如何为httpclient getasync方法创建模拟？

Question

我使用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：

   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创建模拟了吗（getasync）？有什么帮助吗？

Answer 1

内部GetAsync将最终调用SendAsync。

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

源代码

放宽ItExpr期望，您应该能够使它表现出预期的效果。

使用最初提供的示例

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