Create a menu through the administrator form, then Save & Close. The menu type (its internal name) is made from the title.
Examples
When I create a menu titled "Review menu"
When we create a menu titled "Review footer"
And I create a menu titled "Review links"
When create a menu titled "Review top"
And we create a menu titled "Review side"
Pattern
When(/^(I |we )*create a menu titled "([^"]*)?"$/, …)
Part of @webship-js/joomla-steps (github.com/webship/joomla-steps), a step pack for Webship-js 2.0.x.