c# - 如果使用 CreateResponse 扩展方法返回 Azure Function HttpResponseMessage，则执行测试时出错

Question

我的Azure函数代码如下

public static class MyHttpTriggerFunction
{       
    public static async Task<HttpResponseMessage> Run([HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)]HttpRequestMessage req, TraceWriter log)
    {
        // some business logic

        if (valid)
        {
            return req.CreateResponse(HttpStatusCode.OK, true);
        }
        else
        {
             return req.CreateResponse(HttpStatusCode.BadRequest, "some error message");
        }            
    }
}

在我的测试项目中，我正在读取如下结果:

var result = await MyHttpTriggerFunction.Run(req, log).ConfigureAwait(false);

执行该函数后，当它尝试在结果变量中返回响应时，测试方法失败并出现异常。

**

System.InvalidOperationException: The request does not have an associated configuration object or the provided configuration was null.

**

我已确保测试项目具有相同的 System.Net.Http.HttpRequestMessageExtension dll。

如果我更改函数代码不使用 CreateResponse 扩展方法(此扩展方法来自 VS 2017 模板的代码) 并返回如下响应，我在测试方法中得到响应，并且测试用例运行良好。

var res = new HttpResponseMessage();
if (valid)
{
    res.StatusCode = HttpStatusCode.OK;
    res.Content = new ObjectContent<bool>(true, new JsonMediaTypeFormatter());        
    return res;
}
else
{
     res.StatusCode = HttpStatusCode.BadRequest;
     res.Content = new ObjectContent<string>("some error message", new JsonMediaTypeFormatter());
     return res;
}

下面是错误的堆栈跟踪

Result StackTrace: at System.Net.Http.HttpRequestMessageExtensions.CreateResponse[T](HttpRequestMessage request, HttpStatusCode statusCode, T value, HttpConfiguration configuration) at System.Net.Http.HttpRequestMessageExtensions.CreateResponse[T](HttpRequestMessage request, HttpStatusCode statusCode, T value) at MyFunctionApp.MyHttpTriggerFunction.d__1.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult() at MyFunctionAppUnitTest.MyHttpTriggerFunctionTest.d__2.MoveNext() in C:\Users\rsingh\Desktop\Git_Workspace\ActivationAPI\MyFunctionAppUnitTest\MyHttpTriggerFunctionTest.cs:line 53 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.VisualStudio.TestPlatform.MSTestAdapter.PlatformServices.ThreadOperations.ExecuteWithAbortSafety(Action action) Result Message: Test method MyFunctionAppUnitTest.MyHttpTriggerFunctionTest.MyHttpTriggerFunction_SuccessResult threw exception: System.InvalidOperationException: The request does not have an associated configuration object or the provided configuration was null.

我是不是错过了一些微不足道的事情

Answer 1

错误消息告诉您问题所在。

The request does not have an associated configuration object or the provided configuration was null.

在 httpserver 外部测试请求时，您需要为请求提供 HttpConfiguration。

// Arrange.
var configuration = new HttpConfiguration();
var request = new System.Net.Http.HttpRequestMessage();
request.Properties[System.Web.Http.Hosting.HttpPropertyKeys.HttpConfigurationKey] = configuration;

//...other code