[jdk25] RFR: 8358171: Additional code coverage for PEM API

[Rajan Halade]

On Tue, 10 Jun 2025 07:26:54 GMT, Fernando Guallini <fguallini at openjdk.org> wrote:

> Hi all,
> 
> This pull request contains a backport of commit [b2e7cda6](https://github.com/openjdk/jdk/commit/b2e7cda6a0bd21fa3c4ffe2a67da4953f1ca3f1f) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Fernando Guallini on 6 Jun 2025 and was reviewed by Anthony Scarpino.
> 
> Thanks!

Marked as reviewed by rhalade (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/25712#pullrequestreview-2914668327