[broker] Write tests for unsupported methods
[broker] Write tests for unsupported methods

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