diff --git a/barbicanclient/tests/test_client.py b/barbicanclient/tests/test_client.py
index 570b9ab5..b0269b23 100644
--- a/barbicanclient/tests/test_client.py
+++ b/barbicanclient/tests/test_client.py
@@ -250,38 +250,6 @@ class WhenTestingGetErrorMessage(TestClient):
 
 class BaseEntityResource(testtools.TestCase):
 
-    # TODO: The compatibility of unittest between versions is horrible
-    # Reported as https://bugs.launchpad.net/testtools/+bug/1373139
-    if hasattr(testtools.TestCase, 'assertItemsEqual'):
-        # If this function is available, do nothing (PY27)
-        pass
-    elif hasattr(testtools.TestCase, 'assertCountEqual'):
-        # If this function is available, alias it (PY32+)
-        assertItemsEqual = testtools.TestCase.assertCountEqual
-    else:
-        # If neither is available, make our own version (PY26, PY30-31)
-        def assertItemsEqual(self, expected_seq, actual_seq, msg=None):
-            first_seq, second_seq = list(expected_seq), list(actual_seq)
-            differences = []
-            for item in first_seq:
-                if item not in second_seq:
-                    differences.append(item)
-
-            for item in second_seq:
-                if item not in first_seq:
-                    differences.append(item)
-
-            if differences:
-                if not msg:
-                    msg = "Items differ: {0}".format(differences)
-                self.fail(msg)
-            if len(first_seq) != len(second_seq):
-                if not msg:
-                    msg = "Size of collection differs: {0} != {1}".format(
-                        len(first_seq), len(second_seq)
-                    )
-                self.fail(msg)
-
     def _setUp(self, entity, entity_id='abcd1234-eabc-5678-9abc-abcdef012345'):
         super(BaseEntityResource, self).setUp()
         self.responses = self.useFixture(fixture.Fixture())