Updated legacy TestNG asserts to JUnit and added useful context to help debugging when assertions fail.
------------- Commit messages: - Update test to JUnit Changes: https://git.openjdk.org/jdk/pull/29588/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29588&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8377244 Stats: 105 lines in 1 file changed: 6 ins; 55 del; 44 mod Patch: https://git.openjdk.org/jdk/pull/29588.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/29588/head:pull/29588 PR: https://git.openjdk.org/jdk/pull/29588
