ShimNotImplementedException : System.Net.Http.HttpMessageInvoker.Dispose()

Question

我正在使用填充程序（由 Visual Studio 生成）来伪造 HttpClient 实例。下面是 SUT:

public class ExampleForSO
{

    private HttpClient _httpClient;

    public ExampleForSO(HttpClient httpClient)
    {
        _httpClient = httpClient;
    }

    public async Task<List<string>> GetListAsync()
    {
        using (_httpClient)
        {
            return await GetListFromHostAsync(_httpClient);
        }
    }

    public async Task<List<string>> GetListFromHostAsync(HttpClient httpClient)
    {

        var responseJson = await
            httpClient.GetAsync("abc")
            .Result.Content.ReadAsStringAsync()
            ;

        var fList = JsonConvert.DeserializeObject<List<string>>(responseJson);

        return fList;
    }

这是单元测试：

[TestMethod]
public void TestMethod1()
{
    // Create a fake HttpClient
    using (ShimsContext.Create())
    {
        var fake = new ShimHttpClient()
        {

            GetAsyncString = (uri) =>
            {
                var hrm = new HttpResponseMessage(HttpStatusCode.OK);
                var list = new List<string>() {"file1", "file2"};
                hrm.Content = new StringContent(JsonConvert.SerializeObject(list));
                var t = new Task<HttpResponseMessage>(() => hrm);
                return Task.Run(() => hrm);
            }

        };

        var _exampleForSO = new ExampleForSO(fake);

        var returnValue = _exampleForSO.GetListAsync();

        // This line will throw an exception:
        var value = returnValue.Result;

        Assert.IsNotNull(returnValue);

    }
}

当我运行执行此操作时，shim 抛出 ShimNotImplemented 异常。堆栈跟踪显示：

$Action1NotImplemented71f6f23c-d227-4cb6-ac76-1f8c8094c413.Invoke(HttpMessageInvoker arg1) at System.Net.Http.HttpMessageInvoker.Dispose()

如果我注释掉 using (_httpClient) 行，单元测试将运行不抛出异常，但这不是一个好的生产解决方案。我的问题是，如何将函数分配给 System.Net.Http.HttpMessageInvoker.Dispose() shim 委托？我无法在任何地方找到对它的引用。我是否必须为 HttpMessageInvoker 创建一个假对象并将其分配给另一个 shim 属性？

Answer 1

你试过这个吗：Visual Studio 2013 Update 4 Changes MSFakes Shim Object Default Behaviour 基本上，调用 Microsoft.QualityTools.Testing.Fakes.Shims.ShimBehaviors.BehaveAsDefaultValue();在实例化垫片之前

ShimNotImplementedException : System.Net.Http.HttpMessageInvoker.Dispose()

ShimNotImplementedException : System.Net.Http.HttpMessageInvoker.Dispose()

c#

exception

dispose

dotnet-httpclient

shim