yet another test correction

Author: d-w-moore

irods/test/data_obj_test.py

@@ -1269,10 +1269,7 @@ def test_replica_number(self):
         obj = session.data_objects.get(obj_path)
 
         # check remaining replica numbers
-        replica_numbers = []
-        for replica in obj.replicas:
-            replica_numbers.append(replica.number)
-        self.assertEqual(replica_numbers, [0, 2, 4, 6])
+        self.assertEqual({r.number for r in obj.replicas}, {0, 2, 4, 6})
 
         # remove object
         obj.unlink(force=True)