Add some fields adapter tests
Add some fields adapter tests

mgranberry/ttn,jvanmalder/ttn,LoRaWanSoFa/ttn,LoRaWanSoFa/ttn,TheThingsNetwork/ttn,jvanmalder/ttn,TheThingsNetwork/ttn,TheThingsNetwork/ttn,mgranberry/ttn,mgranberry/ttn,jvanmalder/ttn