AssertJ

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

When we started TestLens, we knew who we were building it for: teams that take their test suites seriously. So it means a lot that some of the most widely used testing projects in the JVM world now use TestLens on their own pull requests. 👉️ Read more: testlens.app/blog/2026/09... #java #junit

Our next #JCON2026 session is live: 'Better #Assertions with #AssertJ' with @timtebeek Not all #testing libraries are equal. Sure they all run your tests, but what happens when they #fail? “Expected ‘true’, was ‘false’” won’t help you … Grab your coffee and hit play: youtu.be/W7BhLNVHuqo

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!

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/...

🚀 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 👍

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

🤔 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/...

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-...

🤔 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!

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!

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

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

📢 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...

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

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...

Something is brewing ☕ github.com/assertj/asse...

OpenRewrite v8.59.1 is here! 🏖 ☸️ Parse Helm templates ⭐ Additional Groovy features 🧑‍🏫 More AssertJ best practices 🌀 Simplify annotation attributes 🪶 Tolerate invalid POMs ♻ Remove with Refaster 🔬 New static analysis recipes 🐞 Many smaller improvements & fixes github.com/openrewrite/...

Should we establish a dedicated space for the AssertJ community on Gitter? Cast your vote! github.com/orgs/assertj...

📆 Only two weeks until Hack.Commit.Push, on June 13th in Winterthur!🇨🇭 Join us for a day of learning, sharing, and contributing to Open Source 🧑‍💻 winterthur2025.hack-commit-pu.sh

FYI, if you need to compare 2 objects in a #java test, do not manually compare all fields by calling the getters. Instead, do it with 1 line of AssertJ: medium.com/@lucascalebe...

Join me in fifteen minutes for Better Assertions with AssertJ @springio.net room 5!

The Moderne world tour continues! ✈️ Next up, meet us at @springio.net ‬in beautiful Barcelona, May 22-23. 🤝 Don't miss @timtebeek.github.io's session, "Better Assertions with AssertJ" ☕ Details: 2025.springio.net/sessions/bet...

If you need a quick introduction to AssertJ-DB, my talk at Devoxx is available on youtube : youtu.be/XILu4r3rIEc #AssertJDB #AssertJ #tests

Learn to write unit tests for a #SpringBoot REST API endpoint that returns an object as JSON. This guide identifies the key tests, shows how to eliminate duplicate request building code, and demonstrates how to write the required assertions with MockMvcTester and AssertJ.

📆 One month left! Join us for a full day of open source on June 13th!

l'd be happy to help you get started with an AssertJ contribution, and there'll be other cool projects too-don't miss the opportunity!

A Practical Guide to Testing Spring Controllers With MockMvcTester blog.jetbrains.com/idea/2025/04...

OpenRewrite v8.50.2 is here! 🎉 🐘 Gradle Kotlin DSL recipes 🌟 Groovy parser improvements 🔀 Expand JavaTemplate & Refaster support 🧪 New recipes for AssertJ & JUnit 5 🍃 Recipes for Spring Framework 6.2 & Spring Batch github.com/openrewrite/...

And here we are! #VDZ25

I agree with what they said. Most of @spring.io uses AssertJ. Even some custom asserters too!

Have you looked into AssertJ? It's my favorite assertion library for Java, typesafe overloads of assertThat(...) make for great auto-completion.