Assert that the cart page lists, or does not list, a product.
Examples
Then the cart should contain "Hummingbird printed t-shirt"
Then the cart should not contain "Customizable mug"
And the cart should contain "Mug The best is yet to come"
Then the cart should contain "Mug The adventure begins"
Then the cart should not contain "Hummingbird printed t-shirt"
Pattern
Then(/^the cart should( not)* contain "([^"]*)"$/, …)
Part of @webship-js/prestashop-steps (github.com/webship/prestashop-steps), a step pack for Webship-js 2.0.x.