def test_expected_sales_zero_div_at_pid_0():
pid = 0
pl = PriceLogic(0, pid, 5 * 60, 10)
code = "TEST"
base_price = 10
price_data = []
products_left = 10
try:
pl.add_product(code, base_price, price_data, products_left)
except ZeroDivisionError:
assert False, "Lookback at period zero fails"
