Save the post or page as a draft, with the editor's "Save draft" button.
Examples
When I save the post as a draft
When we save the page as a draft
And I save the post as a draft
When I save the page as a draft
And we save the post as a draft
Pattern
When(/^(I |we )*save the (post|page) as a draft$/, …)
Part of @webship-js/wordpress-steps (github.com/webship/wordpress-steps), a step pack for Webship-js 2.0.x.