ChildSuite.php

<?php

require_once 'OneTest.php';
require_once 'TwoTest.php';
class ChildSuite {
  public static function suite() {
    $suite = new PHPUnit_Framework_TestSuite('Child');
    $suite
      ->addTestSuite('OneTest');
    $suite
      ->addTestSuite('TwoTest');
    return $suite;
  }

}