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

[eunbin son]

On Fri, 19 Dec 2025 19:50:22 GMT, Ron Pressler <rpressler at openjdk.org> wrote:

>> 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.
>
> If an LLM was used in this PR, please provide the model's name and version.

Thanks to @pron for your interest. To answer your question about LLM usage: 
This PR was created with assistance from an AI coding assistant 
(Auto agent router by Cursor: Composer1, Opus4.5, Sonnet 4.5, GPT 5.1, Gemini 3, Grok Code )

for initial code generation, but all changes have been reviewed and refined based on maintainer feedback.

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PR Comment: https://git.openjdk.org/jdk/pull/28845#issuecomment-3677448047