def test_itShouldFailBySayingCannotRemoveFromCart_whenWeTryToRemoveNonExistantItem(
self):
cart = Cart()
cart.add_item('iPhone')
with self.assertRaises(CannotRemoveFromCart):
cart.remove_item('Air Buds')
def test_theNumberOfItemsShouldBeEmpty_whenWeAddAnItemAndThenRemoveIt(
self):
cart = Cart()
cart.add_item('iPhone')
cart.remove_item('iPhone')
self.assertTrue(cart.is_empty())
def test_theItemShouldNotExist_whenItsQuantityIsZero(self):
cart = Cart()
cart.add_item('iPhone')
cart.remove_item('iPhone')
self.assertEqual(False, cart.exists('iPhone'))
def test_itShouldFailBySayingCannotRemoveFromCart_whenWeRemoveItemFromEmptyCart(
self):
cart = Cart()
with self.assertRaises(CannotRemoveFromCart):
cart.remove_item('iPhone')