can I somehow test the contents of a package

Hello, IM doing now this book to understand better the OOP side of Pharo : https://books.pharo.org/learning-oop/ im now at the last challenge of the network-simulator and im stuck. I want to test if the send package is really send back uppercase but I cannot find a way to see the contents of the package in my test I have made so far : https://github.com/RoelofWobben/network/blob/master/NetworkSimulator-Tests/K... Can anyone give me a hint how I can achieve what I want ? Regards, Roelof