RFR: 8313612: Use JUnit in lib-test/jdk tests [v4]

[Christian Stein]

On Tue, 19 Sep 2023 18:30:10 GMT, Qing Xiao <xqoasis at openjdk.org> wrote:

>> Modified all tests under lib-test/jdk to use JUnit
>
> Qing Xiao has updated the pull request incrementally with three additional commits since the last revision:
> 
>  - Update test/lib-test/jdk/test/lib/hexdump/ObjectStreamPrinterTest.java
>    
>    Co-authored-by: liach <7806504+liach at users.noreply.github.com>
>  - Update test/lib-test/jdk/test/lib/hexdump/HexPrinterTest.java
>    
>    Co-authored-by: liach <7806504+liach at users.noreply.github.com>
>  - Update test/lib-test/jdk/test/lib/format/ArrayDiffTest.java
>    
>    Co-authored-by: Christian Stein <sormuras at gmail.com>

Looks good to me.

Tested with `--test test/lib-test/jdk/test/lib`.

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Marked as reviewed by cstein (Committer).

PR Review: https://git.openjdk.org/jdk/pull/15131#pullrequestreview-1635286817