Mock verification in Kotlin using MockK and Atrium

I have been working with Kotlin a lot lately. It is a really awesome language. Elegant, powerful and succinct, it fixes most of the annoyances that I had with Java, yet it keeps a certain amount of familiarity that allows the transition from it to be very manageable.

Anyhow, I found myself recently having to build a filter in SpringBoot that I wanted to test. For that I needed to use both a mock and verify that behavior at the same time. Kotlin is evolving quite fast and there are plenty of alternatives to choose from. I will show how to do…