public function testConfiguration()
{
$configuration = new ContainerBuilder();
$loader = new SonataPriceExtension();
$config = $this->getDefaultConfig();
$loader->load($config, $configuration);
$this->assertTrue($configuration instanceof ContainerBuilder);
$this->assertTrue($configuration->hasParameter('sonata.price.currency'));
$this->assertEquals('EUR', $configuration->getParameter('sonata.price.currency'));
}