def test_concat_two_carts_with_two_differents_items():
result_cart = Cart.concat(
cart(item(reference='x', quantity=1)),
cart(item(reference='y', quantity=1)))
assert Cart.create(
item(reference='x', quantity=1),
item(reference='y', quantity=1)) == result_cart
def test_bundle_serie_of_should_build_max_bundles():
bundler = bundle_series_of(references=['A', 'B'])
result_bundles = list(
bundler(
cart(item(reference='A', quantity=3),
item(reference='B', quantity=2))))
assert result_bundles == [Bundle(size=2)] * 2 + [Bundle(size=1)]
def price_for(*items):
return pricer(cart(*items),
bundle_series_of(references=['A', 'B', 'C', 'D', 'E']))
def test_bundle_serie_of_with_empty_cart():
bundler = bundle_series_of(references=['A', 'B'])
assert list(bundler(cart())) == []
def test_emptycart_is_neutral_element():
neutral = cart()
element = cart(item())
assert Cart.concat(neutral, element) == element
assert Cart.concat(element, neutral) == element
def test_empty_cart_is_empty():
assert cart().items == tuple()
def test_concat_two_carts_with_same_items():
result_cart = Cart.concat(
cart(item(reference='x', quantity=3)),
cart(item(reference='x', quantity=2)))
assert Cart.create(item(reference='x', quantity=5)) == result_cart
def test_associativity():
x = cart(item())
y = cart(item())
z = cart(item())
assert Cart.concat(Cart.concat(x, y), z) == Cart.concat(x, Cart.concat(y, z))
