diff --git a/keystoneclient/tests/v3/test_credentials.py b/keystoneclient/tests/v3/test_credentials.py
index d6ad4555c..5dad49c9c 100644
--- a/keystoneclient/tests/v3/test_credentials.py
+++ b/keystoneclient/tests/v3/test_credentials.py
@@ -44,6 +44,7 @@ class CredentialTests(utils.TestCase, utils.CrudTests):
         # which should be translated into "blob" at the API call level
         req_ref = self.new_ref()
         api_ref = self._ref_data_not_blob(req_ref)
+        req_ref.pop('id')
         self.test_create(api_ref, req_ref)
 
     def test_update_data_not_blob(self):
diff --git a/keystoneclient/tests/v3/test_domains.py b/keystoneclient/tests/v3/test_domains.py
index 101d3f9c9..38ad8e4f2 100644
--- a/keystoneclient/tests/v3/test_domains.py
+++ b/keystoneclient/tests/v3/test_domains.py
@@ -43,6 +43,5 @@ class DomainTests(utils.TestCase, utils.CrudTests):
                                            enabled=False)
 
     def test_update_enabled_defaults_to_none(self):
-        req_ref = self.new_ref()
-        del req_ref['enabled']
-        super(DomainTests, self).test_update(req_ref=req_ref)
+        super(DomainTests, self).test_update(
+            req_ref={'name': uuid.uuid4().hex})
diff --git a/keystoneclient/tests/v3/test_regions.py b/keystoneclient/tests/v3/test_regions.py
index 3574ece3f..7f3343e73 100644
--- a/keystoneclient/tests/v3/test_regions.py
+++ b/keystoneclient/tests/v3/test_regions.py
@@ -33,6 +33,5 @@ class RegionTests(utils.TestCase, utils.CrudTests):
         return kwargs
 
     def test_update_enabled_defaults_to_none(self):
-        req_ref = self.new_ref()
-        del req_ref['enabled']
-        super(RegionTests, self).test_update(req_ref=req_ref)
+        super(RegionTests, self).test_update(
+            req_ref={'description': uuid.uuid4().hex})
diff --git a/keystoneclient/tests/v3/test_trusts.py b/keystoneclient/tests/v3/test_trusts.py
index 0b8028f85..f435c9eba 100644
--- a/keystoneclient/tests/v3/test_trusts.py
+++ b/keystoneclient/tests/v3/test_trusts.py
@@ -55,6 +55,7 @@ class TrustTests(utils.TestCase, utils.CrudTests):
         ref['trustee_user_id'] = uuid.uuid4().hex
         ref['impersonation'] = False
         req_ref = ref.copy()
+        req_ref.pop('id')
 
         # Note the TrustManager takes a list of role_names, and converts
         # internally to the slightly odd list-of-dict API format, so we
@@ -71,6 +72,7 @@ class TrustTests(utils.TestCase, utils.CrudTests):
         ref['expires_at'] = timeutils.parse_isotime(
             '2013-03-04T12:00:01.000000Z')
         req_ref = ref.copy()
+        req_ref.pop('id')
 
         # Note the TrustManager takes a datetime.datetime object for
         # expires_at, and converts it internally into an iso format datestamp
@@ -90,6 +92,7 @@ class TrustTests(utils.TestCase, utils.CrudTests):
         ref['trustee_user_id'] = uuid.uuid4().hex
         ref['impersonation'] = True
         req_ref = ref.copy()
+        req_ref.pop('id')
         ref['role_names'] = ['atestrole']
         req_ref['roles'] = [{'name': 'atestrole'}]
         super(TrustTests, self).test_create(ref=ref, req_ref=req_ref)
diff --git a/keystoneclient/tests/v3/utils.py b/keystoneclient/tests/v3/utils.py
index d4c201bf0..8c7613500 100644
--- a/keystoneclient/tests/v3/utils.py
+++ b/keystoneclient/tests/v3/utils.py
@@ -202,8 +202,11 @@ class CrudTests(object):
         # signature for the request when the manager does some
         # conversion before doing the request (e.g. converting
         # from datetime object to timestamp string)
-        req_ref = (req_ref or ref).copy()
-        req_ref.pop('id')
+        if req_ref:
+            req_ref = req_ref.copy()
+        else:
+            req_ref = ref.copy()
+            req_ref.pop('id')
 
         self.stub_entity('POST', entity=req_ref, status_code=201)
 
@@ -304,8 +307,11 @@ class CrudTests(object):
         # signature for the request when the manager does some
         # conversion before doing the request (e.g. converting
         # from datetime object to timestamp string)
-        req_ref = (req_ref or ref).copy()
-        req_ref.pop('id')
+        if req_ref:
+            req_ref = req_ref.copy()
+        else:
+            req_ref = ref.copy()
+            req_ref.pop('id')
 
         returned = self.manager.update(ref['id'], **parameterize(req_ref))
         self.assertIsInstance(returned, self.model)