def test_adjust_start_date_accounts_for_lag():
# Going back 10 days happens to be Sunday
args = ['20170118', True]
actual = churn.adjust_start_date(*args)
expected = '20170108'
assert actual == expected
def test_adjust_start_date_pins_to_sunday_no_lag():
# A wednesday
args = ['20170118', False]
actual = churn.adjust_start_date(*args)
expected = '20170115'
assert actual == expected