Cloud development and testing help a lot too.  I can kick off a run of the entire test suite in the cloud, and get right back to coding, all while keeping tabs on the tests&#x27; output in a tmux terminal.<p>I&#x27;m typically editing in parallel with tests running.  This can frequently result in no down time whatsoever owing to tests, even during a large refactor.  Let&#x27;s say I make a big refactor and 90 different test classes break (this is not theoretical).  I modify some code that might make one of those test classes past, kick of a test run, and immediately go edit another failing test class.  By the time I think I&#x27;ve got that figured out, the test run on the first has completed, and I can either move on, or try something else to fix it if it&#x27;s failed again.  This requires keeping the state of multiple test classes in your head simultaneously, but fortunately I&#x27;m good at that.