title: npm test -- --coverage never exits
body: <p>I am using <strong>create-react-app</strong> to create a react application. When I executes <strong>npm test -- --coverage</strong> the test never exists. npm test actually runs <strong>react-scripts test</strong>. Any Idea?</p>
  
  <p><a href="https://i.stack.imgur.com/ooy7Y.png" rel="noreferrer"><img src="https://i.stack.imgur.com/ooy7Y.png" alt="enter image description here"></a></p>