title: Added unit testing target to Xcode - failed to import bridging header won't go away
body: <p>I added a new Test target to my Xcode project. My project has Swift code and Objective-C code, and has a bridging header. Upon either adding the bridging header to UnitTesting's build settings, or doing <code>import MyTarget</code>, I'm getting the error:</p>
  
  <blockquote>
    <p>failed to import bridging header</p>
  </blockquote>
  
  <p>I've tried:</p>
  
  <ul>
  <li>Adding the bridging header to project, unit testing and main target's build settings.</li>
  <li>Changing <code>defines modules</code> to <code>Yes</code>.</li>
  <li>Moving the bridging header file to the root folder.</li>
  </ul>
  
  <p>I've also tried making a sample project, which built and worked fine. Taking everything I have over into a clean new project isn't an option at this point.</p>