function testGetConfig()
 {
     $app = new App();
     $newExt = new Extension($app);
     $newExt->setConfig('test2', 'valB');
     $newExt->setConfig('test1', 'valC');
     $app->addExtension($newExt);
     $app->setConfig('test1', 'valA');
     $this->assertEquals('valA', $app->getConfig('test1'));
     $this->assertEquals('valB', $app->getConfig('test2'));
 }