public function testGetServiceProvider()
{
$ext = new NormalExtension();
$providers = $ext->getServiceProviders();
$this->assertInstanceOf('Bolt\\Extension\\AbstractExtension', $providers[0]);
$this->assertInstanceOf('Silex\\ServiceProviderInterface', $providers[0]);
$this->assertInstanceOf('Symfony\\Component\\EventDispatcher\\EventSubscriberInterface', $providers[0]);
}