title: How to assert JSON equality in python-behave with diffs on failing tests?
body: <p>How do I assert JSON equality in python-behave and get a diff as output when assertion fails?</p>
  
  <p>In Ruby I use: <a href="https://github.com/collectiveidea/json_spec" rel="nofollow">https://github.com/collectiveidea/json_spec</a> , so I am basically looking for similar functionality in Python.</p>
  
  <p>With a normal <code>assert</code> statement the output is very unhelpful.</p>