Updates

unitgrade/unitgrade.py

@@ -77,7 +77,7 @@ class QItem(unittest.TestCase):
         if self.tol > 0 and self.testfun is None:
             self.testfun = self.assertL2Relative
         else:
-            self.testfun = unittest.TestCase.assertEqual
+            self.testfun = self.assertEqual
 
         self.name = self.__class__.__name__
         self._correct_answer_payload = correct_answer_payload