code: public function paintGroupStart($test_case, $size)
      {
          if ($this->just_this_case && $this->matchesTestCase($test_case)) {
              $this->on();
          }
          $this->reporter->paintGroupStart($test_case, $size);
      }
docs: Paints the start of a group test.
  
  @param string $test_case     Name of test or other label.
  @param int $size         Number of test cases starting.