public void AddMarker()
{
_liveSequence.Subscribe();
_liveSequence.Add(Completable.Never());
_liveSequence.AddAction(Assert.Fail);
var instant = _liveSequence.AddInstant();
_liveSequence.AddAction(() => _value = 2);
AssertValue(0);
_liveSequence.SkipBefore(instant);
AssertValue(2);
}