helloAction example

'annotations' => false,
                    'http_method_override' => false,
                    'handle_all_throwables' => true,
                    'php_errors' => ['log' => true],
                    'router' => ['utf8' => true],
                ]);
                $c->services()->set('logger', NullLogger::class);
            }

            protected function configureRoutes(RoutingConfigurator $routes): void
            {
                $routes->add('hello', '/')->controller($this->helloAction(...));
            }
        };

        $request = Request::create('/');
        $response = $kernel->handle($request, HttpKernelInterface::MAIN_REQUEST, false);

        $this->assertSame('Hello World!', $response->getContent());
    }
}

abstract class MinimalKernel extends Kernel
{