public function testTransform()
{
$pool = $this->getMockBuilder('Sonata\\Component\\Delivery\\Pool')->disableOriginalConstructor()->getMock();
$transformer = new DeliveryMethodTransformer($pool);
$delivery = new FreeDelivery(false);
$delivery->setCode("deliveryCode");
$this->assertEquals("deliveryCode", $transformer->transform($delivery));
$this->assertNull($transformer->transform(null));
}