title: How much additional time does unit testing take?
body: <p>I am looking for possibly a study between the time difference of regular coding vs coding + unit tests (not strict TDD just yet). I know the whole "Saves you time in the long run" angle, but from a project planning perspective for the team that has never done it before, I need to be able to roughly estimate how much additional time to allocate.</p>
  
  <p>Does such a study exist? Can anyone comment from experience?</p>