安装gomock：

   go get github.com/golang/mock/gomockgo get github.com/golang/mock/mockgen

使用 mockgen 生成 mock 代码: 参考

   mockgen -source=service/user.go -destination=service
/mocks/mock_user_service.go -package=mocks

go test -coverprofile=coverage.out && go tool cover -func=coverage.out

go test -coverprofile=coverage.out ./... &&
go tool cover -func=coverage.out | grep treasury.go

测试单个文件

go test -coverprofile=coverage.out ./... &&
go tool cover -func=coverage.out | grep treasury.go