public void SignalAsyncReturnsFaultedTaskOnError()
{
var evt = new AsyncCountdownEvent(0);
#pragma warning disable CS0618 // Type or member is obsolete
var result = evt.SignalAsync();
#pragma warning restore CS0618 // Type or member is obsolete
Assert.True(result.IsFaulted);
Assert.IsType(typeof(InvalidOperationException), result.Exception.InnerException);
}