RFR: 8315883: Open source several Swing JToolbar tests [v4]

[Alexey Ivanov]

On Tue, 19 Sep 2023 17:04:59 GMT, Damon Nguyen <dnguyen at openjdk.org> wrote:

>> These are the tests being converted:
>> 
>> javax/swing/JToolBar/4138694/bug4138694.java
>> javax/swing/JToolBar/4140421/bug4140421.java
>> javax/swing/JToolBar/4196662/bug4196662.java
>> javax/swing/JToolBar/4243930/bug4243930.java
>
> Damon Nguyen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove redundant test comment and update exception

Marked as reviewed by aivanov (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/15748#pullrequestreview-1633922980