title: Jest global variables that persist
body: <p>I see that <a href="https://facebook.github.io/jest/docs/en/configuration.html#globals" rel="noreferrer">global variables</a> can be specified across Jest tests but that:</p>
  
  <blockquote>
    <p>mutation will not be persisted across test runs for other test files.</p>
  </blockquote>
  
  <p>Is there way to make changes to global variables that persist across all test files?</p>