RFR: 8310234: Refactor Locale tests to use JUnit [v3]

[Naoto Sato]

On Thu, 22 Jun 2023 19:23:27 GMT, Justin Lu <jlu at openjdk.org> wrote:

>> test/jdk/java/util/Locale/AvailableLocalesTest.java line 46:
>> 
>>> 44:     /**
>>> 45:      * Test that Locale.getAvailableLocales() is non-empty.
>>> 46:      * Print out the locales.
>> 
>> If you combine two tests into a single one, I'd put the corresponding bug id into the method description.
>
> Unless I am mistaken, both bug IDs, 4122700 8282319 are in the combined file.

Yes. I wanted to make it clear that this `nonEmptyLocalesTest` was for the issue 4122700.

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PR Review Comment: https://git.openjdk.org/jdk/pull/14609#discussion_r1238975301