Add a tag to the post or page in the settings panel: an existing tag is picked from the list, a new name creates the tag.
Examples
When I add the tag "News" to the post
When I add the tag "Guides" to the post
When we add the tag "Travel" to the post
And I add the tag "A tag from the suite" to the post
When I add the tag "News" to the page
Pattern
When(/^(?:I |we )?add the tag "([^"]*)" to the (?:post|page)$/, …)
Part of @webship-js/ghost-steps (github.com/webship/ghost-steps), a step pack for Webship-js 2.0.x.