[jdk23u] RFR: 8339154: Cleanups and JUnit conversion of test/jdk/java/util/zip/Available.java

[Shivangi Gupta]

Straight Backport. Cleanups and JUnit conversion. Good To backport to lower releases.

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Commit messages:
 - Backport f927c1210ee0675bb1196572177ffb505826d57a

Changes: https://git.openjdk.org/jdk23u/pull/199/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk23u&pr=199&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8339154
  Stats: 119 lines in 1 file changed: 76 ins; 9 del; 34 mod
  Patch: https://git.openjdk.org/jdk23u/pull/199.diff
  Fetch: git fetch https://git.openjdk.org/jdk23u.git pull/199/head:pull/199

PR: https://git.openjdk.org/jdk23u/pull/199