Extra assertion that PRC3 default replica ordering is by ascending replica number.

Author: d-w-moore

irods/test/data_obj_test.py

@@ -3017,6 +3017,13 @@ def test_modified_sorting_of_replicas__issue_746(self):
                     ['0', '1', '1']
                 )
 
+                # Get a data object with the PRC3-default sort order. Ordering is expected to
+                # be ascending by replica number.
+                if irods.version.version_as_tuple() < (4,):
+                    data = self.sess.data_objects.get(data.path)
+                    for i, repl in enumerate(data.replicas):
+                        self.assertEqual(repl.number, i)
+
                 options = {}
                 if irods.version.version_as_tuple() < (4,):
                     options['replica_sort_function'] = _REPLICA_FITNESS_SORT_KEY_FN