public function testGetProperties() {
$twig = new Twig_Environment(new Twig_Loader_String(), array(
'debug' => true,
'cache' => false,
'autoescape' => false,
));
$d1 = new DateTime();
$d2 = new DateTime();
$output = $twig
->render('{{ d1.date }}{{ d2.date }}', compact('d1', 'd2'));
// If it fails, PHP will crash.
$this
->assertEquals($output, $d1->date . $d2->date);
}