public void Setup()
{
// arrange - setup nlog
LoggingConfiguration config = new LoggingConfiguration();
_memoryTarget = new MemoryTarget { Layout = @"${level} ${message}" };
config.AddTarget("memory", _memoryTarget);
LoggingRule rule = new LoggingRule("*", LogLevel.Trace, _memoryTarget);
config.LoggingRules.Add(rule);
LogManager.Configuration = config;
// arrange - setup logger
_logger = new NLogLogger("memory");
}