RFR: JDK-8290836 Improve test coverage for XPath functions: String Functions [v2]

[Joe Wang]

On Fri, 5 Aug 2022 18:30:05 GMT, Bill Huang <duke at openjdk.org> wrote:

>> Improve test coverage for XPath functions: [JDK-8290836](https://bugs.openjdk.org/browse/JDK-8290836), [JDK-8290837](https://bugs.openjdk.org/browse/JDK-8290837), [JDK-8290838](https://bugs.openjdk.org/browse/JDK-8290838).
>
> Bill Huang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Added comments and fixed typo.

Thanks for the update.

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Marked as reviewed by joehw (Reviewer).

PR: https://git.openjdk.org/jdk/pull/9752