public void Can_store_and_read_checkpoint(long?checkpoint)
{
_checkpointStore.Write(checkpoint);
var returned = _checkpointStore.Read();
returned.ShouldBe(checkpoint);
}
public async Task Commit(CancellationToken cancellationToken = default(CancellationToken))
{
await _inner.Commit(cancellationToken).ConfigureAwait(false);
_checkpointStore.Write(_lastCheckpoint);
}