Added Message test structure, as well as a few initial tests.
Added Message test structure, as well as a few initial tests.

RewardGateway/Fetch,Mika56/Fetch,muxx/Fetch,Mika56/Fetch,dharyk/Fetch,deemyboy/Fetch,tomsommer/Fetch,dharyk/Fetch,kevinsmith/Fetch,deemyboy/Fetch,rbridge/Fetch,muxx/Fetch,ApexWire/Fetch,benr77/Fetch,ApexWire/Fetch,tomsommer/Fetch,kevinsmith/Fetch,rbridge/Fetch,RewardGateway/Fetch,benr77/Fetch