#JUnit 6.0.0-RC2 is ready for testing!

📰 Everything in 6.0.0-M1, 6.0.0-M2, and 6.0.0-RC1
🐞 Minor enhancements and bug fixes since 6.0.0-RC1

https://junit.org/junit5/docs/6.0.0-RC2/release-notes/

✨ New blog post: "STF Milestone 6: Improved Kotlin support"

#JUnit 6.0.0-RC1 improves JUnit's #Kotlin story by adding support for suspending functions, sequences, contracts and nullness annotations.

👉 https://marcphilipp.de/blog/2025/08/21/stf-milestone-6-improved-kotlin-support/

Thanks to the @sovtechfund for their support!

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object ImprovedKotlinSupportTests { val data = sequenceOf( // Sequence<T> support arguments(1, Month.JANUARY), arguments(12, Month.DECEMBER) ) @ParameterizedTest @FieldSource("data") // suspending function support for coroutine testing suspend fun test(value: Int, month: Month?) { assertNotNull(month) // contracts to support... assertEquals(value, month.value) // smart casts! } }

#JUnit 6.0.0-RC1 is ready for testing!

📰 Everything in 6.0.0-M1 and 6.0.0-M2
🏷 Improved display names for parameterized classes/tests
♻ `MethodOrderer.Default` and `ClassOrderer.Default` for `@Nested` classes

https://junit.org/junit5/docs/6.0.0-RC1/release-notes/

✨ New blog post: "STF Milestone 5: Discovery issues"

Ever written a test that wasn't being executed? 😱

#JUnit 5.13 introduced a mechanism for reporting such issues found during test discovery.

👉 https://marcphilipp.de/blog/2025/08/16/stf-milestone-5-discovery-issues/

Thanks to the @sovtechfund for their support!

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@Test // Java int test() { return 42; } // Not executed!!! 😱😱😱

#JUnit 6.0.0-M2 is ready for testing!

📰 Everything in 6.0.0-M1
🛑 Support for cancelling test execution
⏭️ New `--fail-fast` mode for ConsoleLauncher
🦺 Null-safe `computeIfAbsent` methods for stores
🧐 Strict evaluation of enum-based configuration parameters

https://junit.org/junit5/docs/6.0.0-M2/release-notes/

#JUnit 5.13.4 is released!

🐞 Bug fixes and minor improvements

https://junit.org/junit5/docs/5.13.4/release-notes/

#JUnit 5.13.3 is released!

🐞 Bug fixes and minor improvements

https://junit.org/junit5/docs/5.13.3/release-notes/

If you ever need to adapt a #JUnit3 TestSuite to run directly in #JUnit #Jupiter, it's actually possible with dynamic tests! 😎

Here's how I run the @⁠Inject TCK in the @SpringFramework.

https://github.com/spring-projects/spring-framework/blob/main/spring-context/src/test/java/org/springframework/context/annotation/jsr330/SpringAtInjectTckTests.java

Kudos to @marcphilipp for suggesting the dynamic test idea.

#JUnit 6.0.0-M1 is ready for testing!

✨ Require Java 17 and Kotlin 2.2
🌄 JSpecify nullability info
🚟 Kotlin suspend function support
🛫 Integrated custom JFR events
🚅 FastCSV-backed Csv{File}Source
🧹 Remove deprecated APIs and behaviors

https://junit.org/junit5/docs/6.0.0-M1/release-notes/

#JUnit Logo Contest Update

Here are some of the top contenders.

Please let us know your thoughts.

And additional proposals are welcome!

https://github.com/junit-team/junit-framework/issues/4576

So happy that @marcphilipp got accepted into the @JavaChampions program. Congratulations!

There are more people on the #JUnit core team that did so much of incredible value to the ecosystem, they literally walking the talk.

⚠️ It's official: the #junit5 GitHub repository is gone!

Well, actually... it's only been renamed to #junit-framework. 😎

Plus, everything should redirect fine. 🙈

https://github.com/junit-team/junit-framework

We really need a new #JUnit logo! 🤣

Proposals are welcome!

https://github.com/junit-team/junit5/issues/4576

✨ New blog post: "STF Milestone 4: Parameterized test classes"

#JUnit 5.13 introduced parameterized test classes (in addition to methods). They are a powerful testing tool that has long been missing from JUnit Jupiter. I’m super happy that I’ve finally had the chance to resolve this long-standing and highly-voted issue thanks to the @sovtechfund.

👉 https://marcphilipp.de/blog/2025/06/07/stf-milestone-4-parameterized-test-classes/

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@ParameterizedClass @ValueSource(strings = {"foo", "bar"}) class SomeTests { @Parameter String value; @Test void shouldNotBeNull() { assertNotNull(value); } @Test void lengthShouldBeThree() { assertEquals(3, value.length()); } }

#JUnit 5.13.1 is released!

🐞 Fix regressions introduced in 5.13.0

https://junit.org/junit5/docs/5.13.1/release-notes/

The slides and code examples for my talk about #JUnit at #IntelliJIDEAConf are now available on https://marcphilipp.de/en/talks/

#JUnit 5.13.0 is released!

🪄 ClassTemplate and ParameterizedClass support
⚠️ Discovery issue reporting for test engines
♻️ Resource management for launcher sessions and execution requests
🔍 Test discovery support in EngineTestKit
👾 ConsoleLauncher improvements

https://junit.org/junit5/docs/5.13.0/release-notes/

Zero open issues for #JUnit 5.13 GA!

Something may be brewing... ☕️

https://github.com/junit-team/junit5/milestone/94

The #JUnit team is looking for ideas and proposals for a new logo for the upcoming JUnit 6.0 release!

Please see https://github.com/junit-team/junit5/issues/4576 for ground rules.

We are looking forward to your comments and submissions!

So, do you still think that #JUnit 5 is "the new" thing?

It quite isn't.

The crowdfunding campaign for JUnit Lambda was ten years ago this year.

When @sormuras and I realised that last week at #JCON that made me feel old.

JUnit still rocks, though. Great #Java framework.

#JUnit 5.13.0-RC1 is ready for testing!

🪄 ClassTemplate and ParameterizedClass support
⚠️ Discovery issue reporting for test engines
♻️ Resource management for launcher sessions and execution requests
🔍 Test discovery support in EngineTestKit
🐞 Bug fixes and minor improvements

https://junit.org/junit5/docs/5.13.0-RC1/release-notes/

#JUnit 5.12.2 is released!

🐞 Fix regression when using CleanupMode.ON_SUCCESS

https://junit.org/junit5/docs/5.12.2/release-notes/

#PairProgramming (if you'd like to) #TDD #JUnit5 #Kotlin #Java

✨ New blog post: "STF Milestone 3: Release verification and automation"

A major goal of the @sovtechfund is to help projects become more sustainable and decrease their truck factor. For #JUnit, one activity in desperate need of improvement in this area was performing a release. Prior to this milestone, all JUnit releases of the past years had been performed from my local computer. It was high time to change that!

https://marcphilipp.de/blog/2025/04/01/stf-milestone-3-release-verification-and-automation/

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screenshot of GitHub Actions workflow chart