Function Indexing Exception with WebJobs SDK for Integration Test

[kolexinfos]

I am trying to use the WebJobs SDK with the below configuration to run Integration Test for Azure Activity and Durable functions(v4, .Net6.0) as done here but running into the below exception .

Microsoft.Azure.WebJobs.Host.Indexers.FunctionIndexingException : Error indexing method 'ForceRefreshTrigger'
---- System.InvalidOperationException : Functions must return Task or void, have a binding attribute for the return value, or be triggered by a binding that natively supports return values.

When I change the Function return type to something different from IActionResult the Indexing seem to work without issues so I was wondering if this is the issue but it works using the Azure Functions SDK when I ran the same set of functions in Visual Studio(Azure Function Core Tools).

I also observed that when I remove the [DurableClient] IDurableOrchestrationClient durableClient, the function indexing also does not throw the above exception. So I am not sure what the root cause of this problem is looking at these 2 anomalies.

public static async Task<ActionResult> ForceRefreshTrigger(
      [HttpTrigger(AuthorizationLevel.Anonymous, "post"/{operations/refresh")] HttpRequest request,
        string orgId,
        string taskId,
        [DurableClient] IDurableOrchestrationClient durableClient)
{
	........................
}

functionsHost = new HostBuilder()
             .ConfigureAppConfiguration(builder =>
             {
                 builder.SetBasePath(Directory.GetCurrentDirectory())
                     .AddJsonFile("appsettings.taskfunction.json", optional: true, reloadOnChange: true);
             })
            //.ConfigureFunctionsWorkerDefaults()
            .ConfigureWebJobs(builder =>
            {
                builder.AddAzureStorageCoreServices();
                builder.AddAzureStorage();
                builder.AddTimers();
                builder.AddDurableTask(options =>
                {
                    options.HubName = this.taskHubName;
                    options.StorageProvider["type"] = "AzureStorage";
                    options.StorageProvider["connectionStringName"] = "AzureWebJobsStorage";

                });

            })
            .ConfigureServices(services =>
            {
		services.AddSingleton<ITaskResolverService>(this.tyeResolveService)
            })
             .Build();

 await this.functionsHost.StartAsync();

Repro steps

Provide the steps required to reproduce the problem

1. Create HttpTriggered or TimerTriggered function with the signature similar to the above.

2. Setup a WebJobs host builder configuration above

Expected behavior

The WebJobs SDK should run the Functions successfully

Actual behavior

Microsoft.Azure.WebJobs.Host.Indexers.FunctionIndexingException : Error indexing method 'ForceRefreshTrigger'
---- System.InvalidOperationException : Functions must return Task or void, have a binding attribute for the return value, or be triggered by a binding that natively supports return values.

Known workarounds

Change the return type but this would not work for my scenario as we have lots of functions with similar signature that we want to run Integration Test on.

Related information

Provide any related information

• Package version
  Microsoft.Azure.WebJobs.Extensions: 3.0.6
  Azure Function: v4
• Links to source

[bananamufu]

I'm experiencing the same issue. If you remove the binding, the function won't work in azure. If you keep it, the integration tests don't work.