RFR: 8347424: Fix and rewrite sun/security/x509/DNSName/LeadingPeriod.java test

[Aleksey Shipilev]

On Fri, 10 Jan 2025 12:37:42 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Noticed this when backporting [JDK-8311546](https://bugs.openjdk.org/browse/JDK-8311546). The test is actually broken, as it does not include CA cert in the certification path. So it passes even without the fix, and thus the test does not actually test what the fix is supposed to fix.
> 
> The test is also quite hairy and can be drastically simplified.
> 
> It looks to me the actual bug is in this line:
> 
> 
> List<Certificate> list = List.of(targetCert);
> 
> 
> I think it got wrongly rewritten here:
> https://github.com/openjdk/jdk/commit/a2c0fa6f9ccefd3d1b088c51d0b8170cfb59a885#diff-518af459086b0cd1aef2498da82abf7da93391c030662e55312860ac9ce80542L55
> 
> 
> Additional testing:
>  - [x] Test now fails with [JDK-8311546](https://bugs.openjdk.org/browse/JDK-8311546) fix reverted, passes with it

Thank you for reviews!

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PR Comment: https://git.openjdk.org/jdk/pull/23033#issuecomment-2593412085