@dataProvider getTestsForString
public function testStringExpression($template, $expected) {
$env = new Twig_Environment(new Twig_Loader_String(), array(
'cache' => false,
'autoescape' => false,
'optimizations' => 0,
));
$stream = $env
->tokenize($template, 'index');
$parser = new Twig_Parser($env);
$this
->assertEquals($expected, $parser
->parse($stream)
->getNode('body')
->getNode(0)
->getNode('expr'));
}