Assert the number of the version the toolbar shows. Every new draft of a page gets the next number.
Examples
Then the page should be at version 1
Then the page should be at version 2
And the page should be at version 3
Then the page should not be at version 1
But the page should not be at version 2
Pattern
Then(/^the page should( not)* be at version (\d+)$/, …)
Part of @webship-js/django-cms-steps (github.com/webship/django-cms-steps), a step pack for Webship-js 2.0.x.