def test_different_day(self):
        begin_ts = 683153828123456789
        # 24 hours later
        end_ts = 683240228123456789
        collection = TraceCollection(begin_ts, end_ts)
        result = trace_utils.is_multi_day_trace_collection(collection)

        self.assertTrue(result)
    def test_same_day(self):
        begin_ts = 683153828123456789
        # 1 hour later
        end_ts = 683157428123456789
        collection = TraceCollection(begin_ts, end_ts)
        result = trace_utils.is_multi_day_trace_collection(collection)

        self.assertFalse(result)