如何为httpclient getasync方法创建模拟? [英] How to create mock for httpclient getasync method?

问题描述

我正在使用Moq为单元测试创​​建模拟，但是当我不得不为httpclient的getasync方法创建模拟时，我陷入了困境.以前我使用的是SendAsync方法，为此，我可以使用以下代码:

I am using Moq to create mocks for my unit tests but I am stuck when I have to create mock for getasync method of httpclient. Previously I was using SendAsync method and for that I could use the below code:

   var mockResponse =
            new HttpResponseMessage(HttpStatusCode.OK) {Content = new StringContent(expectedResponse)};
        mockResponse.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
        var mockHandler = new Mock<DelegatingHandler>();
        mockHandler
            .Protected()
            .Setup<Task<HttpResponseMessage>>(
                "SendAsync",
                ItExpr.Is<HttpRequestMessage>(
                    message => message.Headers.Contains("Authorization")
                               && message.Headers.Authorization.Parameter.Equals(accessToken)
                               && message.Headers.Authorization.Scheme.Equals("Bearer")
                               && message.RequestUri.AbsoluteUri.Contains(baseUrl)
                ),
                ItExpr.IsAny<CancellationToken>())
            .Returns(Task.FromResult(mockResponse));

现在我有一个方法:

  private async Task<List<Model>> GetData()
  {
        string url = url;
        _httpClient.BaseAddress = new Uri(url);
        _httpClient.DefaultRequestHeaders.Add(Headers.AuthorizationHeader, "Bearer" + "token");
        var response = await _httpClient.GetAsync(url);
        response.EnsureSuccessStatusCode();
        return await response.Content.ReadAsAsync<List<Model>>();
  }

现在我可以为此方法(getasync)创建模拟了吗?有帮助吗?

Now can I create mock for this method (getasync)? Any help?

推荐答案

内部GetAsync最终将调用SendAsync.

public Task<HttpResponseMessage> GetAsync(Uri requestUri, HttpCompletionOption completionOption,
    CancellationToken cancellationToken)
{
    return SendAsync(new HttpRequestMessage(HttpMethod.Get, requestUri), completionOption, cancellationToken);
}

松开ItExpr期望，您应该能够使其表现出预期的效果.

Loosen the ItExpr expectation and you should be able to get it to behave as expected.

使用最初提供的示例

mockHandler
    .Protected()
    .Setup<Task<HttpResponseMessage>>(
        "SendAsync",
        ItExpr.IsAny<HttpRequestMessage>(),
        ItExpr.IsAny<CancellationToken>()
    )
    .ReturnsAsync(mockResponse);

这篇关于如何为httpclient getasync方法创建模拟?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！