title: Use absolute paths with Jest
body: <p>I have create an app with <em>create-react-app</em>.<br>
  I have set in <em>.env</em> my <strong>NODE_PATH=src/</strong><br>
  All works fine when I launch <em>react-script start</em> but when I launch <em>react-script test</em> I have an error: import is not found.
  In my <em>package.json</em> :</p>
  
  <pre><code>"test": "jest --colors --coverage test"
  </code></pre>
  
  <p><strong>Edit</strong><br>
  It work fine with: </p>
  
  <pre><code>"jest": {
     "modulePaths": ["src/"],
     "testURL": "http://localhost",
     "jest": "^22.4.4"
  }
  </code></pre>