I’ve always been more of a fan of unit tests than integration tests, mainly for one reason: I don’t need anything external to be able to run them. I don’t need to have a database started, an external service to connect to, or a Kafka running to be able to run the tests and therefore to be able to develop.
That’s in the development environment, but if we’re talking about the integration environment, then I won’t even start. For example, in the case of databases, we have the option of doing the tests with H2. But it is also true that depending on the type of project, it could be that something which works perfectly in H2 does not work in the database for which we are developing: As sure as we have often relied on: