RFR: 8310923: Refactor Currency tests to use JUnit [v4]

[Justin Lu]

On Thu, 29 Jun 2023 23:07:14 GMT, Naoto Sato <naoto at openjdk.org> wrote:

>> Justin Lu has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove unusued JUnit imports from ValidateISO4217.java
>
> test/jdk/java/util/Currency/MinorUndefinedCodes.java line 27:
> 
>> 25:  * @test
>> 26:  * @bug 4512215 4818420 4819436 8310923
>> 27:  * @summary Test some minor undefined currencies.
> 
> It'd be more readable something like "currencies without minor units." The class name can also be renamed to something like NoMinorUnitCurrenciesTest

Adjusted the wording throughout the file according to your suggestions

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PR Review Comment: https://git.openjdk.org/jdk/pull/14682#discussion_r1247547152