RFR: 8310234: Refactor Locale tests to use JUnit

[Justin Lu]

On Thu, 22 Jun 2023 01:08:30 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)

test/jdk/java/util/Locale/LocaleConstructors.java line 51:

> 49:     public void langTest() {
> 50:         Locale aLocale = Locale.of(LANG);
> 51:         Locale otherLocale = new Locale(LANG);

Is there a preference on testing code that is marked as `@deprecated` in the JDK? This test originally validated the parameters of the deprecated Locale constructor but was changed in 2022 with the Locale.of() method. However, the test was originally meant to test the constructor so I re-inserted it here.

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PR Review Comment: https://git.openjdk.org/jdk/pull/14609#discussion_r1238889219