private static void Setup(
out List <string> logLines,
out IWriteBuffer <char> writeBuffer,
out BlockingLoggingProducer blockingLoggingProducer,
out ProducerWrapper <char> producer,
CancellationTokenSource cts = null)
{
CancellationToken token = cts == null ? CancellationToken.None : cts.Token;
logLines = new List <string>();
ILogger log = MemoryLog.Create(logLines);
// use a regular logging producer unless an override is passed in
var factory = new BlockingLoggingProducerFactory(log);
blockingLoggingProducer = factory.Instance;
var channel = new UnboundedChannelFacade <char>();
producer = new ProducerWrapper <char>(factory, token, channel);
writeBuffer = channel;
}