Assert the site runs django CMS, optionally a given version or version line ("5", "5.1", "5.1.3"). The version is the one the toolbar reports, so the step needs a logged-in staff user on a CMS page.
Examples
Then the site should be running django CMS
Then the site should be running django CMS 5
And the site should be running django CMS 5.1
Then the site should not be running django CMS 3
But the site should not be running django CMS 4
Pattern
Then(/^the site should( not)* be running django CMS(?: (\d+(?:\.\d+)*))?$/, …)
Part of @webship-js/django-cms-steps (github.com/webship/django-cms-steps), a step pack for Webship-js 2.0.x.