diff --git a/keystoneclient/utils.py b/keystoneclient/utils.py
index db3ce74a6..479f7c01c 100644
--- a/keystoneclient/utils.py
+++ b/keystoneclient/utils.py
@@ -108,7 +108,7 @@ def find_resource(manager, name_or_id):
         msg = ("Multiple %s matches found for '%s', use an ID to be more"
                " specific." % (manager.resource_class.__name__.lower(),
                                name_or_id))
-        raise exc.CommandError(msg)
+        raise exceptions.CommandError(msg)
 
 
 def unauthenticated(f):
diff --git a/keystoneclient/v3/users.py b/keystoneclient/v3/users.py
index f4870939e..7bd781f62 100644
--- a/keystoneclient/v3/users.py
+++ b/keystoneclient/v3/users.py
@@ -17,6 +17,7 @@
 import logging
 
 from keystoneclient import base
+from keystoneclient import exceptions
 
 
 LOG = logging.getLogger(__name__)
diff --git a/tests/test_utils.py b/tests/test_utils.py
index ea3b039e2..94c4a09e6 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -38,6 +38,9 @@ class FakeManager(object):
             raise exceptions.NotFound(resource_id)
 
     def find(self, name=None):
+        if name == '9999':
+            # NOTE(morganfainberg): special case that raises NoUniqueMatch.
+            raise exceptions.NoUniqueMatch()
         for resource_id, resource in self.resources.items():
             if resource['name'] == str(name):
                 return resource
@@ -76,3 +79,9 @@ class FindResourceTestCase(test_utils.TestCase):
     def test_find_by_int_name(self):
         output = utils.find_resource(self.manager, 9876)
         self.assertEqual(output, self.manager.resources['5678'])
+
+    def test_find_no_unique_match(self):
+        self.assertRaises(exceptions.CommandError,
+                          utils.find_resource,
+                          self.manager,
+                          9999)
diff --git a/tests/v3/test_users.py b/tests/v3/test_users.py
index d1974b2ee..9982feab2 100644
--- a/tests/v3/test_users.py
+++ b/tests/v3/test_users.py
@@ -20,6 +20,7 @@ import uuid
 
 import requests
 
+from keystoneclient import exceptions
 from keystoneclient.v3 import users
 from tests.v3 import utils
 
@@ -63,6 +64,10 @@ class UserTests(utils.TestCase, utils.CrudTests):
         self.mox.ReplayAll()
 
         self.manager.add_to_group(user=ref['id'], group=group_id)
+        self.assertRaises(exceptions.ValidationError,
+                          self.manager.remove_from_group,
+                          user=ref['id'],
+                          group=None)
 
     def test_list_users_in_group(self):
         group_id = uuid.uuid4().hex
@@ -110,6 +115,11 @@ class UserTests(utils.TestCase, utils.CrudTests):
 
         self.manager.check_in_group(user=ref['id'], group=group_id)
 
+        self.assertRaises(exceptions.ValidationError,
+                          self.manager.check_in_group,
+                          user=ref['id'],
+                          group=None)
+
     def test_remove_user_from_group(self):
         group_id = uuid.uuid4().hex
         ref = self.new_ref()
@@ -131,6 +141,10 @@ class UserTests(utils.TestCase, utils.CrudTests):
         self.mox.ReplayAll()
 
         self.manager.remove_from_group(user=ref['id'], group=group_id)
+        self.assertRaises(exceptions.ValidationError,
+                          self.manager.remove_from_group,
+                          user=ref['id'],
+                          group=None)
 
     def test_create_with_project(self):
         # Can create a user with the deprecated project option rather than