title: Class 'PHPUnit_Framework_TestCase' not found
body: <p>This error occurs on my public build project: <a href="https://travis-ci.org/byjg/authuser/jobs/211336643" rel="noreferrer">https://travis-ci.org/byjg/authuser/jobs/211336643</a></p>
  
  <p>I ran locally using php 7.0 and php 7.1 on my Ubuntu and this problem does not occur.</p>
  
  <p>Travis runs successful on PHP 5.6</p>
  
  <p>Could you help me?</p>