C# 如何编写单元测试用例IHttpClientFactory

我在服务层有一个连接到服务的方法，我正在使用

IHttpClientFactory

。我的方法很有效。现在我正试图为同样的问题编写单元测试用例

public async Task<MyObject> MyMethodAsync(string arg1, string arg2)
{
    var client = _httpClientFactory.CreateClient("XYZ");

    var Authkey = "abc"; 
    var AuthToken = "def";
       
    var headers = new Dictionary<string, string>
        {
            { Authkey,AuthToken }
        };

    client.AddTokenToHeader(headers); //This method set  the DefaultRequestheader from the dictionary object

    var reqData = new
    {
        prop1 = "X", 
        prop2 = "Y"
    };//req object

    var content = new StringContent(JsonConvert.SerializeObject(reqData), Encoding.UTF8, "application/json");

    //This is httpClient Post call for posting data 
    HttpResponseMessage response = await client.PostAsync("postData", content); 
    if (!response.IsSuccessStatusCode || response.Content == null)
    {
        return null;
    }

    MyObject myObject = JsonConvert.DeserializeObject<MyObject>(response.Content.ReadAsStringAsync().Result);//read the result to an object
    return myObject;
}

---

有人能告诉我我在这里犯了什么错误吗？

例外情况是你必须这样做

• 使用绝对url调用

  PostAsync

• 或者设置HttpClient的

  BaseAddress

如果选择第二个选项，则只需执行以下操作：

var httpClient=newhttpclient（_httpMessageHandler.Object）；
httpClient.BaseAddress=新Uri（“http://nonexisting.domain"); //新代码
mockFactory.Setup（=>wk.CreateClient（It.IsAny（）））.Returns（httpClient）；

---

通过此修改，例外情况将消失。
但是您的测试将失败，因为

响应.Content

将为

null

，这就是为什么

MyMethodAsync

将返回

null

要解决此问题，请将设置更改为：

public static async Task MyMethodAsync_Gets_True()
{
    //Arrange
    MyObject resultObject = new MyObject();
    var response = new HttpResponseMessage(HttpStatusCode.OK)
    {
        Content = new StringContent(JsonConvert.SerializeObject(resultObject))
    };

    var _httpMessageHandler = new Mock<HttpMessageHandler>();
    _httpMessageHandler.Protected()
        .Setup<Task<HttpResponseMessage>>("SendAsync",
          ItExpr.Is<HttpRequestMessage>(req => req.Method == HttpMethod.Post),
          ItExpr.IsAny<CancellationToken>())
        .ReturnsAsync(response);
    ...

    //Act
    var result = await service.MyMethodAsync(arg1, arg2);

    //Assert
    Assert.NotNull(result);
}

publicstaticasync任务MyMethodAsync\u Gets\u True（）
{
//安排
MyObject resultObject=新的MyObject（）；
var响应=新的HttpResponseMessage（HttpStatusCode.OK）
{
内容=新的StringContent（JsonConvert.SerializeObject（resultObject））
};
var_httpMessageHandler=new Mock（）；
_httpMessageHandler.Protected（）
.Setup（“SendAsync”，
ItExpr.Is（req=>req.Method==HttpMethod.Post），
ItExpr.IsAny（））
.ReturnsAsync（答复）；
...
//表演
var result=await service.MyMethodAsync（arg1，arg2）；
//断言
Assert.NotNull（结果）；
}

我已修改以添加基地址。

public static async Task MyMethodAsync_Gets_True()
{
    //Arrange
    MyObject resultObject = new MyObject();
    var response = new HttpResponseMessage(HttpStatusCode.OK)
    {
        Content = new StringContent(JsonConvert.SerializeObject(resultObject))
    };

    var _httpMessageHandler = new Mock<HttpMessageHandler>();
    _httpMessageHandler.Protected()
        .Setup<Task<HttpResponseMessage>>("SendAsync",
          ItExpr.Is<HttpRequestMessage>(req => req.Method == HttpMethod.Post),
          ItExpr.IsAny<CancellationToken>())
        .ReturnsAsync(response);
    ...

    //Act
    var result = await service.MyMethodAsync(arg1, arg2);

    //Assert
    Assert.NotNull(result);
}