Adjust item qty in cart about little_shop HOT 1 CLOSED

Background: My cart has an item in it
As a visitor
When I visit "/cart"
Then I should see my item with a quantity of 1
And when I increase the quantity
Then my current page should be '/cart'
And that item's quantity should reflect the increase
And the subtotal for that item should increase
And the total for the cart should match that increase
And when I decrease the quantity
Then my current page should be '/cart'
And that item's quantity should reflect the decrease
And the subtotal for that item should decrease
And the total for the cart should match that decrease

from little_shop.