CompleteWithinAsync with AssertionScope will wait task to return value

[xzxzxc]

Description

In the case of using AssertionScope with the CompleteWithinAsync method over the delegate that returns a task with a result (Task<T>), the method will wait until the task is completed.

Complete minimal example reproducing the issue

using var _ = new AssertionScope();
var someAsyncWork = async () =>
{
    while (true)
        await Task.Delay(20.Milliseconds());

    return 1;
};

await someAsyncWork.Should().CompleteWithinAsync(500.Milliseconds());

Expected behavior:

The CompleteWithinAsync method will throw an exception in a decent period of time.

Actual behavior:

Execution stucks in the infinite loop.

Versions

I'm using FluentAssertions 6.7.0 with net6.0.

Additional Information

Issue disappears with one of the following changes:

• remove usage of the AssertionScope;
• remove return statement from the someAsyncWork (change the type of the delegate from Func<Task<T>> to Func<Task>).

[lg2de]

@dennisdoomen, I'll take care. Please assign this issue to me.

[lg2de]

Hey @xzxzxc , sorry for strong delay!
Today I finally tried to reproduce. I guess, it was already fixed while refactoring in #1967.
Please check again with version 6.8.0. At least I cannot reproduce anymore.

[xzxzxc]

@lg2de thank you!
I can confirm, the issue is fixed in the 6.8.0.