Fix test.

Author: jverswijver

tests/test_aggr_regressions.py

@@ -6,6 +6,7 @@
 from nose.tools import assert_equal, raises
 import datajoint as dj
 from . import PREFIX, CONN_INFO
+import uuid
 from .schema_uuid import Topic, Item, top_level_namespace_id
 schema = dj.Schema(PREFIX + '_aggr_regress', connection=dj.conn(**CONN_INFO))