title: iOS Swift: Separate AppDelegate for XCTest
body: <p>Due to a couple issues, I want the XCTest target in a project to run a separate app delegate. Using ObjC, this was a relatively straightforward process: manipulate <code>main.m</code> (see: <a href="https://stackoverflow.com/a/15725328/1299041">https://stackoverflow.com/a/15725328/1299041</a>).</p>
  
  <p>Since it seems that a Swift application is initialized with <code>@UIApplicationMain</code> in the AppDelegate, is it possible to initialize with a separate AppDelegate for the test target?</p>