Assert the structure board is (or is not) showing.
Examples
Then I should see the structure board
Then I should not see the structure board
And we should see the structure board
Then should see the structure board
But we should not see the structure board
Pattern
Then(/^(I |we )*should( not)* see the structure board$/, …)
Part of @webship-js/django-cms-steps (github.com/webship/django-cms-steps), a step pack for Webship-js 2.0.x.