PHP框架的扩展机制如何进行测试？

public function testServiceProvider(): void
{
    $provider = new MyServiceProvider();
    $provider->register();

    $this->assertInstanceOf(MyService::class, app('my_service'));
    $this->assertEquals('Hello World', my_service()->sayHello());
}

public function testMiddleware(): void
{
    $middleware = new MyMiddleware();

    $request = new Request();
    $response = $middleware->handle($request, function () {
        return 'Hello World';
    });

    $this->assertEquals($response->getContent(), 'Hello from MyMiddleware');
}

public function testCommand(): void
{
    $command = new MyCommand();

    $input = new MockInput();
    $output = new MockOutput();
    $command->run($input, $output);

    $this->assertStringContainsString('Task created', $output->output);
}

public function testEventListener(): void
{
    $event = new MyEvent();
    $listenerMock = $this->createMock(MyEventListener::class);
    $listenerMock->expects($this->once())->method('handle')->with($event);

    Event::listen(MyEvent::class, [MyEventListener::class, 'handle']);
    Event::dispatch($event);
}

{
    "scripts": {
        "test": "phpunit",
        "test:watch": "vendor/bin/phpunit --watch"
    }
}