RFR: 8369049: [TestBug] Update JUnit to Version 6.0.0

[Kevin Rushforth]

On Thu, 2 Oct 2025 15:45:33 GMT, Marius Hanl <mhanl at openjdk.org> wrote:

> JUnit 6.0.0 is out and we can consider updating to it.
> 
> Release Notes: https://docs.junit.org/current/release-notes/index.html#release-notes-6.0.0
> 
> Notes:
> - Java 17 is the baseline (so not a problem for us, since we have a higher baseline)
> - Deprecation were removed (not a problem, as we don't rely on any)
> - JUnit Vintage Engine is deprecated (not a problem, as we dropped support for it some months ago)
> 
> JUnit 6 now uses a single version number for all dependencies, that is platform, jupiter and vintage (which we do not use anymore). That makes updating it easier.
> 
> It also uses `JSpecify`, which is an annotation library for `@NonNull` and `@Nullable`. All version numbers for JUnit now use a single variable.

@Maran23 This requires a new third-party library, which will need approval. Also, I'll need to review the PR.

Since you didn't make any changes to the test source code, I presume that JUnit 6 is compatible with 5 (leaving aside the removed deprecations, which don't affect us), unlike the transition from 4 to 5 (version 5 was effectively an entirely new API). I'll take a look at the release notes, but can you summarize the changes you are aware of?

Reviewers: @kevinrushforth @arapte @tiainen or @johanvos

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PR Comment: https://git.openjdk.org/jfx/pull/1925#issuecomment-3361994043