RFR: 8361715: (bf) Improve java/nio/Buffer/GetChars.java and migrate to JUnit [v4]

[Brian Burkhalter]

On Wed, 16 Jul 2025 11:46:06 GMT, Brett Okken <duke at openjdk.org> wrote:

> > It looks like some of the range tests and the char get test overlap with ... `GetChars`
> 
> My intent was to be able to replace `GetChars`.

That is the objective originally intended for the fix of this issue.

> I did not carry forward the randomization of content, positions, limits, etc. because I prefer avoiding randomness in tests when it does not seem strictly required/valuable.

Just to note that the test library `RandomFactory` logs the seed used and allows specifying the seed in order to replicate a given random set of parameters.

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PR Comment: https://git.openjdk.org/jdk/pull/26282#issuecomment-3081196858