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

[Goetz Lindenmaier]

On Tue, 7 Oct 2025 17:29:40 GMT, Justin Lu <jlu at openjdk.org> wrote:

>> I backport this for parity with 21.0.10-oracle
>
> test/jdk/java/nio/charset/Charset/IllegalCharsetName.java line 52:
> 
>> 50:         assertThrows(IllegalCharsetNameException.class,
>> 51:                 () -> Charset.forName(name));
>> 52:         assertThrows(IllegalCharsetNameException.class,
> 
> In _illegalCharsetsTest_ and _emptyCharsetsTest_, please consider changing the second instance of `Charset.forName` to `Charset.isSupported` which was a faulty conversion made in the original change. Otherwise if not in this PR, please consider back-porting [JDK-8369078](https://bugs.openjdk.org/browse/JDK-8369078) as well, thank you.

Thanks for pointing me to this. I will backport 8369078, too.

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PR Review Comment: https://git.openjdk.org/jdk21u-dev/pull/2296#discussion_r2412731399