def test_datatypes_datehelpers_invariance():
d = datetime(2017, 8, 25)
before = d
TimexDateHelpers.tomorrow(d)
TimexDateHelpers.yesterday(d)
TimexDateHelpers.date_part_equal(datetime.now(), d)
TimexDateHelpers.date_part_equal(d, datetime.now())
TimexDateHelpers.is_next_week(d, datetime.now())
TimexDateHelpers.is_next_week(datetime.now(), d)
TimexDateHelpers.is_last_week(datetime.now(), d)
TimexDateHelpers.week_of_year(d)
after = d
assert after is before
def test_datatypes_datehelpers_isnextweek():
today = datetime(2017, 9, 25)
assert TimexDateHelpers.is_next_week(datetime(2017, 10, 4), today) is True
assert TimexDateHelpers.is_next_week(datetime(2017, 9, 27), today) is False
assert TimexDateHelpers.is_next_week(today, today) is False