Description

This is how I expect it to work, not sure if it's a bug, intentional or an oversight.

var advanceAmount = TimeSpan.FromSeconds(5);

var provider = new FakeTimeProvider
{
    AutoAdvanceAmount = TimeSpan.FromSeconds(5)
};

/// .. non test code

var startingTimestamp = provider.GetTimestamp();

/// ... things happening in between

var elapsedTime = provider.GetElapsedTime(startingTimestamp);

/// ... test code

// expected to be true but is 0
Assert.That(elapsedTime, Is.EqualTo(advanceAmount))

Reproduction Steps

As above ^^

Expected behavior

I would expect that when checking the elapsed time that it should match what is specified in AutoAdvanceAmount.

Actual behavior

The elapsed time is zero.

Regression?

No idea.

Known Workarounds

Currently I can work around the issue by advancing the timer myself in between the calls to GetTimestamp and GetElapsedTime.

Configuration

.NET 8

Other information

This shows that it just returns the number of ticks from now.

Maybe it needs to do something similar to