RFR: 8310234: Refactor Locale tests to use JUnit [v4]

[Naoto Sato]

On Thu, 22 Jun 2023 20:41:33 GMT, Justin Lu <jlu at openjdk.org> wrote:

>> Please review this PR as apart of [JDK-8307843](https://bugs.openjdk.org/browse/JDK-8307843) which refactors some tests in Locale to use JUnit. Other cleanup and small changes are included as well. More refactoring in Locale tests will be done in separate PRs.
>> 
>> If the test had a bugNNNNN.java name, it was also renamed to something more [descriptive](https://openjdk.org/jtreg/faq.html#how-should-i-name-a-test).
>> 
>> Below is a list of all the changes,
>> 
>> - Refactor Bug4316602.java as LocaleConstructors.java
>> - Refactor Bug4210525.java as CaseCheckVariant.java
>> - Refactor bug6277243.java as RootLocale.java
>> - Refactor bug6312358.java as GetInstanceCheck.java
>> - Refactor Bug8154797.java as CompareProviderFormats.java
>> - Refactor Bug8004240.java as GetAdapterPreference.java
>> - Refactor bug4122700.java into AvailableLocalesTest.java (and combined with StreamAvailableLocales.java)
>
> Justin Lu has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Put Bug ID in method description of nonEmptyLocalesTest()

LGTM

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Marked as reviewed by naoto (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/14609#pullrequestreview-1494026613