public async Task Initialize_event_position_to_event_store_current_global_stream_position_when_first_time()
{
const long currentPosition = 1500000L;
_eventPositionRepository.GetLastProcessedPosition().Returns((long?)null);
_eventStore.GetCurrentGlobalStreamPosition().Returns(currentPosition);
await _aggregator.StartAggregation(new CancellationToken(false));
await _eventPositionRepository.Received(1).Save(currentPosition);
}
