[jdk26u] RFR: 8373716: Refactor further java/util tests from TestNG to JUnit

[Shivangi Gupta]

Straight Backport.Ran the test all passed

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Commit messages:
 - Backport 4e05748f0899cabb235c71ecdf4256d4ad137a0d

Changes: https://git.openjdk.org/jdk26u/pull/56/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk26u&pr=56&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8373716
  Stats: 185 lines in 14 files changed: 44 ins; 23 del; 118 mod
  Patch: https://git.openjdk.org/jdk26u/pull/56.diff
  Fetch: git fetch https://git.openjdk.org/jdk26u.git pull/56/head:pull/56

PR: https://git.openjdk.org/jdk26u/pull/56