title: The 'describe' keyword in javascript
body: <p>So I am a newbie in javascript and i had been going through some one else's code and I found this..  </p>
  
  <pre><code>describe('deviceready', function() {
      it('should report that it fired', function() {
          spyOn(app, 'report');
          app.deviceready();
          expect(app.report).toHaveBeenCalledWith('deviceready');
      });
  });
  </code></pre>
  
  <p>What I don't understand is: 
  What exactly does the <code>describe</code> keyword do?</p>
  
  <p>info:<br>
   -  Its a <strong>phonegap</strong> application<br>
   -  We are using the <em>spine.js</em> and <em>jQuery</em> libraries  </p>