lib.services import compute
+from tempest.lib.services import image
+from tempest.lib.services import network
+
+LOG = logging.getLogger(__name__)
+
+client_modules_by_service_name = {
+    'compute': compute,
+    'image.v1': image.v1,
+    'image.v2': image.v2,
+    'network': network
+}
 
 
 def tempest_modules():
@@ -29,9 +47,129 @@
 
 
 def available_modules():
-    """List of service client modules available in Tempest and plugins"""
-    # TODO(andreaf) For now this returns only tempest_modules
-    return tempest_modules()
+    """List of service client modules available in Tempest and plugins
+
+    The list of available modules can be used for automatic configuration.
+
+    :raise PluginRegistrationException: if a plugin exposes a service_version
+        already defined by Tempest or another plugin.
+
+    Examples:
+
+        >>> from tempest import config
+        >>> params = {}
+        >>> for service_version in available_modules():
+        >>>     service = service_version.split('.')[0]
+        >>>     params[service] = config.service_client_config(service)
+        >>> service_clients = ServiceClients(creds, identity_uri,
+        >>>                                  client_parameters=params)
+    """
+    extra_service_versions = set([])
+    plugin_services = clients.ClientsRegistry().get_service_clients()
+    for plugin_name in plugin_services:
+        plug_service_versions = set([x['service_version'] for x in
+                                     plugin_services[plugin_name]])
+        # If a plugin exposes a duplicate service_version raise an exception
+        if plug_service_versions:
+            if not plug_service_versions.isdisjoint(extra_service_versions):
+                detailed_error = (
+                    'Plugin %s is trying to register a service %s already '
+                    'claimed by another one' % (plugin_name,
+                                                extra_service_versions &
+                                                plug_service_versions))
+                raise exceptions.PluginRegistrationException(
+                    name=plugin_name, detailed_error=detailed_error)
+            if not plug_service_versions.isdisjoint(tempest_modules()):
+                detailed_error = (
+                    'Plugin %s is trying to register a service %s already '
+                    'claimed by a Tempest one' % (plugin_name,
+                                                  tempest_modules() &
+                                                  plug_service_versions))
+                raise exceptions.PluginRegistrationException(
+                    name=plugin_name, detailed_error=detailed_error)
+        extra_service_versions |= plug_service_versions
+    return tempest_modules() | extra_service_versions
+
+
+class ClientsFactory(object):
+    """Builds service clients for a service client module
+
+    This class implements the logic of feeding service client parameters
+    to service clients from a specific module. It allows setting the
+    parameters once and obtaining new instances of the clients without the
+    need of passing any parameter.
+
+    ClientsFactory can be used directly, or consumed via the `ServiceClients`
+    class, which manages the authorization part.
+    """
+
+    def __init__(self, module_path, client_names, auth_provider, **kwargs):
+        """Initialises the client factory
+
+        :param module_path: Path to module that includes all service clients.
+            All service client classes must be exposed by a single module.
+            If they are separated in different modules, defining __all__
+            in the root module can help, similar to what is done by service
+            clients in tempest.
+        :param client_names: List or set of names of the service client
+            classes.
+        :param auth_provider: The auth provider used to initialise client.
+        :param kwargs: Parameters to be passed to all clients. Parameters
+            values can be overwritten when clients are initialised, but
+            parameters cannot be deleted.
+        :raise ImportError if the specified module_path cannot be imported
+
+        Example:
+
+            >>> # Get credentials and an auth_provider
+            >>> clients = ClientsFactory(
+            >>>     module_path='my_service.my_service_clients',
+            >>>     client_names=['ServiceClient1', 'ServiceClient2'],
+            >>>     auth_provider=auth_provider,
+            >>>     service='my_service',
+            >>>     region='region1')
+            >>> my_api_client = clients.MyApiClient()
+            >>> my_api_client_region2 = clients.MyApiClient(region='region2')
+
+        """
+        # Import the module. If it's not importable, the raised exception
+        # provides good enough information about what happened
+        _module = importlib.import_module(module_path)
+        # If any of the classes is not in the module we fail
+        for class_name in client_names:
+            # TODO(andreaf) This always passes all parameters to all clients.
+            # In future to allow clients to specify the list of parameters
+            # that they accept based out of a list of standard ones.
+
+            # Obtain the class
+            klass = self._get_class(_module, class_name)
+            final_kwargs = copy.copy(kwargs)
+
+            # Set the function as an attribute of the factory
+            setattr(self, class_name, self._get_partial_class(
+                klass, auth_provider, final_kwargs))
+
+    @classmethod
+    def _get_partial_class(cls, klass, auth_provider, kwargs):
+
+        # Define a function that returns a new class instance by
+        # combining default kwargs with extra ones
+        def partial_class(**later_kwargs):
+            kwargs.update(later_kwargs)
+            return klass(auth_provider=auth_provider, **kwargs)
+
+        return partial_class
+
+    @classmethod
+    def _get_class(cls, module, class_name):
+        klass = getattr(module, class_name, None)
+        if not klass:
+            msg = 'Invalid class name, %s is not found in %s'
+            raise AttributeError(msg % (class_name, module))
+        if not inspect.isclass(klass):
+            msg = 'Expected a class, got %s of type %s instead'
+            raise TypeError(msg % (klass, type(klass)))
+        return klass
 
 
 class ServiceClients(object):
@@ -101,11 +239,11 @@
                              mandatory parameter, and it will so soon.
         :param region: Default value of region for service clients.
         :param scope: default scope for tokens produced by the auth provider
-        :param disable_ssl_certificate_validation Applies to auth and to all
+        :param disable_ssl_certificate_validation: Applies to auth and to all
                                                   service clients.
-        :param ca_certs Applies to auth and to all service clients.
-        :param trace_requests Applies to auth and to all service clients.
-        :param client_parameters Dictionary with parameters for service
+        :param ca_certs: Applies to auth and to all service clients.
+        :param trace_requests: Applies to auth and to all service clients.
+        :param client_parameters: Dictionary with parameters for service
             clients. Keys of the dictionary are the service client service
             name, as declared in `service_clients.available_modules()` except
             for the version. Values are dictionaries of parameters that are
@@ -120,6 +258,7 @@
             >>> client_parameters['service_y'] = params_service_y
 
         """
+        self._registered_services = set([])
         self.credentials = credentials
         self.identity_uri = identity_uri
         if not identity_uri:
@@ -161,6 +300,94 @@
             raise exceptions.UnknownServiceClient(
                 services=list(client_parameters.keys()))
 
+        # Register service clients owned by tempest
+        for service in tempest_modules():
+            if service in list(client_modules_by_service_name):
+                attribute = service.replace('.', '_')
+                configs = service.split('.')[0]
+                module = client_modules_by_service_name[service]
+                self.register_service_client_module(
+                    attribute, service, module.__name__,
+                    module.__all__, **self.parameters[configs])
+
+        # Register service clients from plugins
+        clients_registry = clients.ClientsRegistry()
+        plugin_service_clients = clients_registry.get_service_clients()
+        for plugin in plugin_service_clients:
+            service_clients = plugin_service_clients[plugin]
+            # Each plugin returns a list of service client parameters
+            for service_client in service_clients:
+                # NOTE(andreaf) If a plugin cannot register, stop the
+                # registration process, log some details to help
+                # troubleshooting, and re-raise
+                try:
+                    self.register_service_client_module(**service_client)
+                except Exception:
+                    LOG.exception(
+                        'Failed to register service client from plugin %s '
+                        'with parameters %s' % (plugin, service_client))
+                    raise
+
+    def register_service_client_module(self, name, service_version,
+                                       module_path, client_names, **kwargs):
+        """Register a service client module
+
+        Initiates a client factory for the specified module, using this
+        class auth_provider, and accessible via a `name` attribute in the
+        service client.
+
+        :param name: Name used to access the client
+        :param service_version: Name of the service complete with version.
+            Used to track registered services. When a plugin implements it,
+            it can be used by other plugins to obtain their configuration.
+        :param module_path: Path to module that includes all service clients.
+            All service client classes must be exposed by a single module.
+            If they are separated in different modules, defining __all__
+            in the root module can help, similar to what is done by service
+            clients in tempest.
+        :param client_names: List or set of names of service client classes.
+        :param kwargs: Extra optional parameters to be passed to all clients.
+            ServiceClient provides defaults for region, dscv, ca_certs and
+            trace_requests.
+        :raise ServiceClientRegistrationException: if the provided name is
+            already in use or if service_version is already registered.
+        :raise ImportError: if module_path cannot be imported.
+        """
+        if hasattr(self, name):
+            using_name = getattr(self, name)
+            detailed_error = 'Module name already in use: %s' % using_name
+            raise exceptions.ServiceClientRegistrationException(
+                name=name, service_version=service_version,
+                module_path=module_path, client_names=client_names,
+                detailed_error=detailed_error)
+        if service_version in self.registered_services:
+            detailed_error = 'Service %s already registered.' % service_version
+            raise exceptions.ServiceClientRegistrationException(
+                name=name, service_version=service_version,
+                module_path=module_path, client_names=client_names,
+                detailed_error=detailed_error)
+        params = dict(region=self.region,
+                      disable_ssl_certificate_validation=self.dscv,
+                      ca_certs=self.ca_certs,
+                      trace_requests=self.trace_requests)
+        params.update(kwargs)
+        # Instantiate the client factory
+        _factory = ClientsFactory(module_path=module_path,
+                                  client_names=client_names,
+                                  auth_provider=self.auth_provider,
+                                  **params)
+        # Adds the client factory to the service_client
+        setattr(self, name, _factory)
+        # Add the name of the new service in self.SERVICES for discovery
+        self._registered_services.add(service_version)
+
+    @property
+    def registered_services(self):
+        # TODO(andreaf) Temporary set needed until all services are migrated
+        _non_migrated_services = tempest_modules() - set(
+            client_modules_by_service_name)
+        return self._registered_services | _non_migrated_services
+
     def _setup_parameters(self, parameters):
         """Setup default values for client parameters
 
diff --git a/tempest/services/volume/base/admin/base_hosts_client.py b/tempest/services/volume/base/admin/base_hosts_client.py
deleted file mode 100644
index 382e9a8..0000000
--- a/tempest/services/volume/base/admin/base_hosts_client.py
+++ /dev/null
@@ -1,35 +0,0 @@
-# Copyright 2013 OpenStack Foundation
-# All Rights Reserved.
-#
-#    Licensed under the Apache License, Version 2.0 (the "License"); you may
-#    not use this file except in compliance with the License. You may obtain
-#    a copy of the License at
-#
-#         http://www.apache.org/licenses/LICENSE-2.0
-#
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#    License for the specific language governing permissions and limitations
-#    under the License.
-
-from oslo_serialization import jsonutils as json
-from six.moves.urllib import parse as urllib
-
-from tempest.lib.common import rest_client
-
-
-class BaseHostsClient(rest_client.RestClient):
-    """Client class to send CRUD Volume Hosts API requests"""
-
-    def list_hosts(self, **params):
-        """Lists all hosts."""
-
-        url = 'os-hosts'
-        if params:
-            url += '?%s' % urllib.urlencode(params)
-
-        resp, body = self.get(url)
-        body = json.loads(body)
-        self.expected_success(200, resp.status)
-        return rest_client.ResponseBody(resp, body)
diff --git a/tempest/services/volume/base/admin/base_services_client.py b/tempest/services/volume/base/admin/base_services_client.py
deleted file mode 100644
index 861eb92..0000000
--- a/tempest/services/volume/base/admin/base_services_client.py
+++ /dev/null
@@ -1,32 +0,0 @@
-# Copyright 2014 NEC Corporation
-# All Rights Reserved.
-#
-#    Licensed under the Apache License, Version 2.0 (the "License"); you may
-#    not use this file except in compliance with the License. You may obtain
-#    a copy of the License at
-#
-#         http://www.apache.org/licenses/LICENSE-2.0
-#
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#    License for the specific language governing permissions and limitations
-#    under the License.
-
-from oslo_serialization import jsonutils as json
-from six.moves.urllib import parse as urllib
-
-from tempest.lib.common import rest_client
-
-
-class BaseServicesClient(rest_client.RestClient):
-
-    def list_services(self, **params):
-        url = 'os-services'
-        if params:
-            url += '?%s' % urllib.urlencode(params)
-
-        resp, body = self.get(url)
-        body = json.loads(body)
-        self.expected_success(200, resp.status)
-        return rest_client.ResponseBody(resp, body)
diff --git a/tempest/services/volume/base/base_availability_zone_client.py b/tempest/services/volume/base/base_availability_zone_client.py
deleted file mode 100644
index 1c2deba..0000000
--- a/tempest/services/volume/base/base_availability_zone_client.py
+++ /dev/null
@@ -1,27 +0,0 @@
-# Copyright 2014 NEC Corporation.
-# All Rights Reserved.
-#
-#    Licensed under the Apache License, Version 2.0 (the "License"); you may
-#    not use this file except in compliance with the License. You may obtain
-#    a copy of the License at
-#
-#         http://www.apache.org/licenses/LICENSE-2.0
-#
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#    License for the specific language governing permissions and limitations
-#    under the License.
-
-from oslo_serialization import jsonutils as json
-
-from tempest.lib.common import rest_client
-
-
-class BaseAvailabilityZoneClient(rest_client.RestClient):
-
-    def list_availability_zones(self):
-        resp, body = self.get('os-availability-zone')
-        body = json.loads(body)
-        self.expected_success(200, resp.status)
-        return rest_client.ResponseBody(resp, body)
diff --git a/tempest/services/volume/base/base_backups_client.py b/tempest/services/volume/base/base_backups_client.py
index 3842d66..63c5417 100644
--- a/tempest/services/volume/base/base_backups_client.py
+++ b/tempest/services/volume/base/base_backups_client.py
@@ -89,6 +89,13 @@
         self.expected_success(201, resp.status)
         return rest_client.ResponseBody(resp, body)
 
+    def reset_backup_status(self, backup_id, status):
+        """Reset the specified backup's status."""
+        post_body = json.dumps({'os-reset_status': {"status": status}})
+        resp, body = self.post('backups/%s/action' % backup_id, post_body)
+        self.expected_success(202, resp.status)
+        return rest_client.ResponseBody(resp, body)
+
     def wait_for_backup_status(self, backup_id, status):
         """Waits for a Backup to reach a given status."""
         body = self.show_backup(backup_id)['backup']
@@ -99,7 +106,7 @@
             time.sleep(self.build_interval)
             body = self.show_backup(backup_id)['backup']
             backup_status = body['status']
-            if backup_status == 'error':
+            if backup_status == 'error' and backup_status != status:
                 raise exceptions.VolumeBackupException(backup_id=backup_id)
 
             if int(time.time()) - start >= self.build_timeout:
diff --git a/tempest/services/volume/base/base_extensions_client.py b/tempest/services/volume/base/base_extensions_client.py
deleted file mode 100644
index b90fe94..0000000
--- a/tempest/services/volume/base/base_extensions_client.py
+++ /dev/null
@@ -1,28 +0,0 @@
-# Copyright 2012 OpenStack Foundation
-# All Rights Reserved.
-#
-#    Licensed under the Apache License, Version 2.0 (the "License"); you may
-#    not use this file except in compliance with the License. You may obtain
-#    a copy of the License at
-#
-#         http://www.apache.org/licenses/LICENSE-2.0
-#
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#    License for the specific language governing permissions and limitations
-#    under the License.
-
-from oslo_serialization import jsonutils as json
-
-from tempest.lib.common import rest_client
-
-
-class BaseExtensionsClient(rest_client.RestClient):
-
-    def list_extensions(self):
-        url = 'extensions'
-        resp, body = self.get(url)
-        body = json.loads(body)
-        self.expected_success(200, resp.status)
-        return rest_client.ResponseBody(resp, body)
diff --git a/tempest/services/volume/v1/json/admin/hosts_client.py b/tempest/services/volume/v1/json/admin/hosts_client.py
index 3b52968..56ba12c 100644
--- a/tempest/services/volume/v1/json/admin/hosts_client.py
+++ b/tempest/services/volume/v1/json/admin/hosts_client.py
@@ -13,8 +13,23 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest.services.volume.base.admin import base_hosts_client
+from oslo_serialization import jsonutils as json
+from six.moves.urllib import parse as urllib
+
+from tempest.lib.common import rest_client
 
 
-class HostsClient(base_hosts_client.BaseHostsClient):
+class HostsClient(rest_client.RestClient):
     """Client class to send CRUD Volume Host API V1 requests"""
+
+    def list_hosts(self, **params):
+        """Lists all hosts."""
+
+        url = 'os-hosts'
+        if params:
+            url += '?%s' % urllib.urlencode(params)
+
+        resp, body = self.get(url)
+        body = json.loads(body)
+        self.expected_success(200, resp.status)
+        return rest_client.ResponseBody(resp, body)
diff --git a/tempest/services/volume/v1/json/admin/services_client.py b/tempest/services/volume/v1/json/admin/services_client.py
index 2bffd55..d438a34 100644
--- a/tempest/services/volume/v1/json/admin/services_client.py
+++ b/tempest/services/volume/v1/json/admin/services_client.py
@@ -13,8 +13,21 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest.services.volume.base.admin import base_services_client
+from oslo_serialization import jsonutils as json
+from six.moves.urllib import parse as urllib
+
+from tempest.lib.common import rest_client
 
 
-class ServicesClient(base_services_client.BaseServicesClient):
+class ServicesClient(rest_client.RestClient):
     """Volume V1 volume services client"""
+
+    def list_services(self, **params):
+        url = 'os-services'
+        if params:
+            url += '?%s' % urllib.urlencode(params)
+
+        resp, body = self.get(url)
+        body = json.loads(body)
+        self.expected_success(200, resp.status)
+        return rest_client.ResponseBody(resp, body)
diff --git a/tempest/services/volume/v1/json/availability_zone_client.py b/tempest/services/volume/v1/json/availability_zone_client.py
index 3a27027..be4f539 100644
--- a/tempest/services/volume/v1/json/availability_zone_client.py
+++ b/tempest/services/volume/v1/json/availability_zone_client.py
@@ -13,9 +13,16 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest.services.volume.base import base_availability_zone_client
+from oslo_serialization import jsonutils as json
+
+from tempest.lib.common import rest_client
 
 
-class AvailabilityZoneClient(
-        base_availability_zone_client.BaseAvailabilityZoneClient):
+class AvailabilityZoneClient(rest_client.RestClient):
     """Volume V1 availability zone client."""
+
+    def list_availability_zones(self):
+        resp, body = self.get('os-availability-zone')
+        body = json.loads(body)
+        self.expected_success(200, resp.status)
+        return rest_client.ResponseBody(resp, body)
diff --git a/tempest/services/volume/v1/json/extensions_client.py b/tempest/services/volume/v1/json/extensions_client.py
index f99d0f5..7b849a8 100644
--- a/tempest/services/volume/v1/json/extensions_client.py
+++ b/tempest/services/volume/v1/json/extensions_client.py
@@ -13,8 +13,17 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest.services.volume.base import base_extensions_client
+from oslo_serialization import jsonutils as json
+
+from tempest.lib.common import rest_client
 
 
-class ExtensionsClient(base_extensions_client.BaseExtensionsClient):
+class ExtensionsClient(rest_client.RestClient):
     """Volume V1 extensions client."""
+
+    def list_extensions(self):
+        url = 'extensions'
+        resp, body = self.get(url)
+        body = json.loads(body)
+        self.expected_success(200, resp.status)
+        return rest_client.ResponseBody(resp, body)
diff --git a/tempest/services/volume/v2/json/admin/hosts_client.py b/tempest/services/volume/v2/json/admin/hosts_client.py
index e092c6a..dd7c482 100644
--- a/tempest/services/volume/v2/json/admin/hosts_client.py
+++ b/tempest/services/volume/v2/json/admin/hosts_client.py
@@ -13,9 +13,24 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest.services.volume.base.admin import base_hosts_client
+from oslo_serialization import jsonutils as json
+from six.moves.urllib import parse as urllib
+
+from tempest.lib.common import rest_client
 
 
-class HostsClient(base_hosts_client.BaseHostsClient):
+class HostsClient(rest_client.RestClient):
     """Client class to send CRUD Volume V2 API requests"""
     api_version = "v2"
+
+    def list_hosts(self, **params):
+        """Lists all hosts."""
+
+        url = 'os-hosts'
+        if params:
+            url += '?%s' % urllib.urlencode(params)
+
+        resp, body = self.get(url)
+        body = json.loads(body)
+        self.expected_success(200, resp.status)
+        return rest_client.ResponseBody(resp, body)
diff --git a/tempest/services/volume/v2/json/admin/services_client.py b/tempest/services/volume/v2/json/admin/services_client.py
index db19ba9..bc55469 100644
--- a/tempest/services/volume/v2/json/admin/services_client.py
+++ b/tempest/services/volume/v2/json/admin/services_client.py
@@ -13,9 +13,22 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest.services.volume.base.admin import base_services_client
+from oslo_serialization import jsonutils as json
+from six.moves.urllib import parse as urllib
+
+from tempest.lib.common import rest_client
 
 
-class ServicesClient(base_services_client.BaseServicesClient):
+class ServicesClient(rest_client.RestClient):
     """Client class to send CRUD Volume V2 API requests"""
     api_version = "v2"
+
+    def list_services(self, **params):
+        url = 'os-services'
+        if params:
+            url += '?%s' % urllib.urlencode(params)
+
+        resp, body = self.get(url)
+        body = json.loads(body)
+        self.expected_success(200, resp.status)
+        return rest_client.ResponseBody(resp, body)
diff --git a/tempest/services/volume/v2/json/availability_zone_client.py b/tempest/services/volume/v2/json/availability_zone_client.py
index 905ebdc..bb4a357 100644
--- a/tempest/services/volume/v2/json/availability_zone_client.py
+++ b/tempest/services/volume/v2/json/availability_zone_client.py
@@ -13,9 +13,16 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest.services.volume.base import base_availability_zone_client
+from oslo_serialization import jsonutils as json
+
+from tempest.lib.common import rest_client
 
 
-class AvailabilityZoneClient(
-        base_availability_zone_client.BaseAvailabilityZoneClient):
+class AvailabilityZoneClient(rest_client.RestClient):
     api_version = "v2"
+
+    def list_availability_zones(self):
+        resp, body = self.get('os-availability-zone')
+        body = json.loads(body)
+        self.expected_success(200, resp.status)
+        return rest_client.ResponseBody(resp, body)
diff --git a/tempest/services/volume/v2/json/extensions_client.py b/tempest/services/volume/v2/json/extensions_client.py
index 245906f..09279d5 100644
--- a/tempest/services/volume/v2/json/extensions_client.py
+++ b/tempest/services/volume/v2/json/extensions_client.py
@@ -13,8 +13,18 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest.services.volume.base import base_extensions_client
+from oslo_serialization import jsonutils as json
+
+from tempest.lib.common import rest_client
 
 
-class ExtensionsClient(base_extensions_client.BaseExtensionsClient):
+class ExtensionsClient(rest_client.RestClient):
+    """Volume V2 extensions client."""
     api_version = "v2"
+
+    def list_extensions(self):
+        url = 'extensions'
+        resp, body = self.get(url)
+        body = json.loads(body)
+        self.expected_success(200, resp.status)
+        return rest_client.ResponseBody(resp, body)
diff --git a/tempest/test_discover/plugins.py b/tempest/test_discover/plugins.py
index d604b28..cfb0c7f 100644
--- a/tempest/test_discover/plugins.py
+++ b/tempest/test_discover/plugins.py
@@ -19,6 +19,7 @@
 import stevedore
 
 from tempest.lib.common.utils import misc
+from tempest.lib.services import clients
 
 LOG = logging.getLogger(__name__)
 
@@ -62,6 +63,54 @@
         """
         return []
 
+    def get_service_clients(self):
+        """Get a list of the service clients for registration
+
+        If the plugin implements service clients for one or more APIs, it
+        may return their details by this method for automatic registration
+        in any ServiceClients object instantiated by tests.
+        The default implementation returns an empty list.
+
+        :return list of dictionaries. Each element of the list represents
+            the service client for an API. Each dict must define all
+            parameters required for the invocation of
+            `service_clients.ServiceClients.register_service_client_module`.
+        :rtype: list
+
+        Example:
+
+            >>>  # Example implementation with one service client
+            >>>  myservice_config = config.service_client_config('myservice')
+            >>>  params = {
+            >>>     'name': 'myservice',
+            >>>     'service_version': 'myservice',
+            >>>     'module_path': 'myservice_tempest_tests.services',
+            >>>     'client_names': ['API1Client', 'API2Client'],
+            >>>  }
+            >>>  params.update(myservice_config)
+            >>> return [params]
+
+            >>>  # Example implementation with two service clients
+            >>>  foo1_config = config.service_client_config('foo')
+            >>>  params_foo1 = {
+            >>>     'name': 'foo_v1',
+            >>>     'service_version': 'foo.v1',
+            >>>     'module_path': 'bar_tempest_tests.services.foo.v1',
+            >>>     'client_names': ['API1Client', 'API2Client'],
+            >>>  }
+            >>>  params_foo1.update(foo_config)
+            >>>  foo2_config = config.service_client_config('foo')
+            >>>  params_foo2 = {
+            >>>     'name': 'foo_v2',
+            >>>     'service_version': 'foo.v2',
+            >>>     'module_path': 'bar_tempest_tests.services.foo.v2',
+            >>>     'client_names': ['API1Client', 'API2Client'],
+            >>>  }
+            >>>  params_foo2.update(foo2_config)
+            >>> return [params_foo1, params_foo2]
+        """
+        return []
+
 
 @misc.singleton
 class TempestTestPluginManager(object):
@@ -75,6 +124,7 @@
             'tempest.test_plugins', invoke_on_load=True,
             propagate_map_exceptions=True,
             on_load_failure_callback=self.failure_hook)
+        self._register_service_clients()
 
     @staticmethod
     def failure_hook(_, ep, err):
@@ -102,3 +152,13 @@
             if opt_list:
                 plugin_options.extend(opt_list)
         return plugin_options
+
+    def _register_service_clients(self):
+        registry = clients.ClientsRegistry()
+        for plug in self.ext_plugins:
+            try:
+                registry.register_service_client(
+                    plug.name, plug.obj.get_service_clients())
+            except Exception:
+                LOG.exception('Plugin %s raised an exception trying to run '
+                              'get_service_clients' % plug.name)
diff --git a/tempest/tests/cmd/test_subunit_describe_calls.py b/tempest/tests/cmd/test_subunit_describe_calls.py
index 43b417a..1c24c37 100644
--- a/tempest/tests/cmd/test_subunit_describe_calls.py
+++ b/tempest/tests/cmd/test_subunit_describe_calls.py
@@ -38,46 +38,159 @@
             os.path.dirname(os.path.abspath(__file__)),
             'sample_streams/calls.subunit')
         parser = subunit_describe_calls.parse(
-            subunit_file, "pythonlogging", None)
+            open(subunit_file), "pythonlogging", None)
         expected_result = {
-            'bar': [{'name': 'AgentsAdminTestJSON:setUp',
-                     'service': 'Nova',
-                     'status_code': '200',
-                     'url': 'v2.1/<id>/os-agents',
-                     'verb': 'POST'},
-                    {'name': 'AgentsAdminTestJSON:test_create_agent',
-                     'service': 'Nova',
-                     'status_code': '200',
-                     'url': 'v2.1/<id>/os-agents',
-                     'verb': 'POST'},
-                    {'name': 'AgentsAdminTestJSON:tearDown',
-                     'service': 'Nova',
-                     'status_code': '200',
-                     'url': 'v2.1/<id>/os-agents/1',
-                     'verb': 'DELETE'},
-                    {'name': 'AgentsAdminTestJSON:_run_cleanups',
-                     'service': 'Nova',
-                     'status_code': '200',
-                     'url': 'v2.1/<id>/os-agents/2',
-                     'verb': 'DELETE'}],
-            'foo': [{'name': 'AgentsAdminTestJSON:setUp',
-                     'service': 'Nova',
-                     'status_code': '200',
-                     'url': 'v2.1/<id>/os-agents',
-                     'verb': 'POST'},
-                    {'name': 'AgentsAdminTestJSON:test_delete_agent',
-                     'service': 'Nova',
-                     'status_code': '200',
-                     'url': 'v2.1/<id>/os-agents/3',
-                     'verb': 'DELETE'},
-                    {'name': 'AgentsAdminTestJSON:test_delete_agent',
-                     'service': 'Nova',
-                     'status_code': '200',
-                     'url': 'v2.1/<id>/os-agents',
-                     'verb': 'GET'},
-                    {'name': 'AgentsAdminTestJSON:tearDown',
-                     'service': 'Nova',
-                     'status_code': '404',
-                     'url': 'v2.1/<id>/os-agents/3',
-                     'verb': 'DELETE'}]}
+            'bar': [{
+                'name': 'AgentsAdminTestJSON:setUp',
+                'request_body': '{"agent": {"url": "xxx://xxxx/xxx/xxx", '
+                '"hypervisor": "common", "md5hash": '
+                '"add6bb58e139be103324d04d82d8f545", "version": "7.0", '
+                '"architecture": "tempest-x86_64-424013832", "os": "linux"}}',
+                'request_headers': "{'Content-Type': 'application/json', "
+                "'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
+                'response_body': '{"agent": {"url": "xxx://xxxx/xxx/xxx", '
+                '"hypervisor": "common", "md5hash": '
+                '"add6bb58e139be103324d04d82d8f545", "version": "7.0", '
+                '"architecture": "tempest-x86_64-424013832", "os": "linux", '
+                '"agent_id": 1}}',
+                'response_headers': "{'status': '200', 'content-length': "
+                "'203', 'x-compute-request-id': "
+                "'req-25ddaae2-0ef1-40d1-8228-59bd64a7e75b', 'vary': "
+                "'X-OpenStack-Nova-API-Version', 'connection': 'close', "
+                "'x-openstack-nova-api-version': '2.1', 'date': "
+                "'Tue, 02 Feb 2016 03:27:00 GMT', 'content-type': "
+                "'application/json'}",
+                'service': 'Nova',
+                'status_code': '200',
+                'url': 'v2.1/<id>/os-agents',
+                'verb': 'POST'}, {
+                'name': 'AgentsAdminTestJSON:test_create_agent',
+                'request_body': '{"agent": {"url": "xxx://xxxx/xxx/xxx", '
+                '"hypervisor": "kvm", "md5hash": '
+                '"add6bb58e139be103324d04d82d8f545", "version": "7.0", '
+                '"architecture": "tempest-x86-252246646", "os": "win"}}',
+                'request_headers': "{'Content-Type': 'application/json', "
+                "'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
+                'response_body': '{"agent": {"url": "xxx://xxxx/xxx/xxx", '
+                '"hypervisor": "kvm", "md5hash": '
+                '"add6bb58e139be103324d04d82d8f545", "version": "7.0", '
+                '"architecture": "tempest-x86-252246646", "os": "win", '
+                '"agent_id": 2}}',
+                'response_headers': "{'status': '200', 'content-length': "
+                "'195', 'x-compute-request-id': "
+                "'req-b4136f06-c015-4e7e-995f-c43831e3ecce', 'vary': "
+                "'X-OpenStack-Nova-API-Version', 'connection': 'close', "
+                "'x-openstack-nova-api-version': '2.1', 'date': "
+                "'Tue, 02 Feb 2016 03:27:00 GMT', 'content-type': "
+                "'application/json'}",
+                'service': 'Nova',
+                'status_code': '200',
+                'url': 'v2.1/<id>/os-agents',
+                'verb': 'POST'}, {
+                'name': 'AgentsAdminTestJSON:tearDown',
+                'request_body': 'None',
+                'request_headers': "{'Content-Type': 'application/json', "
+                "'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
+                'response_body': '',
+                'response_headers': "{'status': '200', 'content-length': "
+                "'0', 'x-compute-request-id': "
+                "'req-ee905fd6-a5b5-4da4-8c37-5363cb25bd9d', 'vary': "
+                "'X-OpenStack-Nova-API-Version', 'connection': 'close', "
+                "'x-openstack-nova-api-version': '2.1', 'date': "
+                "'Tue, 02 Feb 2016 03:27:00 GMT', 'content-type': "
+                "'application/json'}",
+                'service': 'Nova',
+                'status_code': '200',
+                'url': 'v2.1/<id>/os-agents/1',
+                'verb': 'DELETE'}, {
+                'name': 'AgentsAdminTestJSON:_run_cleanups',
+                'request_body': 'None',
+                'request_headers': "{'Content-Type': 'application/json', "
+                "'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
+                'response_headers': "{'status': '200', 'content-length': "
+                "'0', 'x-compute-request-id': "
+                "'req-e912cac0-63e0-4679-a68a-b6d18ddca074', 'vary': "
+                "'X-OpenStack-Nova-API-Version', 'connection': 'close', "
+                "'x-openstack-nova-api-version': '2.1', 'date': "
+                "'Tue, 02 Feb 2016 03:27:00 GMT', 'content-type': "
+                "'application/json'}",
+                'service': 'Nova',
+                'status_code': '200',
+                'url': 'v2.1/<id>/os-agents/2',
+                'verb': 'DELETE'}],
+            'foo': [{
+                'name': 'AgentsAdminTestJSON:setUp',
+                'request_body': '{"agent": {"url": "xxx://xxxx/xxx/xxx", '
+                '"hypervisor": "common", "md5hash": '
+                '"add6bb58e139be103324d04d82d8f545", "version": "7.0", '
+                '"architecture": "tempest-x86_64-948635295", "os": "linux"}}',
+                'request_headers': "{'Content-Type': 'application/json', "
+                "'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
+                'response_body': '{"agent": {"url": "xxx://xxxx/xxx/xxx", '
+                '"hypervisor": "common", "md5hash": '
+                '"add6bb58e139be103324d04d82d8f545", "version": "7.0", '
+                '"architecture": "tempest-x86_64-948635295", "os": "linux", '
+                '"agent_id": 3}}',
+                'response_headers': "{'status': '200', 'content-length': "
+                "'203', 'x-compute-request-id': "
+                "'req-ccd2116d-04b1-4ffe-ae32-fb623f68bf1c', 'vary': "
+                "'X-OpenStack-Nova-API-Version', 'connection': 'close', "
+                "'x-openstack-nova-api-version': '2.1', 'date': "
+                "'Tue, 02 Feb 2016 03:27:01 GMT', 'content-type': "
+                "'application/json'}",
+                'service': 'Nova',
+                'status_code': '200',
+                'url': 'v2.1/<id>/os-agents',
+                'verb': 'POST'}, {
+                'name': 'AgentsAdminTestJSON:test_delete_agent',
+                'request_body': 'None',
+                'request_headers': "{'Content-Type': 'application/json', "
+                "'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
+                'response_body': '',
+                'response_headers': "{'status': '200', 'content-length': "
+                "'0', 'x-compute-request-id': "
+                "'req-6e7fa28f-ae61-4388-9a78-947c58bc0588', 'vary': "
+                "'X-OpenStack-Nova-API-Version', 'connection': 'close', "
+                "'x-openstack-nova-api-version': '2.1', 'date': "
+                "'Tue, 02 Feb 2016 03:27:01 GMT', 'content-type': "
+                "'application/json'}",
+                'service': 'Nova',
+                'status_code': '200',
+                'url': 'v2.1/<id>/os-agents/3',
+                'verb': 'DELETE'}, {
+                'name': 'AgentsAdminTestJSON:test_delete_agent',
+                'request_body': 'None',
+                'request_headers': "{'Content-Type': 'application/json', "
+                "'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
+                'response_body': '{"agents": []}',
+                'response_headers': "{'status': '200', 'content-length': "
+                "'14', 'content-location': "
+                "'http://23.253.76.97:8774/v2.1/"
+                "cf6b1933fe5b476fbbabb876f6d1b924/os-agents', "
+                "'x-compute-request-id': "
+                "'req-e41aa9b4-41a6-4138-ae04-220b768eb644', 'vary': "
+                "'X-OpenStack-Nova-API-Version', 'connection': 'close', "
+                "'x-openstack-nova-api-version': '2.1', 'date': "
+                "'Tue, 02 Feb 2016 03:27:01 GMT', 'content-type': "
+                "'application/json'}",
+                'service': 'Nova',
+                'status_code': '200',
+                'url': 'v2.1/<id>/os-agents',
+                'verb': 'GET'}, {
+                'name': 'AgentsAdminTestJSON:tearDown',
+                'request_body': 'None',
+                'request_headers': "{'Content-Type': 'application/json', "
+                "'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}",
+                'response_headers': "{'status': '404', 'content-length': "
+                "'82', 'x-compute-request-id': "
+                "'req-e297aeea-91cf-4f26-b49c-8f46b1b7a926', 'vary': "
+                "'X-OpenStack-Nova-API-Version', 'connection': 'close', "
+                "'x-openstack-nova-api-version': '2.1', 'date': "
+                "'Tue, 02 Feb 2016 03:27:02 GMT', 'content-type': "
+                "'application/json; charset=UTF-8'}",
+                'service': 'Nova',
+                'status_code': '404',
+                'url': 'v2.1/<id>/os-agents/3',
+                'verb': 'DELETE'}]}
+
         self.assertEqual(expected_result, parser.test_logs)
diff --git a/tempest/tests/fake_tempest_plugin.py b/tempest/tests/fake_tempest_plugin.py
index f718d0b..56aae1e 100644
--- a/tempest/tests/fake_tempest_plugin.py
+++ b/tempest/tests/fake_tempest_plugin.py
@@ -18,6 +18,7 @@
 
 class FakePlugin(plugins.TempestPlugin):
     expected_load_test = ["my/test/path", "/home/dir"]
+    expected_service_clients = [{'foo': 'bar'}]
 
     def load_tests(self):
         return self.expected_load_test
@@ -28,6 +29,9 @@
     def get_opt_lists(self):
         return []
 
+    def get_service_clients(self):
+        return self.expected_service_clients
+
 
 class FakeStevedoreObj(object):
     obj = FakePlugin()
@@ -38,3 +42,26 @@
 
     def __init__(self, name='Test1'):
         self._name = name
+
+
+class FakePluginNoServiceClients(plugins.TempestPlugin):
+
+    def load_tests(self):
+        return []
+
+    def register_opts(self, conf):
+        return
+
+    def get_opt_lists(self):
+        return []
+
+
+class FakeStevedoreObjNoServiceClients(object):
+    obj = FakePluginNoServiceClients()
+
+    @property
+    def name(self):
+        return self._name
+
+    def __init__(self, name='Test2'):
+        self._name = name
diff --git a/tempest/tests/lib/test_auth.py b/tempest/tests/lib/test_auth.py
index 12590a3..6da7e41 100644
--- a/tempest/tests/lib/test_auth.py
+++ b/tempest/tests/lib/test_auth.py
@@ -244,7 +244,7 @@
         # The original headers where empty
         self.assertNotEqual(url, self.target_url)
         self.assertIsNone(headers)
-        self.assertEqual(body, None)
+        self.assertIsNone(body)
 
     def _test_request_with_alt_part_without_alt_data_no_change(self, body):
         """Test empty alternate auth data with no effect
diff --git a/tempest/tests/negative/test_negative_generators.py b/tempest/tests/negative/test_negative_generators.py
index 78fd80d..2e45ef7 100644
--- a/tempest/tests/negative/test_negative_generators.py
+++ b/tempest/tests/negative/test_negative_generators.py
@@ -146,5 +146,5 @@
             schema_under_test = copy.copy(valid_schema)
             expected_result = \
                 self.generator.generate_payload(test, schema_under_test)
-            self.assertEqual(expected_result, None)
+            self.assertIsNone(expected_result)
             self._validate_result(valid_schema, schema_under_test)
diff --git a/tempest/tests/test_service_clients.py b/tempest/tests/test_service_clients.py
index a559086..3d8b360 100644
--- a/tempest/tests/test_service_clients.py
+++ b/tempest/tests/test_service_clients.py
@@ -13,15 +13,154 @@
 # the License.
 
 import fixtures
+import mock
 import testtools
+import types
 
 from tempest.lib import auth
 from tempest.lib import exceptions
 from tempest import service_clients
 from tempest.tests import base
+from tempest.tests.lib import fake_auth_provider
 from tempest.tests.lib import fake_credentials
 
 
+has_attribute = testtools.matchers.MatchesPredicateWithParams(
+    lambda x, y: hasattr(x, y), '{0} does not have an attribute {1}')
+
+
+class TestClientsFactory(base.TestCase):
+
+    def setUp(self):
+        super(TestClientsFactory, self).setUp()
+        self.classes = []
+
+    def _setup_fake_module(self, class_names=None, extra_dict=None):
+        class_names = class_names or []
+        fake_module = types.ModuleType('fake_service_client')
+        _dict = {}
+        # Add fake classes to the fake module
+        for name in class_names:
+            _dict[name] = type(name, (object,), {})
+            # Store it for assertions
+            self.classes.append(_dict[name])
+        if extra_dict:
+            _dict[extra_dict] = extra_dict
+        fake_module.__dict__.update(_dict)
+        fixture_importlib = self.useFixture(fixtures.MockPatch(
+            'importlib.import_module', return_value=fake_module))
+        return fixture_importlib.mock
+
+    def test___init___one_class(self):
+        fake_partial = 'fake_partial'
+        partial_mock = self.useFixture(fixtures.MockPatch(
+            'tempest.service_clients.ClientsFactory._get_partial_class',
+            return_value=fake_partial)).mock
+        class_names = ['FakeServiceClient1']
+        mock_importlib = self._setup_fake_module(class_names=class_names)
+        auth_provider = fake_auth_provider.FakeAuthProvider()
+        params = {'k1': 'v1', 'k2': 'v2'}
+        factory = service_clients.ClientsFactory('fake_path', class_names,
+                                                 auth_provider, **params)
+        # Assert module has been imported
+        mock_importlib.assert_called_once_with('fake_path')
+        # All attributes have been created
+        for client in class_names:
+            self.assertThat(factory, has_attribute(client))
+        # Partial have been invoked correctly
+        partial_mock.assert_called_once_with(
+            self.classes[0], auth_provider, params)
+        # Get the clients
+        for name in class_names:
+            self.assertEqual(fake_partial, getattr(factory, name))
+
+    def test___init___two_classes(self):
+        fake_partial = 'fake_partial'
+        partial_mock = self.useFixture(fixtures.MockPatch(
+            'tempest.service_clients.ClientsFactory._get_partial_class',
+            return_value=fake_partial)).mock
+        class_names = ['FakeServiceClient1', 'FakeServiceClient2']
+        mock_importlib = self._setup_fake_module(class_names=class_names)
+        auth_provider = fake_auth_provider.FakeAuthProvider()
+        params = {'k1': 'v1', 'k2': 'v2'}
+        factory = service_clients.ClientsFactory('fake_path', class_names,
+                                                 auth_provider, **params)
+        # Assert module has been imported
+        mock_importlib.assert_called_once_with('fake_path')
+        # All attributes have been created
+        for client in class_names:
+            self.assertThat(factory, has_attribute(client))
+        # Partial have been invoked the right number of times
+        partial_mock.call_count = len(class_names)
+        # Get the clients
+        for name in class_names:
+            self.assertEqual(fake_partial, getattr(factory, name))
+
+    def test___init___no_module(self):
+        auth_provider = fake_auth_provider.FakeAuthProvider()
+        class_names = ['FakeServiceClient1', 'FakeServiceClient2']
+        with testtools.ExpectedException(ImportError, '.*fake_module.*'):
+            service_clients.ClientsFactory('fake_module', class_names,
+                                           auth_provider)
+
+    def test___init___not_a_class(self):
+        class_names = ['FakeServiceClient1', 'FakeServiceClient2']
+        extended_class_names = class_names + ['not_really_a_class']
+        self._setup_fake_module(
+            class_names=class_names, extra_dict='not_really_a_class')
+        auth_provider = fake_auth_provider.FakeAuthProvider()
+        expected_msg = '.*not_really_a_class.*str.*'
+        with testtools.ExpectedException(TypeError, expected_msg):
+            service_clients.ClientsFactory('fake_module', extended_class_names,
+                                           auth_provider)
+
+    def test___init___class_not_found(self):
+        class_names = ['FakeServiceClient1', 'FakeServiceClient2']
+        extended_class_names = class_names + ['not_really_a_class']
+        self._setup_fake_module(class_names=class_names)
+        auth_provider = fake_auth_provider.FakeAuthProvider()
+        expected_msg = '.*not_really_a_class.*fake_service_client.*'
+        with testtools.ExpectedException(AttributeError, expected_msg):
+            service_clients.ClientsFactory('fake_module', extended_class_names,
+                                           auth_provider)
+
+    def test__get_partial_class_no_later_kwargs(self):
+        expected_fake_client = 'not_really_a_client'
+        self._setup_fake_module(class_names=[])
+        auth_provider = fake_auth_provider.FakeAuthProvider()
+        params = {'k1': 'v1', 'k2': 'v2'}
+        factory = service_clients.ClientsFactory(
+            'fake_path', [], auth_provider, **params)
+        klass_mock = mock.Mock(return_value=expected_fake_client)
+        partial = factory._get_partial_class(klass_mock, auth_provider, params)
+        # Class has not be initialised yet
+        klass_mock.assert_not_called()
+        # Use partial and assert on parameters
+        client = partial()
+        self.assertEqual(expected_fake_client, client)
+        klass_mock.assert_called_once_with(auth_provider=auth_provider,
+                                           **params)
+
+    def test__get_partial_class_later_kwargs(self):
+        expected_fake_client = 'not_really_a_client'
+        self._setup_fake_module(class_names=[])
+        auth_provider = fake_auth_provider.FakeAuthProvider()
+        params = {'k1': 'v1', 'k2': 'v2'}
+        later_params = {'k2': 'v4', 'k3': 'v3'}
+        factory = service_clients.ClientsFactory(
+            'fake_path', [], auth_provider, **params)
+        klass_mock = mock.Mock(return_value=expected_fake_client)
+        partial = factory._get_partial_class(klass_mock, auth_provider, params)
+        # Class has not be initialised yet
+        klass_mock.assert_not_called()
+        # Use partial and assert on parameters
+        client = partial(**later_params)
+        params.update(later_params)
+        self.assertEqual(expected_fake_client, client)
+        klass_mock.assert_called_once_with(auth_provider=auth_provider,
+                                           **params)
+
+
 class TestServiceClients(base.TestCase):
 
     def setUp(self):
@@ -124,3 +263,84 @@
         for _key in _params.keys():
             self.assertEqual(expected_params[_key],
                              _params[_key])
+
+    def test_register_service_client_module(self):
+        expected_params = {'fake_param1': 'fake_value1',
+                           'fake_param2': 'fake_value2'}
+        _manager = self._get_manager(init_region='fake_region_default')
+        # Mock after the _manager is setup to preserve the call count
+        factory_mock = self.useFixture(fixtures.MockPatch(
+            'tempest.service_clients.ClientsFactory')).mock
+        _manager.register_service_client_module(
+            name='fake_module',
+            service_version='fake_service',
+            module_path='fake.path.to.module',
+            client_names=[],
+            **expected_params)
+        self.assertThat(_manager, has_attribute('fake_module'))
+        # Assert called once, without check for exact parameters
+        self.assertTrue(factory_mock.called)
+        self.assertEqual(1, factory_mock.call_count)
+        # Assert expected params are in with their values
+        actual_kwargs = factory_mock.call_args[1]
+        self.assertIn('region', actual_kwargs)
+        self.assertEqual('fake_region_default', actual_kwargs['region'])
+        for param in expected_params:
+            self.assertIn(param, actual_kwargs)
+            self.assertEqual(expected_params[param], actual_kwargs[param])
+        # Assert the new service is registered
+        self.assertIn('fake_service', _manager._registered_services)
+
+    def test_register_service_client_module_override_default(self):
+        new_region = 'new_region'
+        expected_params = {'fake_param1': 'fake_value1',
+                           'fake_param2': 'fake_value2',
+                           'region': new_region}
+        _manager = self._get_manager(init_region='fake_region_default')
+        # Mock after the _manager is setup to preserve the call count
+        factory_mock = self.useFixture(fixtures.MockPatch(
+            'tempest.service_clients.ClientsFactory')).mock
+        _manager.register_service_client_module(
+            name='fake_module',
+            service_version='fake_service',
+            module_path='fake.path.to.module',
+            client_names=[],
+            **expected_params)
+        self.assertThat(_manager, has_attribute('fake_module'))
+        # Assert called once, without check for exact parameters
+        self.assertTrue(factory_mock.called)
+        self.assertEqual(1, factory_mock.call_count)
+        # Assert expected params are in with their values
+        actual_kwargs = factory_mock.call_args[1]
+        self.assertIn('region', actual_kwargs)
+        self.assertEqual(new_region, actual_kwargs['region'])
+        for param in expected_params:
+            self.assertIn(param, actual_kwargs)
+            self.assertEqual(expected_params[param], actual_kwargs[param])
+        # Assert the new service is registered
+        self.assertIn('fake_service', _manager._registered_services)
+
+    def test_register_service_client_module_duplicate_name(self):
+        self.useFixture(fixtures.MockPatch(
+            'tempest.service_clients.ClientsFactory'))
+        _manager = self._get_manager()
+        name_owner = 'this_is_a_string'
+        setattr(_manager, 'fake_module', name_owner)
+        expected_error = '.*' + name_owner
+        with testtools.ExpectedException(
+                exceptions.ServiceClientRegistrationException, expected_error):
+            _manager.register_service_client_module(
+                name='fake_module', module_path='fake.path.to.module',
+                service_version='fake_service', client_names=[])
+
+    def test_register_service_client_module_duplicate_service(self):
+        self.useFixture(fixtures.MockPatch(
+            'tempest.service_clients.ClientsFactory'))
+        _manager = self._get_manager()
+        duplicate_service = 'fake_service1'
+        expected_error = '.*' + duplicate_service
+        with testtools.ExpectedException(
+                exceptions.ServiceClientRegistrationException, expected_error):
+            _manager.register_service_client_module(
+                name='fake_module', module_path='fake.path.to.module',
+                service_version=duplicate_service, client_names=[])
diff --git a/tempest/tests/test_tempest_plugin.py b/tempest/tests/test_tempest_plugin.py
index c07e98c..dd50125 100644
--- a/tempest/tests/test_tempest_plugin.py
+++ b/tempest/tests/test_tempest_plugin.py
@@ -13,6 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from tempest.lib.services import clients
 from tempest.test_discover import plugins
 from tempest.tests import base
 from tempest.tests import fake_tempest_plugin as fake_plugin
@@ -42,3 +43,39 @@
                          result['fake01'])
         self.assertEqual(fake_plugin.FakePlugin.expected_load_test,
                          result['fake02'])
+
+    def test__register_service_clients_with_one_plugin(self):
+        registry = clients.ClientsRegistry()
+        manager = plugins.TempestTestPluginManager()
+        fake_obj = fake_plugin.FakeStevedoreObj()
+        manager.ext_plugins = [fake_obj]
+        manager._register_service_clients()
+        expected_result = fake_plugin.FakePlugin.expected_service_clients
+        registered_clients = registry.get_service_clients()
+        self.assertIn(fake_obj.name, registered_clients)
+        self.assertEqual(expected_result, registered_clients[fake_obj.name])
+
+    def test__get_service_clients_with_two_plugins(self):
+        registry = clients.ClientsRegistry()
+        manager = plugins.TempestTestPluginManager()
+        obj1 = fake_plugin.FakeStevedoreObj('fake01')
+        obj2 = fake_plugin.FakeStevedoreObj('fake02')
+        manager.ext_plugins = [obj1, obj2]
+        manager._register_service_clients()
+        expected_result = fake_plugin.FakePlugin.expected_service_clients
+        registered_clients = registry.get_service_clients()
+        self.assertIn('fake01', registered_clients)
+        self.assertIn('fake02', registered_clients)
+        self.assertEqual(expected_result, registered_clients['fake01'])
+        self.assertEqual(expected_result, registered_clients['fake02'])
+
+    def test__register_service_clients_one_plugin_no_service_clients(self):
+        registry = clients.ClientsRegistry()
+        manager = plugins.TempestTestPluginManager()
+        fake_obj = fake_plugin.FakeStevedoreObjNoServiceClients()
+        manager.ext_plugins = [fake_obj]
+        manager._register_service_clients()
+        expected_result = []
+        registered_clients = registry.get_service_clients()
+        self.assertIn(fake_obj.name, registered_clients)
+        self.assertEqual(expected_result, registered_clients[fake_obj.name])