fix failing test

Author: d-w-moore

irods/test/data_obj_test.py

@@ -1251,10 +1251,9 @@ def test_replica_number(self):
         # refresh object
         obj = session.data_objects.get(obj_path)
 
-        # assertions on replicas
+        # assertions on replicas 
         self.assertEqual(len(obj.replicas), number_of_replicas)
-        for i, replica in enumerate(obj.replicas):
-            self.assertEqual(replica.number, i)
+        self.assertEqual({repl.number for repl in obj.replicas}, {*range(4)})
 
         # now trim odd-numbered replicas
         # note (see irods/irods#4861): COPIES_KW might disappear in the future