def test_next_datetime_with_range_values(cron_expr, first_of_june, expected):
it = CrontabScheduler(cron_expr, first_of_june)
assert next(it) == expected
def test_next_datetime_with_repeat(cron_expr, first_of_june, repeat, expected):
it = CrontabScheduler(cron_expr, first_of_june)
for _ in range(repeat - 1):
next(it)
assert next(it) == expected
def test_next_datetime_with_multiple_single_values(cron_expr, day_in_june,
expected):
it = CrontabScheduler(cron_expr, day_in_june)
assert next(it) == expected
def test_next_datetime_with_step_values(cron_expr, day_in_june):
with pytest.raises(ValueError):
CrontabScheduler(cron_expr, day_in_june)