public function testAppActionRendersView()
 {
     $templating = $this->getMockBuilder(EngineInterface::class)->getMock();
     $templating->expects(self::once())->method('render');
     $container = $this->getMockBuilder(Container::class)->getMock();
     $container->expects(self::atLeastOnce())->method('get')->will(self::returnCallback(function ($name) use($templating) {
         if ($name == 'templating') {
             return $templating;
         }
     }));
     $controller = new AppController();
     $controller->setContainer($container);
     $response = $controller->appAction();
     self::assertInstanceOf(Response::class, $response);
 }