fixes #251: Override & bump testing dependencies to enable some JUnit 5 tests

[Fishbowler]

• Bump the Openfire-inherited maven-surefire-plugin to enable JUnit 5 tests.
• Override and bump transitive Jupiter for more modern JUnit 5 dependencies
• Include JUnit Vintage to preserve JUnit 4 tests

Summary by CodeRabbit

• Tests
  • Added support for running JUnit 5 tests.
  • Preserved compatibility with existing JUnit 4 tests.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 84390f52-b8f8-49f4-b03b-316a8105b36a

📥 Commits

Reviewing files that changed from the base of the PR and between 9bbe621 and 31007fa.

📒 Files selected for processing (1)

• pom.xml

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The Maven configuration adds JUnit Jupiter and Vintage dependencies, defines their version, and configures Maven Surefire 3.6.0 for JUnit 5 execution while retaining JUnit 4 compatibility.

Changes

JUnit test execution

Layer / File(s)	Summary
Configure JUnit test runtime pom.xml	The build defines JUnit version 6.1.3, configures Maven Surefire 3.6.0, and adds test-scoped Jupiter and Vintage Engine dependencies.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 31007

The build now supports JUnit 5 tests while preserving existing JUnit 4 test execution through Vintage. No current merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: updating testing dependencies and Surefire configuration to enable JUnit 5 tests while retaining JUnit 4 support.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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