def test_start_checkout() -> None:
"""Test the start_checkout function of the Checkout Class."""
a = RegularLine(3)
b = ExpressLine(3)
c = SelfServeLine(3)
c1 = Customer('A', [Item('bananas', 7)])
c2 = Customer('B', [])
c3 = Customer('C', [Item('orange', 5)])
c4 = Customer('D', [Item('grapes', 10), Item('avacado', 1)])
a.queue = [c1]
b.queue = [c2, c3]
c.queue = [c4]
assert a.start_checkout() == 7
a.queue = [c1, c2]
assert a.start_checkout() == 7
assert b.start_checkout() == 0
b.queue = [c3]
assert b.start_checkout() == 5
assert c.start_checkout() == 22
c.queue = [c1, c2, c3, c4]
assert c.start_checkout() == 14
def test_complete_checkout() -> None:
"""Test the complete_checkout function of the Checkout Class."""
a = RegularLine(3)
b = ExpressLine(3)
c = SelfServeLine(3)
c1 = Customer('A', [Item('bananas', 7)])
c2 = Customer('B', [])
c3 = Customer('C', [Item('orange', 5)])
c4 = Customer('D', [Item('grapes', 10), Item('avacado', 1)])
a.queue = [c1]
b.queue = [c2, c3]
c.queue = [c4]
assert a.complete_checkout() == False and a.queue == []
a.queue = [c2, c1]
assert a.complete_checkout() == True and a.queue == [c1]
assert b.complete_checkout() == True and b.queue == [c3]
assert c.complete_checkout() == False and c.queue == []
