Assert the dashboard is, or is not, on screen: the Dashboard module's .dashboard layout, with the "Dashboard" page title as the fallback.
Examples
Then I should see the dashboard
And I should see the admin dashboard
Then we should see the dashboard
And I should not see the dashboard
Then we should not see the admin dashboard
Pattern
Then(/^(I |we )*should( not)* see the (?:admin )?dashboard$/, …)
Part of @webship-js/drupal-cms-steps (github.com/webship/drupal-cms-steps), a step pack for Webship-js 2.0.x.