title: What is my "Target" and how do I add a file to it for unit testing?
body: <p>I'm trying to add my parser.m file to the target of my unit test (or, of my unit test file?),  but I have no idea how.</p>
  
  <p>Here's an example of a page that indicates the necessity of using the target:</p>
  
  <p><a href="https://stackoverflow.com/questions/8953966/undefined-symbols-for-architecture-i386-objc-class-appirater">Undefined symbols for architecture i386 &quot;_OBJC_CLASS_$_Appirater&quot;</a></p>
  
  <p>...and here's part of an answer from that page:</p>
  
  <blockquote>
    <p>I think, that you only added files to project, but not to target.
    Click on Appirater.m file in Project Navigator and set checkbox near to your target name in Target membership of File Inspector.</p>
  </blockquote>
  
  <p>What I don't get from that answer is, "what checkbox?". Also, how do I know my target name? Where do I find 'Target membership'?</p>