RFR: 8373808: Refactor java/net/httpclient qpack and hpack tests to use JUnit

[Daniel Jeliński]

On Thu, 18 Dec 2025 14:07:34 GMT, Aleksei Efimov <aefimov at openjdk.org> wrote:

> The change below refactors QPack and HPack HttpClient tests to use the JUnit test framework instead of the TestNG one.
> No failures of the modified tests seen with:
> `make test TEST=open/test/jdk/java/net/httpclient/http2/Hpack*\ open/test/jdk/java/net/httpclient/qpack`
> 
> Test-framework stats after the modification:
> QPack tests:
>  `Framework-based tests: 2,385 = 0 TestNG + 2,385 JUnit`
> HPack tests:
>   `Framework-based tests: 108 = 0 TestNG + 108 JUnit`

Marked as reviewed by djelinski (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/28900#pullrequestreview-3607120946