def test_replace_cart_line_form(cart, product_in_stock):
variant = product_in_stock.variants.get()
initial_quantity = 1
replaced_quantity = 4
cart.add(variant, initial_quantity)
data = {'quantity': replaced_quantity}
form = forms.ReplaceCartLineForm(data=data, cart=cart, variant=variant)
assert form.is_valid()
form.save()
assert cart.quantity == replaced_quantity
def test_replace_cartline_form_when_insufficient_stock(monkeypatch, cart,
product_in_stock):
variant = product_in_stock.variants.get()
initial_quantity = 1
replaced_quantity = 4
cart.add(variant, initial_quantity)
exception_mock = InsufficientStock(
Mock(get_stock_quantity=Mock(return_value=2)))
monkeypatch.setattr('saleor.product.models.ProductVariant.check_quantity',
Mock(side_effect=exception_mock))
data = {'quantity': replaced_quantity}
form = forms.ReplaceCartLineForm(data=data, cart=cart, variant=variant)
assert not form.is_valid()
with pytest.raises(KeyError):
form.save()
assert cart.quantity == initial_quantity
