go-sqlmock VS gomemcache

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

The library I will be using in this article as a Memcached client is gomemcache as it is quite simple to configure and use.

In cases where there's no de-facto package used for mocking calls, we could define our own interface type that happens to be defining the concrete calls we use in your code, for example if we are planning to mock memcached calls and github.com/bradfitz/gomemcache it's being used, then something like the following could work:

Understanding the nuances behind when and how to use caching is important when building microservices, in this post I will discuss general concepts about caching, some concrete details about memcached and I will cover the de-facto package for using memcached in Go: github.com/bradfitz/gomemcache.