title: No code coverage driver is available in xampp windows
body: <p>I want to run phpunit testcase with codecoverage report and for that i am using following command:</p>
  
  <pre><code>D:\xampp7.1.9\htdocs\mailzap&gt;phpunit --coverage-html reports
  </code></pre>
  
  <p>output: </p>
  
  <pre><code>PHPUnit 6.3.0 by Sebastian Bergmann and contributors.
  Error:         No code coverage driver is available
  
  .                                                  1 / 1 (100%)
  
  Time: 469 ms, Memory: 8.00MB
  
  OK (1 test, 1 assertion)
  </code></pre>
  
  <p>php@version : 7.1.9  phpunit@version:6.3.0<br>
  but still converge report not generated.
  in lumen framework</p>