public function testGetPostage()
{
$country = new Country();
$area = new Area();
$instance = new FlatFeeDelivery();
$area->setPostage(2.0);
$country->setArea($area);
$this->assertEquals($instance->getPostage($country), 2.0);
$area->setPostage(null);
$country->setArea($area);
$this->assertEquals($instance->getPostage($country), 0.0);
}