HTTPClientFactory MOQ 測試cancellationToken 在正常運行時為true，但在執行單元測試用例時取消token 為false

Question

我正在嘗試使用 IHttpClientFactory 進行 PostAsync 調用，取消令牌工作正常，異常被 CatchBlock 捕獲。

但是當試圖模擬該方法時，Cancellation 標記為 false 並且 catch 塊未被捕獲

以下代碼為 controller 和起訂量 class

值控制器.cs

[Route("[controller]")]
    [ApiController]
    public class ValuesController : ControllerBase
    {
        private readonly IHttpClientFactory _httpClientFactory;
        public ValuesController(IHttpClientFactory httpClientFactory)
        {
            _httpClientFactory = httpClientFactory;
        }
        [HttpGet]
        public async Task<ActionResult> Get()
        {
            try
            {
                var client = _httpClientFactory.CreateClient("Test");//Statup register this in startup.cs
                 /*services.AddHttpClient("Test", httpClient =>{});*/
                apiTable table = new apiTable();
                table.Name = "Asma Nadeem";
                table.Roll = "6655";
                string json = JsonConvert.SerializeObject(table);
                CancellationTokenSource source = new CancellationTokenSource(1);

                StringContent httpContent = new StringContent(json, System.Text.Encoding.UTF8, "application/json");

                var response = await client.PostAsync("https://jsonplaceholder.typicode.com/posts", httpContent, source.Token);

//Source.Token is false when running the below MOQ test case
                string result = "" + response.Content + " : " + response.StatusCode;

                return StatusCode(200, result);
            }
            catch (OperationCanceledException e)
            {
                return null;
            }
            catch (Exception e)
            {
                return null;
            }
        }
    }

起訂量 Class

單元測試1.cs

public class UnitTest1
    {

        [Fact]
        public void Test1()
        {
            //Arrange
            var mockFactory = new Mock<IHttpClientFactory>();
            var mockHttpMessageHandler = new Mock<HttpMessageHandler>();
            mockHttpMessageHandler.Protected()
                .Setup<Task<HttpResponseMessage>>("SendAsync", ItExpr.IsAny<HttpRequestMessage>(), ItExpr.IsAny<CancellationToken>())
                .ReturnsAsync(new HttpResponseMessage
                {
                    StatusCode = HttpStatusCode.OK,
                    Content = new StringContent("{'name':thecodebuzz,'city':'USA'}"),
                });

            var client = new HttpClient(mockHttpMessageHandler.Object);
            mockFactory.Setup(_ => _.CreateClient(It.IsAny<string>())).Returns(client);
            ValuesController controller = new ValuesController(mockFactory.Object);

            //Act
            var result = controller.Get() ;

            //Assert
            Assert.NotNull(result);
            //Assert.Equal(HttpStatusCode.OK, (HttpStatusCode)result.StatusCode);
        }
    }

Answer 1

如果您想評估 catch 分支，請設置您的模擬以拋出OperationCanceledException

mockHttpMessageHandler.Protected()
                .Setup<Task<HttpResponseMessage>>("SendAsync", ItExpr.IsAny<HttpRequestMessage>(), ItExpr.IsAny<CancellationToken>())
                .ThrowsAsync(new OperationCanceledException(...));