public string QuerySomething(QuerySomething query)
        {
            base.Handle <QuerySomething, string>(query);

            TestOutputHelper.WriteLine($"Query result: {query.Data}.");

            TestOutputHelper.WriteLine($"Instance #{_instanceCounter}.");

            return(query.Data);
        }
 public void ThisShouldNotBeAllowed(QuerySomething query)
 {
     _outputHelper.WriteLine(query.Data);
 }