I had a blast at JUG Lucerne, with a small but engaging crowd whom I spent almost three hours with! 😍 What stuck with me the most: • AssertJ should be renamed to AssertJoy • They would love a hands-on follow-up with more advanced use cases Many thanks again to @mcpringle.bsky.social for having me!

Stefano Cordio@scordio.github.io · last mo.

No good weather today 🌧️ ☔ so why not join me in JUG Lucerne and find out what a handful of developers are doing to ship the next major version of AssertJ? 🧑‍💻 www.jug.ch/html/events/...

No good weather today 🌧️ ☔ so why not join me in JUG Lucerne and find out what a handful of developers are doing to ship the next major version of AssertJ? 🧑‍💻 www.jug.ch/html/events/...

Now the Java User Group in Zurich knows what's wrong with AssertJ! And also how we're working to improve things. We're still in the early stages, but I can't wait to see all this work shipped to our users 🚀 Thank you so much to everyone who joined and @patbaumgartner.com for hosting! 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! 🍻 www.jug.ch/html/events/...

Good morning @jcon.one ! For the most dedicated audience there's a 9AM testing talk. 😅 See you there!

Excited for #JCON EUROPE 2026? See Tim te Beek at #JCON2026 in Cologne talking about 'Better Assertions with #AssertJ' Not all testing #libraries are equal. Sure they all run your #tests, but what happens when they fail? “Expected ‘true’, … 🎟️ 2026.europe.jcon.one/tickets Free for #JUG members

📢 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 🚀

#OpenRewrite v8.73.0 is out! 🍰 🐍 Python 2 parser + Python 3 recipes 🐳 Docker parser + recipes 🍂 Propagate Maven parent POM changes 🧪 New AssertJ and Mockito recipes 🔌 Apache HttpAsyncClient 4→5 🏛️ Struts 1→2→5→6→7 recipes 🧙 Dropwizard 5.0 migration 🐛 Tons of fixes github.com/openrewrite/...

Release 3.24.0 · openrewrite/rewrite-recipe-bom

What's Changed Incorporates the latest versions of OpenRewrite (v8.73.0), the rewrite-gradle-plugin (v7.26.0), and the rewrite-maven-plugin (v6.29.0) to improve code parsing accuracy and recipe ex...

github.com

📢 AssertJ 3.27.7 has been released! This fixes CVE-2026-24400 🔒 Happy assertions! github.com/assertj/asse...

Release v3.27.7 · assertj/assertj

🔒 Security Core Fix XXE vulnerability in isXmlEqualTo assertion (CVE-2026-24400) See GHSA-rqfh-9r24-8c9r for details; many thanks to @wxt201 and @Song-Li for responsibly reporting it! 🚫 Deprec...

github.com

🚀 New update: AssertJ support in Testcontainers Mailpit I just added AssertJ assertions to my Testcontainers Mailpit project. You can now write fluent assertions instead of low-level checks. 🔗 GitHub: github.com/martinellich... Feedback is welcome 👍

GitHub - martinellich/testcontainers-mailpit

Contribute to martinellich/testcontainers-mailpit development by creating an account on GitHub.

github.com

This video is still relevant: “AssertJ — Use It Now!” 🚀 If you write Java tests, this one’s for you. Learn how AssertJ can make your assertions cleaner, clearer, and more powerful. Watch now: youtu.be/qn4AMKTPpg8 #Java #Testing #AssertJ #CleanCode #DevTips

AssertJ use it now

YouTube video by Mike Møller Nielsen

youtu.be

🤔 Who said that AssertJ 3 is in maintenance mode? 📢 We're planning an exceptional 3.28 release – let us know what you'd like to see in there! 👇 github.com/orgs/assertj...

#OpenRewrite v8.68.1 is out! 🛬 🌱 Spring Boot 4.0: additional properties & dependencies 🍃 Migrate Spring Retry to Resilience 🧪 Hamcrest to AssertJ & JMockit to Mockito fixes 🟢 Node 22/24 upgrade recipes: fs, zlib, crypto & more 🤠 Jackson v3: migrate modules & feature flags github.com/openrewrite/...

Release 3.20.0 · openrewrite/rewrite-recipe-bom

What's Changed Incorporates the latest versions of OpenRewrite (v8.68.1), the rewrite-gradle-plugin (v7.22.0), and the rewrite-maven-plugin (v6.25.0) to improve code parsing accuracy and recipe ex...

github.com

Instead of buying more stuff that I don’t really need, I’m sponsoring open source #Java projects that I rely on, starting with #JUnit and #AssertJ (via core maintainers Joel and Stefano). If I was a big company using Java, I’d be embarrassed at not sponsoring these projects.

Many thanks to you, @mcpringle.bsky.social, and Alexandra, for the amazing organization! 🙏 So many new contributors to @assertj.github.io in a single day! github.com/hack-commit-...

Add AssertJ contributions by scordio · Pull Request #7 · hack-commit-push/switzerland2025

github.com

🤔 Who said that AssertJ 3 is in maintenance mode? 📢 We're planning an exceptional 3.28 release – let us know what you'd like to see in there! 👇 github.com/orgs/assertj...

Hack.Commit.Push Switzerland is just one week away! 🇨🇭 This is a great opportunity to get involved in Open Source projects like @assertj.github.io, with direct guidance from the maintainers!

Andres Almiray@andresalmiray.com · 11mo ago

The next edition of Hack.Commit.Push Switzerland🇨🇭will take place in Rotkreuz LU this November 22nd. Care to join us for some Open Source hacking? It’s for a good cause! switzerland2025.hack-commit-pu.sh

Sur le blog de #norsys, mon collègue Kelean vient de publier un billet qui présente @assertj.github.io et comment le mettre à profit pour améliorer ses tests unitaires. medium.com/norsys-octog... #JUnit #AssertJ #Java #Test #TestUnitaire

Our next meetup will take place on November 4th at ING Leeuwarden to help you improve your testing with @timtebeek.github.io covering AssertJ and @simoneromani.bsky.social mutating tests for more confidence. Sign up at www.meetup.com/jug-noord/ev... !

It's great to see the community actively watching over the early development of AssertJ 4!

Jfokus@jfokus.se · 10mo ago

🧪 Deep Dive Monday at #Jfokus - Break Your Testing Habits with Tim te Beek & Rick Ossendrijver Unlearn the old, master the new - JUnit 6, AssertJ 4 & modern testing practices. Forge your path in the halls of code ⚡ 👉 www.jfokus.se #DeveloperConference #Java #Testing #JUnit #AssertJ #CleanCode

btw, if you run a user group/meetup and want me to present any of my talks (on Testable Architecture, Event Sourcing, etc.) to your group (remotely or in person in the SF Bay Area), let me know! See my Ted Talks page: ted.dev/talks #Java #EventSourcing #JUnit #AssertJ

Many thanks to our new sponsor, LambdaTest! www.lambdatest.com

LambdaTest - AI Powered Testing Tool | AI Testing Agents On Cloud

Power your software testing with AI and cloud. Test intelligently, deploy and scale faster with LambdaTest unified testing platform.

lambdatest.com

📢 AssertJ 3.27.6 has been released! This fixes a 🐛 regression related to the module descriptor 🧩 Happy assertions! github.com/assertj/asse...

Release v3.27.6 · assertj/assertj

🐛 Bug Fixes Core Add missing export for org.assertj.core.annotation #3951 ❤️ Contributors Thanks to all the contributors who worked on this release: @duponter

github.com

📢 AssertJ 3.27.5 has been released! This 🛠️ upgrades ByteBuddy to its latest version to ensure smooth compatibility with Java 25 ☕ Happy assertions! github.com/assertj/asse...

Release v3.27.5 · assertj/assertj

⚡ Improvements Core ByteBuddy in AssertJ 3.27.4 not compatible with Java 25 #3946 🔨 Dependency Upgrades Core Upgrade to Byte Buddy 1.17.7 #3947 Upgrade to JUnit BOM 5.13.4 #3947 Guava Upgrade ...

github.com

Messy tests make messy code. In this session @ted.dev shows how to refactor JUnit tests with AssertJ, builders & patterns to keep them clear, lean & powerful. 🚀 www.dev2next.com/speaker/af08... 🎟️ Secure tickets at dev2next.com 👀 Use code JOIN-TED-M.Y-50OFF for a discount!

🍃 Better Assertions with AssertJ by @timtebeek.github.io @ Spring I/O 2025 ▶️ Video: youtu.be/k7sXn1v4fYc 🔗 Slides: 2025.springio.net/slides/bette... 🛠️ Repo: github.com/timtebeek/be... #springio25

Better Assertions with AssertJ by Tim te Beek @ Spring I/O 2025

YouTube video by Spring I/O

youtu.be

Hard assertions = fast feedback ✅ But when one failure hides others, you lose valuable insight. 😥 Here’s how to use custom soft assertions with AssertJ to make your tests graceful, readable, and thorough: eliasnogueira.com/assert-with-... #java #testing #quality

Assert with Grace: Custom Soft Assertions using AssertJ for Cleaner Code - Elias Nogueira

Introduction If you don't know what a soft assertion is, please read Soft Asserts – Why should you use them for Unit and Integration tests? This article is a continuation of Assert with Grace: Custom…

eliasnogueira.com

Last morning talk at #KCDC2025: @jeanneboyarsky.bsky.social is teaching us about testing beyond JUnit. Here, she’s covering @assertj.github.io

Excited to return to @devoxx.com with @rickossendrijver.bsky.social ! See you there to modernize your test suite 🚀

📢 AssertJ 3.27.4 has been released! This fixes a 🐛 regression introduced in 3.26.0, brings a few minor 🚫 deprecations, and paves the way for ⚡ smoother NullAway integration. Happy assertions! github.com/assertj/asse...

Release v3.27.4 · assertj/assertj

🚫 Deprecated Core Deprecate org.assertj.core.annotations.Beta in favor of org.assertj.core.annotation.Beta Deprecate org.assertj.core.util.CanIgnoreReturnValue in favor of org.assertj.core.annotat...

github.com