Extend the E2E tests for CKEditor.
That means, creating, modifiy, delete forum posts and topics.
The CKEditor tests should handle many common use cases, including:
- create gallery
- write some text with emotes
- switch to small editor and back
- insert bbc tags, etc (iframely, ....)
Then save it and validate the content.
It probably makes sense to create in dev mode a special endpoint to receive a message as plain bbc to validate it's content. (probably the quote xml endpoint could do the trick already)