title: Test Artifact doesn't appear in Android Studio
body: <p>I've followed all the steps found in this <a href="https://sites.google.com/a/android.com/tools/tech-docs/unit-testing-support" rel="nofollow">tutorial</a> and added JUnit</p>
  
  <p>But Test Artifacts doesn't appear in "Build variants" tool window.</p>
  
  <p>How can I display this option?</p>