I use existing libs and tools :

• Ozzo Validation, for input request validation
• Godotenv, for env loader
• jmoiron/sqlx for postgres driver
• postgresql for DB

cd ex_service go mod tidy make changes in the .env file as the requierement there

i've made several unit testing but just in usecases layer go to the each usecase package you want to testing then run a command "go test" you can see the coverage testing in each usecase package by open the project with vscode, choose the testing file, right click then choose "Go:Toogle Test Coverage in Current Package"

after set the .env file with your database and redis credential, then stay still in root directory, then do "go run main.go" in terminal