[jdk21u-dev] RFR: 8310049: Refactor Charset tests to use JUnit

[Goetz Lindenmaier]

On Sun, 5 Oct 2025 17:41:13 GMT, Goetz Lindenmaier <goetz at openjdk.org> wrote:

> I backport this for parity with 21.0.10-oracle

GHA failures:
macos: infra issue
windows: jdk21u-dev/make/scripts/fixpath.sh: line 427:  1401 Segmentation fault      "$command" "${collected_args[@]}"
unrelated.

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PR Comment: https://git.openjdk.org/jdk21u-dev/pull/2296#issuecomment-3379938412