/**
  * Track a test path.
  *
  * @param AbstractTest $test
  * @return void
  */
 protected function trackTest(AbstractTest $test, $exception = null)
 {
     $file = $test->getFile();
     if (!isset($this->suites[$file])) {
         $this->suites[$file] = [];
     }
     $this->suites[$file][] = ['test' => $test, 'exception' => $exception];
 }