Modified all tests under lib-test/jdk to use JUnit -------------
Commit messages: - Corrected the testSecondArrayIsNull() in ArrayDiffTest and modified format. - Modified all tests under lib-test/jdk to use JUnit Changes: https://git.openjdk.org/jdk/pull/15131/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15131&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8313612 Stats: 288 lines in 5 files changed: 45 ins; 26 del; 217 mod Patch: https://git.openjdk.org/jdk/pull/15131.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/15131/head:pull/15131 PR: https://git.openjdk.org/jdk/pull/15131
