title: Setup the environment variable "KERNEL_DIR" symfony phpunit
body: <p>I am encountering some problems when running some PHPUnit Tests in a different directory.</p>
  
  <p>I've searched around; the answer is that I have to change the environment variable <code>KERNEL_DIR</code>.</p>
  
  <p>Any idea how to change this variable?</p>
  
  <p>Based on what kind of pattern, is the folder where <code>HTTPKernel.php</code> is located or some other files located.</p>
  
  <p>Is it to specify the path within the new folder or the path for the original folder?</p>