title: Generate only tests from existing model / controllers
body: <p>I have a Rails3 app that is based on someone else's work.  For some reason they decided not to supply the tests with the app, which I am finding frustrating.</p>
  
  <p>What I want to be able to do is scaffold the tests for all the existing controllers and models so I can get a head start on creating the tests myself in test::unit.  I don't want to recreate the models or controllers, just create the tests.</p>
  
  <p>I am new to Rails, and have hunted about for the rake command that might do this, but all with no luck so far. Any advice / direction most appreciated.</p>