[英]How to write unit test case IHttpClientFactory
我在服務層中有一個方法可以連接到服務,並且我正在使用IHttpClientFactory
。 我的方法工作正常。 現在我正在嘗試為此編寫單元測試用例。
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;
}
對於上述方法,我正在編寫測試用例。 在這里,我嘗試將 Post 方法設置為 OK,並期望MyMethodAsync
方法為 true,因為PostAsync
為 true。 在這里我遇到了一個例外
System.InvalidOperationException:提供了無效的請求 URI。 請求 URI 必須是絕對 URI,或者必須設置 BaseAddress。
[Test]
public async Task MyMethodAsync_Gets_True()
{
var response = new HttpResponseMessage(HttpStatusCode.OK)
{
Content = new StringContent("It worked!")
};
//Mock the httpclientfactory
var _httpMessageHandler = new Mock<HttpMessageHandler>();
var mockFactory = new Mock<IHttpClientFactory>();
//Specify here the http method as post
_httpMessageHandler.Protected()
.Setup<Task<HttpResponseMessage>>("SendAsync",
ItExpr.Is<HttpRequestMessage>(req => req.Method == HttpMethod.Post),
ItExpr.IsAny<CancellationToken>())
.ReturnsAsync(new HttpResponseMessage
{
StatusCode = HttpStatusCode.OK
});
var httpClient = new HttpClient(_httpMessageHandler.Object);
mockFactory.Setup(_ => _.CreateClient(It.IsAny<string>())).Returns(httpClient);
var arg1 = "X";
var arg2 = "D101";
var service = new MyService(_mockAppSettings.Object, mockFactory.Object);
var result = await service.MyMethodAsync(arg1, arg2);
// Assert
Assert.IsNotNull(result);
}
有人可以顯示我在這里犯了什么錯誤嗎?
正如例外所說,你必須
PostAsync
BaseAddress
如果您選擇第二個,您需要做的就是:
var httpClient = new HttpClient(_httpMessageHandler.Object);
httpClient.BaseAddress = new Uri("http://nonexisting.domain"); //New code
mockFactory.Setup(_ => _.CreateClient(It.IsAny<string>())).Returns(httpClient);
通過此修改,異常將消失。
但是您的測試將失敗,因為response.Content
將是null
,這就是MyMethodAsync
將返回null
的原因。
要解決此問題,讓我們將設置更改為:
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);
}
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