If you ever worked at a company that uses a shared server for development, you know that even 20 concurrent developers can bring a sizable machine (not top, but also not bad) down to its knees if they run some sizable framework in dev mode. Code running amok (oops, infinite loop again), test suites running all the time, databases being overloaded by people doing 'some load testing'.

I don't believe that koding will give you an environment that is in any way better than your local stuff (except when they ask the full hosting costs per developer). So the idea that they continuously run your test suite in any way better than a proper setup on your local machine is wishful thinking.