RFR: 8350601: Miscellaneous updates to jpackage test lib [v3]

[Alexey Semenyuk]

On Tue, 25 Feb 2025 01:14:05 GMT, Alexander Matveev <almatvee at openjdk.org> wrote:

>>> This one is confusing. It will evaluate to true if both != null
>> 
>> Correct. They both shouldn't be `true`. One of them must be `true`, and another one must be `false`.
>> 
>>> Did you mean "&&" instead of "=="?
>> 
>> No. I meant `==` :)
>
> If they both set to non-null value, then exception will be thrown since false == false. In this case exception message is confusing. Maybe change it to: `Only one of `expectedPath` and `expectedExceptionClass` should be set`

Fixed as suggested

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PR Review Comment: https://git.openjdk.org/jdk/pull/23754#discussion_r1970049352