Earlier quoted context omitted.
So a CMS that works as the client requires and has a very nice UI can't be taken seriously because it has no tests? That's a very developer focused mindset. I'm glad it's been open sourced and I hope to see tests added by them or the community, but it's not a deal-breaker for me. And if you contribute tests I hope they'll be full functional tests to spot cross-browser regressions, JS breaks and the rest ;)
Clients do care about having a stable and bug free software. Tests is one of the best way to achieve this.
Playing devil's advocate here: Testing the system throughout to ensure components play nicely together and that functionally the system works as expected - this is in my opinion more important than unit testing.