RFR: 8373661: Add edge case tests for Objects.requireNonNull methods

[eunbin son]

On Tue, 16 Dec 2025 13:22:40 GMT, eunbin son <duke at openjdk.org> wrote:

> ## Summary
> Adds comprehensive edge case tests for `Objects.requireNonNull`, 
> `requireNonNullElse`, and `requireNonNullElseGet` methods to improve 
> test coverage.
> 
> ## Problem
> The current test suite for `Objects.requireNonNull` methods covers 
> basic cases but lacks edge case coverage.
> 
> ## Solution
> This PR adds tests for the following edge cases:
> - requireNonNull with null Supplier parameter
> - requireNonNull with Supplier that throws exception
> - requireNonNullElse with both arguments null
> - requireNonNullElseGet with null supplier
> - requireNonNullElseGet with supplier returning null
> 
> ## Issue
> Fixes JDK-8373661
> 
> **JBS Issue Link**: https://bugs.java.com/bugdatabase/view_bug?bug_id=JDK-8373661
> 
> ## Type of Change
> - [x] Test addition/modification
> - [ ] Bug fix
> - [ ] New feature
> - [ ] Documentation improvement
> - [ ] Refactoring
> 
> ## Testing
> 
> make test TEST="jtreg:test/jdk/java/util/Objects"

Thanks for reviews.
I've completed the JUnit conversion as requested:

- [✔] Converted `BasicObjectsTest.java` to JUnit format
- [✔] Added all edge case tests using JUnit annotations
- [✔] All tests pass successfully

The changes have been pushed. Please review again.

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PR Comment: https://git.openjdk.org/jdk/pull/28845#issuecomment-3662806511