Open the cart with the cart link of the header (the cart page, /cart).
Examples
When I open the cart
When we open the cart
And I open the cart
When open the cart
And we open the cart
Pattern
When(/^(I |we )*open the cart$/, …)
Part of @webship-js/squarespace-steps (github.com/webship/squarespace-steps), a step pack for Webship-js 2.0.x.