Currently tests run on $(window).load() which makes it difficult to test code that has its own initializing code - currently the case with TinyMCE.
start()/stop() could be expanded as a mechanism to control that. stop() would be called before window.load is triggered, checking if its already running, and disabling the default start, eg. by setting config.delayStart. runTest() would then check config.delayStart before setting config.block = false. A call to start() should work as usual, without any modifications necessary.