Few closed JButton swing manual test converted to automated and open sourced.
------------- Commit messages: - Opensource JButton manual tests Changes: https://git.openjdk.org/jdk/pull/15835/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15835&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8316285 Stats: 297 lines in 3 files changed: 297 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jdk/pull/15835.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/15835/head:pull/15835 PR: https://git.openjdk.org/jdk/pull/15835
