RFR: 8373661: Add edge case tests for Objects.requireNonNull methods [v4]

[Chen Liang]

On Wed, 17 Dec 2025 21:03:48 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> eunbin son has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   8373661: Use assertSame for exception instance verification
>>   
>>   Updated testRequireNonNullWithSupplierThrowingException to allocate
>>   the exception outside of the lambda and use assertSame to verify
>>   the same exception instance is thrown, as suggested by @liach.
>>   
>>   This provides a more precise verification that the exception from
>>   the supplier is thrown directly, not wrapped.
>>   
>>   Thanks to @liach for the feedback.
>
> test/jdk/java/util/Objects/BasicObjectsTest.java line 218:
> 
>> 216:             "isNull(null) should return true");
>> 217:         assertFalse(Objects.isNull(Objects.class),
>> 218:             "isNull(Objects.class) should return false");
> 
> Could be simplifed with Assertions.assertNull or assertNonNull.  Here and elsewhere in this test.

I think this is testing `isNull` API and shouldn't be simplified.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28845#discussion_r2628817056