模拟 IHttpClientFactory - xUnit C#
Mocking IHttpClientFactory - xUnit C#
我试图在我的项目中构建一个通用的 HTTP 服务(c# with .net core 2.1),我已经按照下面的代码片段 HttpService
.
完成了它
我也开始使用它,从我的业务逻辑 class 中调用它,它使用这个通用的 PostAsync
方法 post 对第三方的 HTTP 调用,其中内容在正文中.它完美运行。
但是,当我尝试测试它时,我失败了!
实际上,当我尝试调试(测试模式)时,当调试器在业务 class Processor
中到达此行 var result = await _httpService.PostAsync("https://test.com/api", content);
时,我得到 null
响应,即使使用假对象和模拟,尽管它在没有 testing/mocking.
的调试模式下正常工作
HTTP 服务:
public interface IHttpService
{
Task<HttpResponseMessage> PostAsync(string requestUri, HttpContent content);
}
public class HttpService : IHttpService
{
private readonly IHttpClientFactory _httpClientFactory;
public HttpService(IHttpClientFactory httpClientFactory)
{
_httpClientFactory = httpClientFactory;
}
public async Task<HttpResponseMessage> PostAsync(string requestUri, HttpContent content)
{
var httpClient = _httpClientFactory.CreateClient();
httpClient.Timeout = TimeSpan.FromSeconds(3);
var response = await httpClient.PostAsync(requestUri, content).ConfigureAwait(false);
response.EnsureSuccessStatusCode();
return response;
}
}
商业class:
public class Processor : IProcessor
{
private readonly IHttpService _httpService;
public Processor() { }
public Processor(IHttpService httpService, IAppSettings appSettings)
{
_httpService = httpService;
}
public async Task<HttpResponseMessage> PostToVendor(Order order)
{
// Building content
var json = JsonConvert.SerializeObject(order, Formatting.Indented);
var content = new StringContent(json, Encoding.UTF8, "application/json");
// HTTP POST
var result = await _httpService.PostAsync("https://test.com/api", content); // returns null during the test without stepping into the method PostAsyn itself
return result;
}
}
测试class:
public class MyTests
{
private readonly Mock<IHttpService> _fakeHttpMessageHandler;
private readonly IProcessor _processor; // contains business logic
private readonly Fixture _fixture = new Fixture();
public FunctionTest()
{
_fakeHttpMessageHandler = new Mock<IHttpService>();
_processor = new Processor(_fakeHttpMessageHandler.Object);
}
[Fact]
public async Task Post_To_Vendor_Should_Return_Valid_Response()
{
var fakeHttpResponseMessage = new Mock<HttpResponseMessage>(MockBehavior.Loose, new object[] { HttpStatusCode.OK });
var responseModel = new ResponseModel
{
success = true,
uuid = Guid.NewGuid().ToString()
};
fakeHttpResponseMessage.Object.Content = new StringContent(JsonConvert.SerializeObject(responseModel), Encoding.UTF8, "application/json");
var fakeContent = _fixture.Build<DTO>().Create(); // DTO is the body which gonna be sent to the API
var content = new StringContent(JsonConvert.SerializeObject(fakeContent), Encoding.UTF8, "application/json");
_fakeHttpMessageHandler.Setup(x => x.PostAsync(It.IsAny<string>(), content))
.Returns(Task.FromResult(fakeHttpResponseMessage.Object));
var res = _processor.PostToVendor(fakeContent).Result;
Assert.NotNull(res.Content);
var actual = JsonConvert.SerializeObject(responseModel);
var expected = await res.Content.ReadAsStringAsync();
Assert.Equal(expected, actual);
}
}
您的问题出在模拟设置中:
_fakeHttpMessageHandler.Setup(x => x.PostAsync(It.IsAny<string>(), content))
.Returns(Task.FromResult(fakeHttpResponseMessage.Object));
PostAsync 方法的第二个参数应为 content
,但由于 StringContent 是引用类型,因此您在 mock 中设置的 content
不同于您在处理器中创建的 content
。如果将其更改为下一个,它应该会按预期工作:
_fakeHttpMessageHandler.Setup(x => x.PostAsync(It.IsAny<string>(), It.IsAny<StringContent>()))
.Returns(Task.FromResult(fakeHttpResponseMessage.Object));
P.S。对 PostAsync 的空响应意味着该方法具有默认设置,这意味着它将 return 默认值
我试图在我的项目中构建一个通用的 HTTP 服务(c# with .net core 2.1),我已经按照下面的代码片段 HttpService
.
我也开始使用它,从我的业务逻辑 class 中调用它,它使用这个通用的 PostAsync
方法 post 对第三方的 HTTP 调用,其中内容在正文中.它完美运行。
但是,当我尝试测试它时,我失败了!
实际上,当我尝试调试(测试模式)时,当调试器在业务 class Processor
中到达此行 var result = await _httpService.PostAsync("https://test.com/api", content);
时,我得到 null
响应,即使使用假对象和模拟,尽管它在没有 testing/mocking.
HTTP 服务:
public interface IHttpService
{
Task<HttpResponseMessage> PostAsync(string requestUri, HttpContent content);
}
public class HttpService : IHttpService
{
private readonly IHttpClientFactory _httpClientFactory;
public HttpService(IHttpClientFactory httpClientFactory)
{
_httpClientFactory = httpClientFactory;
}
public async Task<HttpResponseMessage> PostAsync(string requestUri, HttpContent content)
{
var httpClient = _httpClientFactory.CreateClient();
httpClient.Timeout = TimeSpan.FromSeconds(3);
var response = await httpClient.PostAsync(requestUri, content).ConfigureAwait(false);
response.EnsureSuccessStatusCode();
return response;
}
}
商业class:
public class Processor : IProcessor
{
private readonly IHttpService _httpService;
public Processor() { }
public Processor(IHttpService httpService, IAppSettings appSettings)
{
_httpService = httpService;
}
public async Task<HttpResponseMessage> PostToVendor(Order order)
{
// Building content
var json = JsonConvert.SerializeObject(order, Formatting.Indented);
var content = new StringContent(json, Encoding.UTF8, "application/json");
// HTTP POST
var result = await _httpService.PostAsync("https://test.com/api", content); // returns null during the test without stepping into the method PostAsyn itself
return result;
}
}
测试class:
public class MyTests
{
private readonly Mock<IHttpService> _fakeHttpMessageHandler;
private readonly IProcessor _processor; // contains business logic
private readonly Fixture _fixture = new Fixture();
public FunctionTest()
{
_fakeHttpMessageHandler = new Mock<IHttpService>();
_processor = new Processor(_fakeHttpMessageHandler.Object);
}
[Fact]
public async Task Post_To_Vendor_Should_Return_Valid_Response()
{
var fakeHttpResponseMessage = new Mock<HttpResponseMessage>(MockBehavior.Loose, new object[] { HttpStatusCode.OK });
var responseModel = new ResponseModel
{
success = true,
uuid = Guid.NewGuid().ToString()
};
fakeHttpResponseMessage.Object.Content = new StringContent(JsonConvert.SerializeObject(responseModel), Encoding.UTF8, "application/json");
var fakeContent = _fixture.Build<DTO>().Create(); // DTO is the body which gonna be sent to the API
var content = new StringContent(JsonConvert.SerializeObject(fakeContent), Encoding.UTF8, "application/json");
_fakeHttpMessageHandler.Setup(x => x.PostAsync(It.IsAny<string>(), content))
.Returns(Task.FromResult(fakeHttpResponseMessage.Object));
var res = _processor.PostToVendor(fakeContent).Result;
Assert.NotNull(res.Content);
var actual = JsonConvert.SerializeObject(responseModel);
var expected = await res.Content.ReadAsStringAsync();
Assert.Equal(expected, actual);
}
}
您的问题出在模拟设置中:
_fakeHttpMessageHandler.Setup(x => x.PostAsync(It.IsAny<string>(), content))
.Returns(Task.FromResult(fakeHttpResponseMessage.Object));
PostAsync 方法的第二个参数应为 content
,但由于 StringContent 是引用类型,因此您在 mock 中设置的 content
不同于您在处理器中创建的 content
。如果将其更改为下一个,它应该会按预期工作:
_fakeHttpMessageHandler.Setup(x => x.PostAsync(It.IsAny<string>(), It.IsAny<StringContent>()))
.Returns(Task.FromResult(fakeHttpResponseMessage.Object));
P.S。对 PostAsync 的空响应意味着该方法具有默认设置,这意味着它将 return 默认值