diff --git a/etc/tempest.conf.sample b/etc/tempest.conf.sample
index 4a567e7..70950b7 100644
--- a/etc/tempest.conf.sample
+++ b/etc/tempest.conf.sample
@@ -350,6 +350,10 @@
 # API key to use when authenticating as admin. (string value)
 #password=<None>
 
+# Domain name for authentication as admin (Keystone V3).The
+# same domain applies to user and project (string value)
+#domain_name=<None>
+
 
 [compute-feature-enabled]
 
@@ -516,6 +520,10 @@
 # API key to use when authenticating. (string value)
 #password=<None>
 
+# Domain name for authentication (Keystone V3).The same domain
+# applies to user and project (string value)
+#domain_name=<None>
+
 # Username of alternate user to use for Nova API requests.
 # (string value)
 #alt_username=<None>
@@ -528,6 +536,10 @@
 # (string value)
 #alt_password=<None>
 
+# Alternate domain name for authentication (Keystone V3).The
+# same domain applies to user and project (string value)
+#alt_domain_name=<None>
+
 # Administrative Username to use for Keystone API requests.
 # (string value)
 #admin_username=<None>
@@ -539,6 +551,10 @@
 # API key to use when authenticating as admin. (string value)
 #admin_password=<None>
 
+# Admin domain name for authentication (Keystone V3).The same
+# domain applies to user and project (string value)
+#admin_domain_name=<None>
+
 
 [identity-feature-enabled]
 
diff --git a/tempest/auth.py b/tempest/auth.py
index ac8cbd1..9c51edb 100644
--- a/tempest/auth.py
+++ b/tempest/auth.py
@@ -80,6 +80,17 @@
     def _get_auth(self):
         raise NotImplementedError
 
+    def _fill_credentials(self, auth_data_body):
+        raise NotImplementedError
+
+    def fill_credentials(self):
+        """
+        Fill credentials object with data from auth
+        """
+        auth_data = self.get_auth()
+        self._fill_credentials(auth_data[1])
+        return self.credentials
+
     @classmethod
     def check_credentials(cls, credentials):
         """
@@ -89,20 +100,35 @@
 
     @property
     def auth_data(self):
-        if self.cache is None or self.is_expired(self.cache):
-            self.cache = self._get_auth()
-        return self.cache
+        return self.get_auth()
 
     @auth_data.deleter
     def auth_data(self):
         self.clear_auth()
 
+    def get_auth(self):
+        """
+        Returns auth from cache if available, else auth first
+        """
+        if self.cache is None or self.is_expired(self.cache):
+            self.set_auth()
+        return self.cache
+
+    def set_auth(self):
+        """
+        Forces setting auth, ignores cache if it exists.
+        Refills credentials
+        """
+        self.cache = self._get_auth()
+        self._fill_credentials(self.cache[1])
+
     def clear_auth(self):
         """
         Can be called to clear the access cache so that next request
         will fetch a new token and base_url.
         """
         self.cache = None
+        self.credentials.reset()
 
     def is_expired(self, auth_data):
         raise NotImplementedError
@@ -244,6 +270,18 @@
         else:
             raise NotImplementedError
 
+    def _fill_credentials(self, auth_data_body):
+        tenant = auth_data_body['token']['tenant']
+        user = auth_data_body['user']
+        if self.credentials.tenant_name is None:
+            self.credentials.tenant_name = tenant['name']
+        if self.credentials.tenant_id is None:
+            self.credentials.tenant_id = tenant['id']
+        if self.credentials.username is None:
+            self.credentials.username = user['name']
+        if self.credentials.user_id is None:
+            self.credentials.user_id = user['id']
+
     def base_url(self, filters, auth_data=None):
         """
         Filters can be:
@@ -300,19 +338,6 @@
 
     EXPIRY_DATE_FORMAT = '%Y-%m-%dT%H:%M:%S.%fZ'
 
-    def _convert_credentials(self, credentials):
-        # For V3 do not convert as V3 Credentials are not defined yet
-        return credentials
-
-    @classmethod
-    def check_credentials(cls, credentials, scoped=True):
-        # tenant_name is optional if not scoped
-        valid = 'username' in credentials and 'password' in credentials \
-            and 'domain_name' in credentials
-        if scoped:
-            valid = valid and 'tenant_name' in credentials
-        return valid
-
     def _auth_client(self):
         if self.client_type == 'tempest':
             if self.interface == 'json':
@@ -325,14 +350,47 @@
     def _auth_params(self):
         if self.client_type == 'tempest':
             return dict(
-                user=self.credentials['username'],
-                password=self.credentials['password'],
-                tenant=self.credentials['tenant_name'],
-                domain=self.credentials['domain_name'],
+                user=self.credentials.username,
+                password=self.credentials.password,
+                tenant=self.credentials.tenant_name,
+                domain=self.credentials.user_domain_name,
                 auth_data=True)
         else:
             raise NotImplementedError
 
+    def _fill_credentials(self, auth_data_body):
+        # project or domain, depending on the scope
+        project = auth_data_body.get('project', None)
+        domain = auth_data_body.get('domain', None)
+        # user is always there
+        user = auth_data_body['user']
+        # Set project fields
+        if project is not None:
+            if self.credentials.project_name is None:
+                self.credentials.project_name = project['name']
+            if self.credentials.project_id is None:
+                self.credentials.project_id = project['id']
+            if self.credentials.project_domain_id is None:
+                self.credentials.project_domain_id = project['domain']['id']
+            if self.credentials.project_domain_name is None:
+                self.credentials.project_domain_name = \
+                    project['domain']['name']
+        # Set domain fields
+        if domain is not None:
+            if self.credentials.domain_id is None:
+                self.credentials.domain_id = domain['id']
+            if self.credentials.domain_name is None:
+                self.credentials.domain_name = domain['name']
+        # Set user fields
+        if self.credentials.username is None:
+            self.credentials.username = user['name']
+        if self.credentials.user_id is None:
+            self.credentials.user_id = user['id']
+        if self.credentials.user_domain_id is None:
+            self.credentials.user_domain_id = user['domain']['id']
+        if self.credentials.user_domain_name is None:
+            self.credentials.user_domain_name = user['domain']['name']
+
     def base_url(self, filters, auth_data=None):
         """
         Filters can be:
@@ -400,7 +458,15 @@
             datetime.datetime.utcnow()
 
 
-def get_credentials(credential_type=None, **kwargs):
+def get_default_credentials(credential_type, fill_in=True):
+    """
+    Returns configured credentials of the specified type
+    based on the configured auth_version
+    """
+    return get_credentials(fill_in=fill_in, credential_type=credential_type)
+
+
+def get_credentials(credential_type=None, fill_in=True, **kwargs):
     """
     Builds a credentials object based on the configured auth_version
 
@@ -420,12 +486,20 @@
     """
     if CONF.identity.auth_version == 'v2':
         credential_class = KeystoneV2Credentials
+        auth_provider_class = KeystoneV2AuthProvider
+    elif CONF.identity.auth_version == 'v3':
+        credential_class = KeystoneV3Credentials
+        auth_provider_class = KeystoneV3AuthProvider
     else:
         raise exceptions.InvalidConfiguration('Unsupported auth version')
     if credential_type is not None:
         creds = credential_class.get_default(credential_type)
     else:
         creds = credential_class(**kwargs)
+    # Fill in the credentials fields that were not specified
+    if fill_in:
+        auth_provider = auth_provider_class(creds)
+        creds = auth_provider.fill_credentials()
     return creds
 
 
@@ -454,6 +528,7 @@
         Additional attributes can still be set afterwards if tests need
         to do so.
         """
+        self._initial = kwargs
         self._apply_credentials(kwargs)
 
     def _apply_credentials(self, attr):
@@ -514,6 +589,14 @@
     def is_valid(self):
         raise NotImplementedError
 
+    def reset(self):
+        # First delete all known attributes
+        for key in self.ATTRIBUTES:
+            if getattr(self, key) is not None:
+                delattr(self, key)
+        # Then re-apply initial setup
+        self._apply_credentials(self._initial)
+
 
 class KeystoneV2Credentials(Credentials):
 
@@ -531,7 +614,7 @@
                 params[attr] = getattr(_section, attr)
             else:
                 params[attr] = getattr(_section, prefix + "_" + attr)
-        return KeystoneV2Credentials(**params)
+        return cls(**params)
 
     def is_valid(self):
         """
@@ -539,3 +622,82 @@
         Tenant is optional.
         """
         return None not in (self.username, self.password)
+
+
+class KeystoneV3Credentials(KeystoneV2Credentials):
+    """
+    Credentials suitable for the Keystone Identity V3 API
+    """
+
+    CONF_ATTRIBUTES = ['domain_name', 'password', 'tenant_name', 'username']
+    ATTRIBUTES = ['project_domain_id', 'project_domain_name', 'project_id',
+                  'project_name', 'tenant_id', 'tenant_name', 'user_domain_id',
+                  'user_domain_name', 'user_id']
+    ATTRIBUTES.extend(CONF_ATTRIBUTES)
+
+    def __init__(self, **kwargs):
+        """
+        If domain is not specified, load the one configured for the
+        identity manager.
+        """
+        domain_fields = set(x for x in self.ATTRIBUTES if 'domain' in x)
+        if not domain_fields.intersection(kwargs.keys()):
+            kwargs['user_domain_name'] = CONF.identity.admin_domain_name
+        super(KeystoneV3Credentials, self).__init__(**kwargs)
+
+    def __setattr__(self, key, value):
+        parent = super(KeystoneV3Credentials, self)
+        # for tenant_* set both project and tenant
+        if key == 'tenant_id':
+            parent.__setattr__('project_id', value)
+        elif key == 'tenant_name':
+            parent.__setattr__('project_name', value)
+        # for project_* set both project and tenant
+        if key == 'project_id':
+            parent.__setattr__('tenant_id', value)
+        elif key == 'project_name':
+            parent.__setattr__('tenant_name', value)
+        # for *_domain_* set both user and project if not set yet
+        if key == 'user_domain_id':
+            if self.project_domain_id is None:
+                parent.__setattr__('project_domain_id', value)
+        if key == 'project_domain_id':
+            if self.user_domain_id is None:
+                parent.__setattr__('user_domain_id', value)
+        if key == 'user_domain_name':
+            if self.project_domain_name is None:
+                parent.__setattr__('project_domain_name', value)
+        if key == 'project_domain_name':
+            if self.user_domain_name is None:
+                parent.__setattr__('user_domain_name', value)
+        # support domain_name coming from config
+        if key == 'domain_name':
+            parent.__setattr__('user_domain_name', value)
+            parent.__setattr__('project_domain_name', value)
+        # finally trigger default behaviour for all attributes
+        parent.__setattr__(key, value)
+
+    def is_valid(self):
+        """
+        Valid combinations of v3 credentials (excluding token, scope)
+        - User id, password (optional domain)
+        - User name, password and its domain id/name
+        For the scope, valid combinations are:
+        - None
+        - Project id (optional domain)
+        - Project name and its domain id/name
+        """
+        valid_user_domain = any(
+            [self.user_domain_id is not None,
+             self.user_domain_name is not None])
+        valid_project_domain = any(
+            [self.project_domain_id is not None,
+             self.project_domain_name is not None])
+        valid_user = any(
+            [self.user_id is not None,
+             self.username is not None and valid_user_domain])
+        valid_project = any(
+            [self.project_name is None and self.project_id is None,
+             self.project_id is not None,
+             self.project_name is not None and valid_project_domain])
+        return all([self.password is not None, valid_user, valid_project])
diff --git a/tempest/common/isolated_creds.py b/tempest/common/isolated_creds.py
index c54a8e8..9a50c0b 100644
--- a/tempest/common/isolated_creds.py
+++ b/tempest/common/isolated_creds.py
@@ -17,6 +17,7 @@
 import keystoneclient.v2_0.client as keystoneclient
 import neutronclient.v2_0.client as neutronclient
 
+from tempest import auth
 from tempest import clients
 from tempest.common.utils import data_utils
 from tempest import config
@@ -33,6 +34,7 @@
                  password='pass', network_resources=None):
         self.network_resources = network_resources
         self.isolated_creds = {}
+        self.isolated_creds_old_style = {}
         self.isolated_net_resources = {}
         self.ports = []
         self.name = name
@@ -185,22 +187,19 @@
                 self._assign_user_role(tenant['id'], user['id'], role['id'])
             else:
                 self._assign_user_role(tenant.id, user.id, role.id)
-        return user, tenant
+        return self._get_credentials(user, tenant), user, tenant
 
-    def _get_cred_names(self, user, tenant):
+    def _get_credentials(self, user, tenant):
         if self.tempest_client:
-            username = user.get('name')
-            tenant_name = tenant.get('name')
+            user_get = user.get
+            tenant_get = tenant.get
         else:
-            username = user.name
-            tenant_name = tenant.name
-        return username, tenant_name
-
-    def _get_tenant_id(self, tenant):
-        if self.tempest_client:
-            return tenant.get('id')
-        else:
-            return tenant.id
+            user_get = user.__dict__.get
+            tenant_get = tenant.__dict__.get
+        return auth.get_credentials(
+            username=user_get('name'), user_id=user_get('id'),
+            tenant_name=tenant_get('name'), tenant_id=tenant_get('id'),
+            password=self.password)
 
     def _create_network_resources(self, tenant_id):
         network = None
@@ -315,22 +314,28 @@
             self.network_admin_client.add_interface_router(router_id, body)
 
     def get_primary_tenant(self):
-        return self.isolated_creds.get('primary')[1]
+        # Deprecated. Maintained until all tests are ported
+        return self.isolated_creds_old_style.get('primary')[1]
 
     def get_primary_user(self):
-        return self.isolated_creds.get('primary')[0]
+        # Deprecated. Maintained until all tests are ported
+        return self.isolated_creds_old_style.get('primary')[0]
 
     def get_alt_tenant(self):
-        return self.isolated_creds.get('alt')[1]
+        # Deprecated. Maintained until all tests are ported
+        return self.isolated_creds_old_style.get('alt')[1]
 
     def get_alt_user(self):
-        return self.isolated_creds.get('alt')[0]
+        # Deprecated. Maintained until all tests are ported
+        return self.isolated_creds_old_style.get('alt')[0]
 
     def get_admin_tenant(self):
-        return self.isolated_creds.get('admin')[1]
+        # Deprecated. Maintained until all tests are ported
+        return self.isolated_creds_old_style.get('admin')[1]
 
     def get_admin_user(self):
-        return self.isolated_creds.get('admin')[0]
+        # Deprecated. Maintained until all tests are ported
+        return self.isolated_creds_old_style.get('admin')[0]
 
     def get_primary_network(self):
         return self.isolated_net_resources.get('primary')[0]
@@ -359,62 +364,38 @@
     def get_alt_router(self):
         return self.isolated_net_resources.get('alt')[2]
 
-    def get_primary_creds(self):
-        if self.isolated_creds.get('primary'):
-            user, tenant = self.isolated_creds['primary']
-            username, tenant_name = self._get_cred_names(user, tenant)
+    def get_credentials(self, credential_type, old_style):
+        if self.isolated_creds.get(credential_type):
+            credentials = self.isolated_creds[credential_type]
         else:
-            user, tenant = self._create_creds()
-            username, tenant_name = self._get_cred_names(user, tenant)
-            self.isolated_creds['primary'] = (user, tenant)
-            LOG.info("Acquired isolated creds:\n user: %s, tenant: %s"
-                     % (username, tenant_name))
+            is_admin = (credential_type == 'admin')
+            credentials, user, tenant = self._create_creds(admin=is_admin)
+            self.isolated_creds[credential_type] = credentials
+            # Maintained until tests are ported
+            self.isolated_creds_old_style[credential_type] = (user, tenant)
+            LOG.info("Acquired isolated creds:\n credentials: %s"
+                     % credentials)
             if CONF.service_available.neutron:
                 network, subnet, router = self._create_network_resources(
-                    self._get_tenant_id(tenant))
-                self.isolated_net_resources['primary'] = (
+                    credentials.tenant_id)
+                self.isolated_net_resources[credential_type] = (
                     network, subnet, router,)
                 LOG.info("Created isolated network resources for : \n"
-                         + " user: %s, tenant: %s" % (username, tenant_name))
-        return username, tenant_name, self.password
+                         + " credentials: %s" % credentials)
+        if old_style:
+            return (credentials.username, credentials.tenant_name,
+                    credentials.password)
+        else:
+            return credentials
 
-    def get_admin_creds(self):
-        if self.isolated_creds.get('admin'):
-            user, tenant = self.isolated_creds['admin']
-            username, tenant_name = self._get_cred_names(user, tenant)
-        else:
-            user, tenant = self._create_creds(admin=True)
-            username, tenant_name = self._get_cred_names(user, tenant)
-            self.isolated_creds['admin'] = (user, tenant)
-            LOG.info("Acquired admin isolated creds:\n user: %s, tenant: %s"
-                     % (username, tenant_name))
-            if CONF.service_available.neutron:
-                network, subnet, router = self._create_network_resources(
-                    self._get_tenant_id(tenant))
-                self.isolated_net_resources['admin'] = (
-                    network, subnet, router,)
-                LOG.info("Created isolated network resources for : \n"
-                         + " user: %s, tenant: %s" % (username, tenant_name))
-        return username, tenant_name, self.password
+    def get_primary_creds(self, old_style=True):
+        return self.get_credentials('primary', old_style)
 
-    def get_alt_creds(self):
-        if self.isolated_creds.get('alt'):
-            user, tenant = self.isolated_creds['alt']
-            username, tenant_name = self._get_cred_names(user, tenant)
-        else:
-            user, tenant = self._create_creds()
-            username, tenant_name = self._get_cred_names(user, tenant)
-            self.isolated_creds['alt'] = (user, tenant)
-            LOG.info("Acquired alt isolated creds:\n user: %s, tenant: %s"
-                     % (username, tenant_name))
-            if CONF.service_available.neutron:
-                network, subnet, router = self._create_network_resources(
-                    self._get_tenant_id(tenant))
-                self.isolated_net_resources['alt'] = (
-                    network, subnet, router,)
-                LOG.info("Created isolated network resources for : \n"
-                         + " user: %s, tenant: %s" % (username, tenant_name))
-        return username, tenant_name, self.password
+    def get_admin_creds(self, old_style=True):
+        return self.get_credentials('admin', old_style)
+
+    def get_alt_creds(self, old_style=True):
+        return self.get_credentials('alt', old_style)
 
     def _clear_isolated_router(self, router_id, router_name):
         net_client = self.network_admin_client
@@ -505,29 +486,16 @@
         if not self.isolated_creds:
             return
         self._clear_isolated_net_resources()
-        for cred in self.isolated_creds:
-            user, tenant = self.isolated_creds.get(cred)
+        for creds in self.isolated_creds.itervalues():
             try:
-                if self.tempest_client:
-                    self._delete_user(user['id'])
-                else:
-                    self._delete_user(user.id)
+                self._delete_user(creds.user_id)
             except exceptions.NotFound:
-                if self.tempest_client:
-                    name = user['name']
-                else:
-                    name = user.name
-                LOG.warn("user with name: %s not found for delete" % name)
+                LOG.warn("user with name: %s not found for delete" %
+                         creds.username)
                 pass
             try:
-                if self.tempest_client:
-                    self._delete_tenant(tenant['id'])
-                else:
-                    self._delete_tenant(tenant.id)
+                self._delete_tenant(creds.tenant_id)
             except exceptions.NotFound:
-                if self.tempest_client:
-                    name = tenant['name']
-                else:
-                    name = tenant.name
-                LOG.warn("tenant with name: %s not found for delete" % name)
+                LOG.warn("tenant with name: %s not found for delete" %
+                         creds.tenant_name)
                 pass
diff --git a/tempest/config.py b/tempest/config.py
index 7084768..634634d 100644
--- a/tempest/config.py
+++ b/tempest/config.py
@@ -72,6 +72,10 @@
                default=None,
                help="API key to use when authenticating.",
                secret=True),
+    cfg.StrOpt('domain_name',
+               default=None,
+               help="Domain name for authentication (Keystone V3)."
+                    "The same domain applies to user and project"),
     cfg.StrOpt('alt_username',
                default=None,
                help="Username of alternate user to use for Nova API "
@@ -84,6 +88,10 @@
                default=None,
                help="API key to use when authenticating as alternate user.",
                secret=True),
+    cfg.StrOpt('alt_domain_name',
+               default=None,
+               help="Alternate domain name for authentication (Keystone V3)."
+                    "The same domain applies to user and project"),
     cfg.StrOpt('admin_username',
                default=None,
                help="Administrative Username to use for "
@@ -96,6 +104,10 @@
                default=None,
                help="API key to use when authenticating as admin.",
                secret=True),
+    cfg.StrOpt('admin_domain_name',
+               default=None,
+               help="Admin domain name for authentication (Keystone V3)."
+                    "The same domain applies to user and project"),
 ]
 
 identity_feature_group = cfg.OptGroup(name='identity-feature-enabled',
@@ -302,6 +314,10 @@
                default=None,
                help="API key to use when authenticating as admin.",
                secret=True),
+    cfg.StrOpt('domain_name',
+               default=None,
+               help="Domain name for authentication as admin (Keystone V3)."
+                    "The same domain applies to user and project"),
 ]
 
 image_group = cfg.OptGroup(name='image',
@@ -996,6 +1012,13 @@
             self.compute_admin.username = self.identity.admin_username
             self.compute_admin.password = self.identity.admin_password
             self.compute_admin.tenant_name = self.identity.admin_tenant_name
+        cfg.CONF.set_default('domain_name', self.identity.admin_domain_name,
+                             group='identity')
+        cfg.CONF.set_default('alt_domain_name',
+                             self.identity.admin_domain_name,
+                             group='identity')
+        cfg.CONF.set_default('domain_name', self.identity.admin_domain_name,
+                             group='compute-admin')
 
     def __init__(self, parse_conf=True):
         """Initialize a configuration from a conf directory and conf file."""
diff --git a/tempest/tests/fake_auth_provider.py b/tempest/tests/fake_auth_provider.py
index ddffb4a..44c331e 100644
--- a/tempest/tests/fake_auth_provider.py
+++ b/tempest/tests/fake_auth_provider.py
@@ -16,6 +16,10 @@
 from tempest.tests import fake_credentials
 
 
+def get_default_credentials(credential_type, fill_in=True):
+    return fake_credentials.FakeCredentials()
+
+
 def get_credentials(credential_type=None, fill_in=True, **kwargs):
     return fake_credentials.FakeCredentials()
 
diff --git a/tempest/tests/fake_credentials.py b/tempest/tests/fake_credentials.py
index a372973..48f67d2 100644
--- a/tempest/tests/fake_credentials.py
+++ b/tempest/tests/fake_credentials.py
@@ -31,3 +31,32 @@
             tenant_name='fake_tenant_name'
         )
         super(FakeKeystoneV2Credentials, self).__init__(**creds)
+
+
+class FakeKeystoneV3Credentials(auth.KeystoneV3Credentials):
+    """
+    Fake credentials suitable for the Keystone Identity V3 API
+    """
+
+    def __init__(self):
+        creds = dict(
+            username='fake_username',
+            password='fake_password',
+            user_domain_name='fake_domain_name',
+            project_name='fake_tenant_name'
+        )
+        super(FakeKeystoneV3Credentials, self).__init__(**creds)
+
+
+class FakeKeystoneV3DomainCredentials(auth.KeystoneV3Credentials):
+    """
+    Fake credentials suitable for the Keystone Identity V3 API, with no scope
+    """
+
+    def __init__(self):
+        creds = dict(
+            username='fake_username',
+            password='fake_password',
+            user_domain_name='fake_domain_name'
+        )
+        super(FakeKeystoneV3DomainCredentials, self).__init__(**creds)
diff --git a/tempest/tests/fake_identity.py b/tempest/tests/fake_identity.py
index 058c9c2..1900fc9 100644
--- a/tempest/tests/fake_identity.py
+++ b/tempest/tests/fake_identity.py
@@ -113,7 +113,7 @@
         "expires_at": "2020-01-01T00:00:10.000123Z",
         "project": {
             "domain": {
-                "id": "fake_id",
+                "id": "fake_domain_id",
                 "name": "fake"
             },
             "id": "project_id",
@@ -121,7 +121,7 @@
         },
         "user": {
             "domain": {
-                "id": "domain_id",
+                "id": "fake_domain_id",
                 "name": "domain_name"
             },
             "id": "fake_user_id",
diff --git a/tempest/tests/test_auth.py b/tempest/tests/test_auth.py
index 7b5b4d6..03333be 100644
--- a/tempest/tests/test_auth.py
+++ b/tempest/tests/test_auth.py
@@ -47,6 +47,8 @@
         self.stubs.Set(http.ClosingHttp, 'request', self.fake_http.request)
         self.stubs.Set(auth, 'get_credentials',
                        fake_auth_provider.get_credentials)
+        self.stubs.Set(auth, 'get_default_credentials',
+                       fake_auth_provider.get_default_credentials)
         self.auth_provider = self._auth(self.credentials)
 
 
@@ -107,6 +109,10 @@
         self.assertIsNone(self.auth_provider.alt_part)
         self.assertIsNone(self.auth_provider.alt_auth_data)
 
+    def test_fill_credentials(self):
+        self.assertRaises(NotImplementedError,
+                          self.auth_provider.fill_credentials)
+
 
 class TestKeystoneV2AuthProvider(BaseAuthTestsSetUp):
     _endpoints = fake_identity.IDENTITY_V2_RESPONSE['access']['serviceCatalog']
@@ -131,6 +137,13 @@
     def _get_token_from_fake_identity(self):
         return fake_identity.TOKEN
 
+    def _get_from_fake_identity(self, attr):
+        access = fake_identity.IDENTITY_V2_RESPONSE['access']
+        if attr == 'user_id':
+            return access['user']['id']
+        elif attr == 'tenant_id':
+            return access['token']['tenant']['id']
+
     def _test_request_helper(self, filters, expected):
         url, headers, body = self.auth_provider.auth_request('GET',
                                                              self.target_url,
@@ -218,6 +231,13 @@
             del cred[attr]
             self.assertFalse(self.auth_provider.check_credentials(cred))
 
+    def test_fill_credentials(self):
+        self.auth_provider.fill_credentials()
+        creds = self.auth_provider.credentials
+        for attr in ['user_id', 'tenant_id']:
+            self.assertEqual(self._get_from_fake_identity(attr),
+                             getattr(creds, attr))
+
     def _test_base_url_helper(self, expected_url, filters,
                               auth_data=None):
 
@@ -318,12 +338,7 @@
 class TestKeystoneV3AuthProvider(TestKeystoneV2AuthProvider):
     _endpoints = fake_identity.IDENTITY_V3_RESPONSE['token']['catalog']
     _auth_provider_class = auth.KeystoneV3AuthProvider
-    credentials = {
-        'username': 'fake_user',
-        'password': 'fake_pwd',
-        'tenant_name': 'fake_tenant',
-        'domain_name': 'fake_domain_name',
-    }
+    credentials = fake_credentials.FakeKeystoneV3Credentials()
 
     def setUp(self):
         super(TestKeystoneV3AuthProvider, self).setUp()
@@ -343,10 +358,44 @@
         access['expires_at'] = date_as_string
         return token, access
 
-    def test_check_credentials_missing_tenant_name(self):
-        cred = copy.copy(self.credentials)
-        del cred['domain_name']
-        self.assertFalse(self.auth_provider.check_credentials(cred))
+    def _get_from_fake_identity(self, attr):
+        token = fake_identity.IDENTITY_V3_RESPONSE['token']
+        if attr == 'user_id':
+            return token['user']['id']
+        elif attr == 'project_id':
+            return token['project']['id']
+        elif attr == 'user_domain_id':
+            return token['user']['domain']['id']
+        elif attr == 'project_domain_id':
+            return token['project']['domain']['id']
+
+    def test_check_credentials_missing_attribute(self):
+        # reset credentials to fresh ones
+        self.credentials.reset()
+        for attr in ['username', 'password', 'user_domain_name',
+                     'project_domain_name']:
+            cred = copy.copy(self.credentials)
+            del cred[attr]
+            self.assertFalse(self.auth_provider.check_credentials(cred),
+                             "Credentials should be invalid without %s" % attr)
+
+    def test_check_domain_credentials_missing_attribute(self):
+        # reset credentials to fresh ones
+        self.credentials.reset()
+        domain_creds = fake_credentials.FakeKeystoneV3DomainCredentials()
+        for attr in ['username', 'password', 'user_domain_name']:
+            cred = copy.copy(domain_creds)
+            del cred[attr]
+            self.assertFalse(self.auth_provider.check_credentials(cred),
+                             "Credentials should be invalid without %s" % attr)
+
+    def test_fill_credentials(self):
+        self.auth_provider.fill_credentials()
+        creds = self.auth_provider.credentials
+        for attr in ['user_id', 'project_id', 'user_domain_id',
+                     'project_domain_id']:
+            self.assertEqual(self._get_from_fake_identity(attr),
+                             getattr(creds, attr))
 
     # Overwrites v2 test
     def test_base_url_to_get_admin_endpoint(self):
diff --git a/tempest/tests/test_credentials.py b/tempest/tests/test_credentials.py
index 86600fa..9da5f92 100644
--- a/tempest/tests/test_credentials.py
+++ b/tempest/tests/test_credentials.py
@@ -13,6 +13,10 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import copy
+
+from oslo.config import cfg
+
 from tempest import auth
 from tempest.common import http
 from tempest.common import tempest_fixtures as fixtures
@@ -40,6 +44,10 @@
         self.useFixture(fake_config.ConfigFixture())
         self.stubs.Set(config, 'TempestConfigPrivate', fake_config.FakePrivate)
 
+    def test_create(self):
+        creds = self._get_credentials()
+        self.assertEqual(self.attributes, creds._initial)
+
     def test_create_invalid_attr(self):
         self.assertRaises(exceptions.InvalidCredentials,
                           self._get_credentials,
@@ -77,19 +85,44 @@
         self.stubs.Set(http.ClosingHttp, 'request', self.identity_response)
         self.stubs.Set(config, 'TempestConfigPrivate', fake_config.FakePrivate)
 
-    def _verify_credentials(self, credentials_class, creds_dict):
-        creds = auth.get_credentials(**creds_dict)
-        # Check the right version of credentials has been returned
-        self.assertIsInstance(creds, credentials_class)
-        # Check the id attributes are filled in
-        attributes = [x for x in creds.ATTRIBUTES if (
-            '_id' in x and x != 'domain_id')]
-        for attr in attributes:
-            self.assertIsNone(getattr(creds, attr))
+    def _verify_credentials(self, credentials_class, filled=True,
+                            creds_dict=None):
+
+        def _check(credentials):
+            # Check the right version of credentials has been returned
+            self.assertIsInstance(credentials, credentials_class)
+            # Check the id attributes are filled in
+            attributes = [x for x in credentials.ATTRIBUTES if (
+                '_id' in x and x != 'domain_id')]
+            for attr in attributes:
+                if filled:
+                    self.assertIsNotNone(getattr(credentials, attr))
+                else:
+                    self.assertIsNone(getattr(credentials, attr))
+
+        if creds_dict is None:
+            for ctype in auth.Credentials.TYPES:
+                creds = auth.get_default_credentials(credential_type=ctype,
+                                                     fill_in=filled)
+                _check(creds)
+        else:
+            creds = auth.get_credentials(fill_in=filled, **creds_dict)
+            _check(creds)
+
+    def test_get_default_credentials(self):
+        self.useFixture(fixtures.LockFixture('auth_version'))
+        self._verify_credentials(credentials_class=self.credentials_class)
 
     def test_get_credentials(self):
         self.useFixture(fixtures.LockFixture('auth_version'))
-        self._verify_credentials(self.credentials_class, self.attributes)
+        self._verify_credentials(credentials_class=self.credentials_class,
+                                 creds_dict=self.attributes)
+
+    def test_get_credentials_not_filled(self):
+        self.useFixture(fixtures.LockFixture('auth_version'))
+        self._verify_credentials(credentials_class=self.credentials_class,
+                                 filled=False,
+                                 creds_dict=self.attributes)
 
     def test_is_valid(self):
         creds = self._get_credentials()
@@ -110,3 +143,87 @@
                 # Default configuration values related to credentials
                 # are defined as fake_* in fake_config.py
                 self.assertEqual(getattr(creds, attr), 'fake_' + attr)
+
+    def test_reset_all_attributes(self):
+        creds = self._get_credentials()
+        initial_creds = copy.deepcopy(creds)
+        set_attr = creds.__dict__.keys()
+        missing_attr = set(creds.ATTRIBUTES).difference(set_attr)
+        # Set all unset attributes, then reset
+        for attr in missing_attr:
+            setattr(creds, attr, 'fake' + attr)
+        creds.reset()
+        # Check reset credentials are same as initial ones
+        self.assertEqual(creds, initial_creds)
+
+    def test_reset_single_attribute(self):
+        creds = self._get_credentials()
+        initial_creds = copy.deepcopy(creds)
+        set_attr = creds.__dict__.keys()
+        missing_attr = set(creds.ATTRIBUTES).difference(set_attr)
+        # Set one unset attributes, then reset
+        for attr in missing_attr:
+            setattr(creds, attr, 'fake' + attr)
+            creds.reset()
+            # Check reset credentials are same as initial ones
+            self.assertEqual(creds, initial_creds)
+
+
+class KeystoneV3CredentialsTests(KeystoneV2CredentialsTests):
+    attributes = {
+        'username': 'fake_username',
+        'password': 'fake_password',
+        'project_name': 'fake_project_name',
+        'user_domain_name': 'fake_domain_name'
+    }
+
+    credentials_class = auth.KeystoneV3Credentials
+    identity_response = fake_identity._fake_v3_response
+
+    def setUp(self):
+        super(KeystoneV3CredentialsTests, self).setUp()
+        # Additional config items reset by cfg fixture after each test
+        cfg.CONF.set_default('auth_version', 'v3', group='identity')
+        # Identity group items
+        for prefix in ['', 'alt_', 'admin_']:
+            cfg.CONF.set_default(prefix + 'domain_name', 'fake_domain_name',
+                                 group='identity')
+        # Compute Admin group items
+        cfg.CONF.set_default('domain_name', 'fake_domain_name',
+                             group='compute-admin')
+
+    def test_default(self):
+        self.useFixture(fixtures.LockFixture('auth_version'))
+        for ctype in self.credentials_class.TYPES:
+            creds = self.credentials_class.get_default(credentials_type=ctype)
+            for attr in self.attributes.keys():
+                if attr == 'project_name':
+                    config_value = 'fake_tenant_name'
+                elif attr == 'user_domain_name':
+                    config_value = 'fake_domain_name'
+                else:
+                    config_value = 'fake_' + attr
+                self.assertEqual(getattr(creds, attr), config_value)
+
+    def test_synced_attributes(self):
+        attributes = self.attributes
+        # Create V3 credentials with tenant instead of project, and user_domain
+        for attr in ['project_id', 'user_domain_id']:
+            attributes[attr] = 'fake_' + attr
+        creds = self._get_credentials(attributes)
+        self.assertEqual(creds.project_name, creds.tenant_name)
+        self.assertEqual(creds.project_id, creds.tenant_id)
+        self.assertEqual(creds.user_domain_name, creds.project_domain_name)
+        self.assertEqual(creds.user_domain_id, creds.project_domain_id)
+        # Replace user_domain with project_domain
+        del attributes['user_domain_name']
+        del attributes['user_domain_id']
+        del attributes['project_name']
+        del attributes['project_id']
+        for attr in ['project_domain_name', 'project_domain_id',
+                     'tenant_name', 'tenant_id']:
+            attributes[attr] = 'fake_' + attr
+        self.assertEqual(creds.tenant_name, creds.project_name)
+        self.assertEqual(creds.tenant_id, creds.project_id)
+        self.assertEqual(creds.project_domain_name, creds.user_domain_name)
+        self.assertEqual(creds.project_domain_id, creds.user_domain_id)
diff --git a/tempest/tests/test_tenant_isolation.py b/tempest/tests/test_tenant_isolation.py
index ae2e57d..084b6d2 100644
--- a/tempest/tests/test_tenant_isolation.py
+++ b/tempest/tests/test_tenant_isolation.py
@@ -17,6 +17,7 @@
 import neutronclient.v2_0.client as neutronclient
 from oslo.config import cfg
 
+from tempest.common import http
 from tempest.common import isolated_creds
 from tempest import config
 from tempest import exceptions
@@ -27,6 +28,8 @@
 from tempest.services.network.xml import network_client as xml_network_client
 from tempest.tests import base
 from tempest.tests import fake_config
+from tempest.tests import fake_http
+from tempest.tests import fake_identity
 
 
 class TestTenantIsolation(base.TestCase):
@@ -35,6 +38,9 @@
         super(TestTenantIsolation, self).setUp()
         self.useFixture(fake_config.ConfigFixture())
         self.stubs.Set(config, 'TempestConfigPrivate', fake_config.FakePrivate)
+        self.fake_http = fake_http.fake_httplib2(return_type=200)
+        self.stubs.Set(http.ClosingHttp, 'request',
+                       fake_identity._fake_v2_response)
 
     def test_tempest_client(self):
         iso_creds = isolated_creds.IsolatedCreds('test class')
@@ -108,9 +114,9 @@
                                                  password='fake_password')
         self._mock_tenant_create('1234', 'fake_prim_tenant')
         self._mock_user_create('1234', 'fake_prim_user')
-        username, tenant_name, password = iso_creds.get_primary_creds()
-        self.assertEqual(username, 'fake_prim_user')
-        self.assertEqual(tenant_name, 'fake_prim_tenant')
+        primary_creds = iso_creds.get_primary_creds(old_style=False)
+        self.assertEqual(primary_creds.username, 'fake_prim_user')
+        self.assertEqual(primary_creds.tenant_name, 'fake_prim_tenant')
         # Verify helper methods
         tenant = iso_creds.get_primary_tenant()
         user = iso_creds.get_primary_user()
@@ -136,10 +142,10 @@
         self.addCleanup(user_mock.stop)
         with patch.object(json_iden_client.IdentityClientJSON,
                           'assign_user_role') as user_mock:
-            username, tenant_name, password = iso_creds.get_admin_creds()
+            admin_creds = iso_creds.get_admin_creds(old_style=False)
         user_mock.assert_called_once_with('1234', '1234', '1234')
-        self.assertEqual(username, 'fake_admin_user')
-        self.assertEqual(tenant_name, 'fake_admin_tenant')
+        self.assertEqual(admin_creds.username, 'fake_admin_user')
+        self.assertEqual(admin_creds.tenant_name, 'fake_admin_tenant')
         # Verify helper methods
         tenant = iso_creds.get_admin_tenant()
         user = iso_creds.get_admin_user()
@@ -153,12 +159,12 @@
                                                  password='fake_password')
         tenant_fix = self._mock_tenant_create('1234', 'fake_prim_tenant')
         user_fix = self._mock_user_create('1234', 'fake_prim_user')
-        username, tenant_name, password = iso_creds.get_primary_creds()
+        iso_creds.get_primary_creds(old_style=False)
         tenant_fix.cleanUp()
         user_fix.cleanUp()
         tenant_fix = self._mock_tenant_create('12345', 'fake_alt_tenant')
         user_fix = self._mock_user_create('12345', 'fake_alt_user')
-        alt_username, alt_tenant, alt_password = iso_creds.get_alt_creds()
+        iso_creds.get_alt_creds(old_style=False)
         tenant_fix.cleanUp()
         user_fix.cleanUp()
         tenant_fix = self._mock_tenant_create('123456', 'fake_admin_tenant')
@@ -170,8 +176,7 @@
                           [{'id': '123456', 'name': 'admin'}])))
         with patch.object(json_iden_client.IdentityClientJSON,
                           'assign_user_role'):
-            admin_username, admin_tenant, admin_pass = \
-                iso_creds.get_admin_creds()
+            iso_creds.get_admin_creds(old_style=False)
         user_mock = self.patch(
             'tempest.services.identity.json.identity_client.'
             'IdentityClientJSON.delete_user')
@@ -201,9 +206,9 @@
                                                  password='fake_password')
         self._mock_user_create('1234', 'fake_alt_user')
         self._mock_tenant_create('1234', 'fake_alt_tenant')
-        username, tenant_name, password = iso_creds.get_alt_creds()
-        self.assertEqual(username, 'fake_alt_user')
-        self.assertEqual(tenant_name, 'fake_alt_tenant')
+        alt_creds = iso_creds.get_alt_creds(old_style=False)
+        self.assertEqual(alt_creds.username, 'fake_alt_user')
+        self.assertEqual(alt_creds.tenant_name, 'fake_alt_tenant')
         # Verify helper methods
         tenant = iso_creds.get_alt_tenant()
         user = iso_creds.get_alt_user()
@@ -222,7 +227,7 @@
         router_interface_mock = self.patch(
             'tempest.services.network.json.network_client.NetworkClientJSON.'
             'add_router_interface_with_subnet_id')
-        username, tenant_name, password = iso_creds.get_primary_creds()
+        iso_creds.get_primary_creds(old_style=False)
         router_interface_mock.called_once_with('1234', '1234')
         network = iso_creds.get_primary_network()
         subnet = iso_creds.get_primary_subnet()
@@ -247,7 +252,7 @@
         router_interface_mock = self.patch(
             'tempest.services.network.json.network_client.NetworkClientJSON.'
             'add_router_interface_with_subnet_id')
-        username, tenant_name, password = iso_creds.get_primary_creds()
+        iso_creds.get_primary_creds(old_style=False)
         router_interface_mock.called_once_with('1234', '1234')
         router_interface_mock.reset_mock()
         tenant_fix.cleanUp()
@@ -262,7 +267,7 @@
         subnet_fix = self._mock_subnet_create(iso_creds, '12345',
                                               'fake_alt_subnet')
         router_fix = self._mock_router_create('12345', 'fake_alt_router')
-        alt_username, alt_tenant_name, password = iso_creds.get_alt_creds()
+        iso_creds.get_alt_creds(old_style=False)
         router_interface_mock.called_once_with('12345', '12345')
         router_interface_mock.reset_mock()
         tenant_fix.cleanUp()
@@ -285,7 +290,7 @@
                           [{'id': '123456', 'name': 'admin'}])))
         with patch.object(json_iden_client.IdentityClientJSON,
                           'assign_user_role'):
-            admin_user, admin_tenant, password = iso_creds.get_admin_creds()
+            iso_creds.get_admin_creds(old_style=False)
         self.patch('tempest.services.identity.json.identity_client.'
                    'IdentityClientJSON.delete_user')
         self.patch('tempest.services.identity.json.identity_client.'