RFR: 8378565: Refactor test/jdk/java/net/httpclient/http3/*.java TestNG tests to JUnit

[Volkan Yazici]

On Tue, 24 Feb 2026 14:21:31 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

> This is a followup from https://github.com/openjdk/jdk/pull/29850, this time converting all (but one) TestNG tests under `test/jdk/java/net/httpclient/http3/` to use JUnit

@dfuch, LGTM. The conversion is performed with minimal changes. This extremely helped with the review. Thanks so much.

I'm assuming that

1. You've checked the touched files in an IDE and verified that there are no unused imports, etc.
2. Tier 1-2 is clear.
3. Copyright years of the touched files are updated accordingly.

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Marked as reviewed by vyazici (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/29893#pullrequestreview-3866887529