StepArgumentTransformation Async/Await support

[adison88]

I'm trying to implement async/await all the for transform method decorated with

Before

        [StepArgumentTransformation]
        public Device TransformDevice(Table table)
        {
            return this.TransformDevices(table).FirstOrDefault();
        }

After

        [StepArgumentTransformation]
        public async Task<Device> TransformDeviceAsync(Table table)
        {
            return (await this.TransformDevicesAsync(table)).FirstOrDefault();
        }

However, it fails and errors out while doing table to Device transform. The same synchronous version works fine. Would like to if async is supported all the way?

SpecFlow Version:

• [ *] 2.3

Used Test Runner

• Xunit

Version number:

Project Format of the SpecFlow project

• Classic project format using <PackageReference> tags

.feature.cs files are generated using

• SpecFlow.Tools.MsBuild.Generation NuGet package

Visual Studio Version

• VS 2019

Enable SpecFlowSingleFileGenerator Custom Tool option in Visual Studio extension settings

• Disabled

Are the latest Visual Studio updates installed?

• Yes

.NET Framework:

• >= .NET 4.5
• before .NET 4.5
• .NET Core 2.0
• .NET Core 2.1
• .NET Core 2.2
• .NET Core 3.0
• .NET Core 3.1
• .NET 5.0

Test Execution Method:

• Visual Studio Test Explorer

<SpecFlow> Section in app.config or content of specflow.json

Issue Description

Steps to Reproduce

Repro Project

[SabotageAndi]

Did you try it in SpecFlow 3.5? I am not sure when we added the first support for async/await.

[adison88]

No but as per https://stackoverflow.com/a/40038944 it was added in 2.2 so I thought it’d work.

[gasparnagy]

Analyzed and this is still a problem with v4.0 beta, because the transformation infrastructure does not realize that the method with return type Task<Device> can be used to get the parameter of type Device.

Looking into it...

[github-actions]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.