RFR: 8373661: Add edge case tests for Objects.requireNonNull methods [v5]

[Roger Riggs]

On Thu, 18 Dec 2025 11:54:41 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"
>
> eunbin son has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8373661: Address code style feedback
>   
>   - Expanded wildcard imports to individual imports
>   - Simplified test messages to identify tests only
>   - Used Assertions.fail() where appropriate
>   - Kept assertTrue/assertFalse for isNull API tests
>   
>   Thanks to @RogerRiggs and @liach for the feedback.

The copyright date needs to be updated to 2025.

Tests should be as readable and maintainable as the other source code.
The coding styles vary a bit, having accumulated by many authors over the years.
Changes should follow the existing coding style in the file, package, module, etc.

The changes look good; thanks for taking on the JUnit conversion and the addition of tests.

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Marked as reviewed by rriggs (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/28845#pullrequestreview-3599377100