public function testDeferredEvaluation()
{
$doubleOdds = new Container();
$doubleOdds->filter('Dash\\Functions\\isOdd')->map(function ($n) {
return $n * 2;
});
$this->assertEquals(array(2, 6), $doubleOdds->with(array(1, 2, 3))->value());
$this->assertEquals(array(14, 18, 22, 26), $doubleOdds->with(array(7, 9, 11, 13))->value());
}