title: Mocha JS: How to reuse assertions within a spec?
body: <p>I'm using Mocha bdd for unit testing.</p>
  
  <p>Within my specifications, multiple test cases make use of the same assertions.</p>
  
  <p>I would like to pull these shared assertions out into a reusable block.</p>
  
  <p>How can I do this?</p>