Conversion of TestNG tests in _test/jdk/java/nio/charset_ (5) and _test/jdk/sun/nio/cs_ (2) to use JUnit.
------------- Commit messages: - TestNG -> JUnit Changes: https://git.openjdk.org/jdk/pull/30273/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=30273&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8380218 Stats: 152 lines in 7 files changed: 31 ins; 28 del; 93 mod Patch: https://git.openjdk.org/jdk/pull/30273.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/30273/head:pull/30273 PR: https://git.openjdk.org/jdk/pull/30273
