[jdk21u-dev] RFR: 8340393: Open source closed choice tests #2

[Goetz Lindenmaier]

I backport this for parity with 21.0.8-oracle.

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Commit messages:
 - Backport a9b0f9ccbf98c6b90626fcd7087fa8eeb0c168eb

Changes: https://git.openjdk.org/jdk21u-dev/pull/1481/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1481&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340393
  Stats: 322 lines in 4 files changed: 322 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1481.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1481/head:pull/1481

PR: https://git.openjdk.org/jdk21u-dev/pull/1481