title: Two instances of rspec, do they interfere with each other?
body: <p>I've been fiddling with Guard trying to get it to load rspec tests, but it's throwing some errors about the test schema.</p>
  
  <p>I realised that I had rspec being run on the whole test suite (takes ~30 mins) in another terminal window in the background. I looked and these tests were also throwing errors (not expected to).</p>
  
  <p>Is there simply one 'test' database that both rspec executions were messing with—and therefore causing each other to fail? Or can I run simultaneous processes without worry?</p>