如何在派生控制器中模拟HttpContext.RequestServices.GetService<>注入的服务？

// 模拟的服务接口
public interface IMyService
{
    void DoSomething();
}

// 模拟的服务实现
public class MyService : IMyService
{
    public void DoSomething()
    {
        // 实现具体的功能
    }
}

// 派生控制器
public class MyController : BaseController
{
    private readonly IMyService _myService;

    public MyController(IMyService myService)
    {
        _myService = myService;
    }

    public void Action()
    {
        _myService.DoSomething();
    }
}

// 模拟的HttpContext对象
public class MockHttpContext : HttpContext
{
    public override IServiceProvider RequestServices { get; set; }
}

// 模拟的服务提供程序
public class MockServiceProvider : IServiceProvider
{
    public object GetService(Type serviceType)
    {
        if (serviceType == typeof(IMyService))
        {
            return new MyService();
        }
        return null;
    }
}

// 在测试中使用模拟的HttpContext对象和服务提供程序
public void Test()
{
    var mockHttpContext = new MockHttpContext();
    mockHttpContext.RequestServices = new MockServiceProvider();

    var controller = new MyController(mockHttpContext.RequestServices.GetService<IMyService>());
    controller.Action();
}