go-sqlmock VS NATS

For that, I used the lib go-sqlmock. So, for example, the following snippet is part of the person/service_test.go file:

It's not the right call IMO to skip mocking the database connection to achieve 100% test coverage. How your app will behave in failure scenarios that are impossible to imitate during integration tests is part of the software contract. If your choice is to panic, or return an error, document that by testing that behavior. If another dev, or future you inadvertently breaks the contract, the test suite will fail. That's what you want. For unit tests against your database you should be using either go-sqlmock if testing against database/sql or pgxmock if testing against pgx. That being said, the points raised elsewhere in this thread regarding unit tests potentially hiding edge cases in terms of how an actual database will interact with your application that are not reflective of your understanding when writing mocks are 100% valid. You should do both. Unit test your app and write integration tests as well. On my team, we run integration tests using docker-compose.

I use Sqlmock for that purpose

There is a good lib for db tests https://github.com/DATA-DOG/go-sqlmock

nats: Golang client for NATS, the cloud native messaging system

Install the nats.go package

Now that our NATS server is running, we'll be using Go and Node.js clients to connect to it for simple demonstration. Not familiar with Go or Node? Don't worry NATS has clients available in over 40 languages!

You can build monolith applications and if they need cross communication, rely on something like Nats: https://github.com/nats-io/nats.go

You could start by looking/reading how it is implemented in production ala https://github.com/nats-io/nats.go