Testcontainers library is a perfect tool for providing Docker containers with external components from an integration test class level. With this tool, we are able to check how our codebase behaves with a real-life external system. But running an instance of a container for every test class sounds like poison…

Sometimes when I needed to write integration tests, I was forced to mock an external system or service from the java tests level. It wasn’t enjoyable and what is more, it required spending many hours on creating a codebase which tried to behave like a real system. It is dangerous…