def test_datatypes_datehelpers_yesterday():
assert TimexDateHelpers.yesterday(datetime(2017, 1,
1)) == datetime(2016, 12, 31)
assert TimexDateHelpers.yesterday(datetime(2017, 1,
2)) == datetime(2017, 1, 1)
assert TimexDateHelpers.yesterday(datetime(2017, 3,
1)) == datetime(2017, 2, 28)
assert TimexDateHelpers.yesterday(datetime(2016, 2,
29)) == datetime(2016, 2, 28)
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