[jdk17u-dev] RFR: 8310049: Refactor Charset tests to use JUnit

[Ralf Schmelter]

On Sun, 5 Oct 2025 18:00:35 GMT, Goetz Lindenmaier <goetz at openjdk.org> wrote:

> I backport this for parity with 17.0.18-oracle.
> 
> I had to resolve as [8260265: UTF-8 by Default](https://bugs.openjdk.org/browse/JDK-8260265) is not in 17.
> 
> The most notable difference is that I omitted the method defaultCharsetTest()
> rather at the beginning, which replaces the try/catch added by 8260265 at the end.

Looks good

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Marked as reviewed by rschmelter (Reviewer).

PR Review: https://git.openjdk.org/jdk17u-dev/pull/4015#pullrequestreview-3311097303