Now the @jugch in Zurich knows what's wrong with AssertJ! 😄 And also how we're working to improve things. We're still in the early stages and there's a lot cooking, but I can't wait to see all this work shipped to our users 🚀
Thank you so much to everyone who attended and @patbaumgartner for hosting the event! I had a blast!
Less than a week to go! 🚀
Join me this Tuesday at PH Zürich to discover how AssertJ 4 is about breaking things (carefully) to make your testing life better.
Come for the technical debt, stay for the drinks and networking! 🍻
AssertJ has been a player in Java testing for over a decade, providing an intuitive set of strongly typed assertions designed to maximize test readability. Since the launch of version 3.0, the library has undergone a massive expansion to support a wide range of use cases, specialized JDK types, and technologies like Guava and databases. However, this extended period of growth has resulted in a significant accumulation of technical debt and architectural friction that cannot be fully resolved while maintaining backward compatibility.
Here's what you'll find out of the box:
🍃 @SpringConversion → Tap into Spring Framework's type conversion directly in your test arguments
🔢 @Bytes, @Base64, and @Hex → Decode strings and numbers directly into the byte arrays your productive code expects
I’d love to get your feedback! If you have a specific use case where another custom converter could help, get in touch!
This week, from the venue of Spring I/O, I've open-sourced a new library to make data-driven testing in Java a little bit easier: JUnit Converters!
I'm a huge fan of data-driven and parameterized testing, and I always want to keep test code as readable and maintainable as production code. JUnit Converters helps you with it with a collection of ready-to-use argument converters for JUnit 6 (and 5!).
🧵
📢 AssertJ joined the GitHub Secure Open Source Fund, a program that leveled up security across 67 open source projects.
What changed for us: SHA pinning, immutable releases, incident response plan, and a mindset shift toward security awareness 🔒
The impact? More robust JVM assertions 🚀
📢 AssertJ 3.27.7 has been released!
This fixes CVE-2026-24400 🔒
Happy assertions!
https://github.com/assertj/assertj/releases/tag/assertj-build-3.27.7
Last but not least, the test suite is now much stronger as the relevant JSON marshalling is black-box tested.
If you're curious about the details, take a look at this PR 👇
https://github.com/spring-projects/spring-batch-extensions/pull/196
Jackson doesn't really need any introduction, and I lost track of how many times I wondered, "Can I really do this with Jackson?!"
After the changes, how the extension communicates with Notion is fully an implementation detail, tailored to its scope and no longer exposed to users. All public types are now decorated with Jackson annotations, and there is no need for an intermediate layer to handle request & response conversion.
Sam Brannen
