执行测试时出错，如果对 return Azure Function HttpResponseMessage 使用 CreateResponse 扩展方法

Question

我的 Azure Function 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);

执行函数后，当它尝试return结果变量中的响应时，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） return 如下所示的响应，我在测试方法中得到响应并且测试用例运行正常。

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.

我是不是遗漏了一些微不足道的东西

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 之外测试请求时，您需要给请求一个 HttpConfiguration.

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

//...other code

Answer 2

这并非特定于 Azure Functions，但为了在实际 HTTP 请求的上下文之外执行此测试，您需要确保创建一个 HttpConfiguartion 实例，并根据需要对其进行配置（例如添加您可能需要的任何格式化程序）并使用该对象在 HttpRequestMessage 实例上调用 SetConfiguration。

示例：

var configuration = new HttpConfiguration();
var request = new HttpRequestMessage();
request.SetConfiguration(configuration);