def test_format_timedelta(self): d = datetime(2015, 1, 1) - datetime(2015, 1, 1) assert times.format_TIMEDELTA(d) == '0 0:0:0' d = datetime(2015, 1, 1, 10, 11, 12) - datetime(2015, 1, 1, 8, 9, 10) assert times.format_TIMEDELTA(d) == '0 2:2:2' d = datetime(2015, 1, 1, 10, 11, 12) - datetime(2015, 1, 1, 11, 12, 13) assert times.format_TIMEDELTA(d) == '-1 22:58:59'