[#1004] Isolate dependencies in repo/db/offlinemessages_test.go
[#1004] Isolate dependencies in repo/db/offlinemessages_test.go

OpenBazaar/openbazaar-go,hoffmabc/openbazaar-go,gubatron/openbazaar-go,hoffmabc/openbazaar-go,gubatron/openbazaar-go,OpenBazaar/openbazaar-go,gubatron/openbazaar-go,OpenBazaar/openbazaar-go,hoffmabc/openbazaar-go