RFR: 8302983: ZoneRulesProvider.registerProvider() twice will remove provider [v2]

[Madjosz]

On Fri, 24 Feb 2023 19:35:29 GMT, Madjosz <duke at openjdk.org> wrote:

>> test/jdk/java/time/test/java/time/zone/TestZoneRulesProvider.java line 123:
>> 
>>> 121:         ZoneRulesProvider.registerProvider(provider);
>>> 122:         assertTrue(ZoneId.getAvailableZoneIds().contains(zone), "Unexpected non-availability for " + zone);
>>> 123:         assertNotNull(ZoneId.of(zone), "ZoneId instance for " + zone + " should be obtainable");
>> 
>> If the `zone` does not exist, it will not return `null` but throw an exception. Assertion needs to be modified correctly.
>
> Which version of TestNG is used for JDK? In JUnit 5 I would just use `assertDoesNotThrow()` in such a case but TestNG seems to lack such method.

I just removed the non-`null` assertion as the fact that the call succeeds already is the thing we want to test here.

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PR: https://git.openjdk.org/jdk/pull/12690