title: Angular - Unit testing Subject()?
body: <p>I have a Angular service that simply uses a Subject, but I am unsure of how to write unit tests for it.</p>
  
  <p>I saw [this thread][1], but I didn't find it terribly helpful.</p>
  
  <p>I have attempted to mock <code>next()</code> but I am more than a little lost.</p>