Testcontainers is an open source library for providing throwaway, lightweight instances of databases, message brokers, web browsers, or just about anything that can run in a Docker container.

In many other languages, you have to not only evaluate testing libraries, but also write your tests in a style that complies with that library’s expectations. Gophers are blessed to have a thoroughly adequate solution out-of-the-box, and even further blessed to have an active ecosystem where folks are making in-depth testing a walk in the park.