To Jupiter And Beyond - On An Exploratory Mission With JUnit Pioneer

JUnit Pioneer gathers JUnit 5 extensions. This talk discusses the technical aspects, but also the mission, dev practices, automatic releases, and what Twitch has to do with all of this.

Space helmet with white lights in the background

JUnit is a huge success and JUnit 5 is an amazing overhaul of a tried-and-true formula. One of its most enticing new designs is its extension model, which is where JUnit Pioneer comes in. It's a small project gathering all kinds of extensions.

In this talk, we're going to take a close look at the project and we won't just stick to the technical aspects:

  • JUnit 5 and its extension model
  • Pioneer's extensions
  • Pioneer's mission statement
  • how live-streaming on Twitch grew a community
  • organizational style, contribution guide
  • code style, Git practices, release considerations
  • how we use Shipkit and GitHub actions for one-click releases

If you're maintaining your own small open source project or are interested in a peek behind the scenes, this talk is for you.

Sketch notes of the presentation

(Amazing sketch notes were created by Johannes Dienst 🐦. 🤩)


Here's the current version of the slides.

I also embedded them below. If they're focussed, you can navigate with arrow keys or swipes (they're two-dimensional, with chapters on the horizontal axis and chapter content layed out vertically). Use Page Up/Down for linearized order and ? for more shortcuts.


Here's a good recording of the talk. I hope you'll like it.

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Past Presentations

I gave this talk a few times before. See below for links to slides (as they were at that very event), videos, and other information.