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

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