Change the quantity of a line of the cart and press "Update Shopping Cart".
Examples
When I change the cart quantity of "Joust Duffle Bag" to 3
When I change the cart quantity of "Radiant Tee" to 1
And I change the cart quantity of "Aim Analog Watch" to 2
When we change the cart quantity of "Joust Duffle Bag" to 5
When change the cart quantity of "Radiant Tee" to 4
Pattern
When(/^(I |we )*change the cart quantity of "([^"]*)" to (\d+)$/, …)
Part of @webship-js/magento-steps (github.com/webship/magento-steps), a step pack for Webship-js 2.0.x.