Exceptions in async void step definitions are swallowed in SpecFlow v4 beta

[gasparnagy]

SpecFlow Version

4.0 beta

Which test runner are you using?

xUnit

Test Runner Version Number

2.4.2

.NET Implementation

.NET 6.0

Project Format of the SpecFlow project

Sdk-style project format

.feature.cs files are generated using

SpecFlow.Tools.MsBuild.Generation NuGet package

Test Execution Method

Visual Studio Test Explorer

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

n/a

Issue Description

When an expection (e.g. assertion) is thrown from an async void step definition, the exception is caught by SpecFlow and the test shows an incorrect "pass" state.

Steps to Reproduce

[Then("something")]
public async void ThenSomething()
{
    Assert.Equal(1, 2); // throws exception
    await Task.Delay(10);
}

Link to Repro Project

https://github.com/gasparnagy/issue-repro-specflow-2600

[gasparnagy]

@SabotageAndi Maybe we should not allow async void step definitions at all in SpecFlow v4?

[SabotageAndi]

Good idea! Let's do it!

[github-actions[bot]]

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