Sign out of the shop through the customer menu of the header ("Sign out").
Examples
When I sign out of the shop
When we sign out of the shop
And I sign out of the shop
Then I sign out of the shop
When sign out of the shop
Pattern
When(/^(I |we )*sign out of the shop$/, …)
Part of @webship-js/prestashop-steps (github.com/webship/prestashop-steps), a step pack for Webship-js 2.0.x.