8310049: Refactor Charset tests to use JUnit

[GoeLin]

I backport this for parity with 21.0.10-oracle

---

Progress

• Change must not contain extraneous whitespace
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• JDK-8310049 needs maintainer approval

Issue

• JDK-8310049: Refactor Charset tests to use JUnit (Sub-task - P4 - Approved)

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[bridgekeeper]

👋 Welcome back goetz! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

@GoeLin This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8310049: Refactor Charset tests to use JUnit

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 8 new commits pushed to the master branch:

• 4d0efce: 8353592: Open source several scrollbar tests
• ccfe9c5: 8353483: Open source some JProgressBar tests
• f2474df: 8366092: [GCC static analyzer] UnixOperatingSystem.c warning: use of uninitialized value 'systemTicks'
• ... and 5 more: https://git.openjdk.org/jdk21u-dev/compare/888901f9307259534bdbe4dbd8a3c184ca56b5c4...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

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[openjdk]

This backport pull request has now been updated with issue from the original commit.

[openjdk]

⚠️ @GoeLin This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[mlbridge]

Webrevs

• 00: Full (9ff890ce)

[justin-curtis-lu]

In illegalCharsetsTest and emptyCharsetsTest, please consider changing the second instance of Charset.forName to Charset.isSupported which was a faulty conversion made in the original change. Otherwise if not in this PR, please consider back-porting JDK-8369078 as well, thank you.

[GoeLin]

Thanks for pointing me to this. I will backport 8369078, too.

[GoeLin]

GHA failures:
macos: infra issue
windows: jdk21u-dev/make/scripts/fixpath.sh: line 427: 1401 Segmentation fault "$command" "${collected_args[@]}"
unrelated.

[GoeLin]

/integrate

[openjdk]

Going to push as commit 9a19496.
Since your change was applied there have been 8 commits pushed to the master branch:

• 4d0efce: 8353592: Open source several scrollbar tests
• ccfe9c5: 8353483: Open source some JProgressBar tests
• f2474df: 8366092: [GCC static analyzer] UnixOperatingSystem.c warning: use of uninitialized value 'systemTicks'
• ... and 5 more: https://git.openjdk.org/jdk21u-dev/compare/888901f9307259534bdbe4dbd8a3c184ca56b5c4...master

Your commit was automatically rebased without conflicts.

[openjdk]

@GoeLin Pushed as commit 9a19496.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.