@covers Symfony\Component\DependencyInjection\ContainerBuilder::registerExtension @covers Symfony\Component\DependencyInjection\ContainerBuilder::getExtension
public function testExtension() {
$container = new ContainerBuilder();
$container
->setResourceTracking(false);
$container
->registerExtension($extension = new \ProjectExtension());
$this
->assertTrue($container
->getExtension('project') === $extension, '->registerExtension() registers an extension');
$this
->setExpectedException('LogicException');
$container
->getExtension('no_registered');
}