RFR: 8361715: (bf) Improve java/nio/Buffer/GetChars.java and migrate to JUnit

[Brett Okken]

On Sun, 13 Jul 2025 23:56:28 GMT, Brett Okken <duke at openjdk.org> wrote:

> junit for CharSequence behavior of CharBuffer covering different CharBuffer implementations in various states (offset, position, limit)

The getChars test does fail when run with builds of jdk 25 prior to the fix for https://bugs.openjdk.org/browse/JDK-8361299.

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PR Comment: https://git.openjdk.org/jdk/pull/26282#issuecomment-3069374475