title: Cannot load underlying module for XCTest
body: <p>I'm working in swift on Xcode and by default it creates a test file that references XCTest.</p>
  <p>When I set the target membership to my main project it causes this error</p>
  <blockquote>
  <p>Cannot load underlying module for XCTest</p>
  </blockquote>
  <p>If this target membership is not set the tests runs properly and everything works fine.</p>