public function testRandomFunctionReturnsAsIs() {
$this
->assertSame('', twig_random(new Twig_Environment(), ''));
$this
->assertSame('', twig_random(new Twig_Environment(null, array(
'charset' => null,
)), ''));
$instance = new stdClass();
$this
->assertSame($instance, twig_random(new Twig_Environment(), $instance));
}