TimerMock does not wait for time to advance before invoking callback

[cyungmann]

Sample code (using .NET 10.0 and Testably.Abstractions.Testing 6.1.0):

using Testably.Abstractions.Testing;

var time = new MockTimeSystem(o => o.DisableAutoAdvance());
Console.WriteLine($"original: {time.DateTime.UtcNow}");
using var timer = [time.Timer.New](http://time.timer.new/)(
    _ => Console.WriteLine($"from callback: {time.DateTime.UtcNow}"),
    null,
    TimeSpan.FromSeconds(5),
    Timeout.InfiniteTimeSpan);
await Task.Yield();
Console.WriteLine($"before advance: {time.DateTime.UtcNow}");
time.TimeProvider.AdvanceBy(TimeSpan.FromSeconds(6));
Console.WriteLine($"after advance: {time.DateTime.UtcNow}");

Console.WriteLine("*********************************");

Console.WriteLine($"original: {DateTime.UtcNow}");
using var timer2 = new Timer(
    _ => Console.WriteLine($"from callback: {DateTime.UtcNow}"),
    null,
    TimeSpan.FromSeconds(5),
    Timeout.InfiniteTimeSpan);
await Task.Yield();
Console.WriteLine($"before advance: {DateTime.UtcNow}");
await Task.Delay(TimeSpan.FromSeconds(6));
Console.WriteLine($"after advance: {DateTime.UtcNow}");

Console.ReadKey();

Output:

original: 6/2/2012 7:45:20 AM
from callback: 6/2/2012 7:45:20 AM
before advance: 6/2/2012 7:45:20 AM
after advance: 6/2/2012 7:45:26 AM
*********************************
original: 4/9/2026 5:07:24 PM
before advance: 4/9/2026 5:07:24 PM
from callback: 4/9/2026 5:07:29 PM
after advance: 4/9/2026 5:07:30 PM

If new TimerStrategy(TimerMode.StartOnMockWait) is used, then the callback is never invoked at all.

[vbreuss]

Thanks for reporting, @cyungmann. I found the issue and will release a fixed version shortly.

[github-actions]

This is addressed in release v6.2.0.