go tool cover -mode set cmd/sum/sum/sum.go
go test -c ./cmd/server/. -cover -covermode=set --coverprofile=coverage.out -coverpkg=./...
./server.test -test.coverprofile coverage.out
go tool cover -html=coverage.out
go tool cover -mode set cmd/sum/sum/sum.go
go test -c ./cmd/server/. -cover -covermode=set --coverprofile=coverage.out -coverpkg=./...
./server.test -test.coverprofile coverage.out
go tool cover -html=coverage.out