public class Order
    {
        public string Id { get; set; }

        public string ProductCode { get; set; }

        public decimal Price { get; set; }
        
        public int Quantity { get; set; }

        public decimal Amount { get; set; }
    }

    public class SendMessageRequest
    {
        public string MessageId { get; set; }

        public string Message { get; set; }

        public List<int> UserIds { get; set; }
    }

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllers();
            // 啟用擴(kuò)展庫(kù)
            services.AddExtensions(Configuration);

            // 消息服務(wù)所使用的HttpClient名稱MESSAGESERVICE
            IHttpClientBuilder messageClient = services.AddHttpClient("MESSAGESERVICE", client =>
            {
                // 設(shè)置基礎(chǔ)地址
                client.BaseAddress = new Uri("http://api.hello.com/");
            });
            // 只有Mock配置設(shè)置為true時(shí)，才啟用，通過(guò)開(kāi)發(fā)應(yīng)用配置文件來(lái)配置
            if (Configuration.GetValue<bool>("Mock"))
            {
                // 配置針對(duì)消息服務(wù)客戶端，POST到/message/send接口的請(qǐng)求，都將返回一個(gè)ResponseMessage
                messageClient.AddMockHttpMessageHandler()
                    .AddMock<ResponseMessage>("/message/send", HttpMethod.Post, new ResponseMessage());
            } 

        }

{
  "Mock": true
}

    [Route("api/order")]
    [ApiController]
    public class OrderController : ControllerBase
    {
        readonly HttpClient messageClient;
        public OrderController(IHttpClientFactory clientFactory)
        {
            // 創(chuàng)建消息服務(wù)所使用的客戶端，名稱與配置所使用的名稱一致
            // 實(shí)際項(xiàng)目中千萬(wàn)不要寫(xiě)上哦~
            messageClient = clientFactory.CreateClient("MESSAGESERVICE");
        }

        [HttpPost]
        public async Task<ResponseMessage> SaveOrder([FromBody]Order order)
        {
            // 保存訂單，省略了....
            // 調(diào)用消息服務(wù)接口
            ResponseMessage response = await messageClient.PostAsync<ResponseMessage>(
                "/message/send", new SendMessageRequest()
                {
                    MessageId = Guid.NewGuid().ToString("N").ToLower(),
                    Message = "訂單已提交",
                    UserIds = new List<int>() { 1,2,3}
                });
            // 根據(jù)消息服務(wù)返回應(yīng)答繼續(xù)處理，省略了...

            return response;
        }
    }

{
    "code": "0",
    "message": null,
    "isSuccess": true
}

        [Fact]
        public async Task Test1()
        {
            IServiceCollection services = new ServiceCollection()
                .AddExtensions();

            services.AddHttpClient("TESTCLIENT")
                .AddMockHttpMessageHandler()
                // 請(qǐng)求/test/exception將觸發(fā)異常
                .AddMock("/test/exception", HttpMethod.Get, new Exception(""))
                // 針對(duì) /test/404 返回404應(yīng)答
                .AddMock("/test/404", HttpMethod.Get, HttpStatusCode.NotFound)
                // 返回指定類型
                .AddMock<int>("/test/obj", HttpMethod.Get, 100)
                // 自定義條件及應(yīng)答
                .AddMock(request =>
                {
                    if (request.Headers.Contains("hello"))
                    {
                        return true;
                    }
                    return false;
                }, async (request, response) =>
                {
                    // 如果是調(diào)用第三方服務(wù)，你可以在這里檢查request發(fā)出的請(qǐng)求內(nèi)容是否正確

                    // 自定義應(yīng)答內(nèi)容
                    await response.WriteObjectAsync(new
                    {
                        test = "Hello World"
                    });
                })
                // 針對(duì)所有請(qǐng)求返回字符串Hello
                .AddMock("*", HttpMethod.Get, "Hello");

            IServiceProvider provider = services.BuildServiceProvider();

            IHttpClientFactory clientFactory = provider.GetRequiredService<IHttpClientFactory>();
            HttpClient client = clientFactory.CreateClient("TESTCLIENT");
            client.BaseAddress = new Uri("http://localhost");

            HttpResponseMessage resposne = await client.GetAsync("/test/404");
            Assert.Equal(HttpStatusCode.NotFound, resposne.StatusCode);
        }