title: How to exit bash function if error?
body: <p>I am making a presubmit script. It looks like this:</p>
  
  <pre><code>function presubmit() {
    gradle test android
    gradle test ios
    gradle test server
    git push origin master
  }
  </code></pre>
  
  <p>I want the function to exit, if any of the tests fail so it won't push a bug to git. How?</p>