RFR: 8340458: Open source additional Component tests (part 2) [v2]

[Alexander Zuev]

> Clean up and open source four more tests.

Alexander Zuev has updated the pull request incrementally with one additional commit since the last revision:

  Moved variables initialization into the method that is called on EDT;
  Moved dispose call onto EDT so it is called even if test is failed;
  Added missing window dispose call;

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Changes:
  - all: https://git.openjdk.org/jdk/pull/21235/files
  - new: https://git.openjdk.org/jdk/pull/21235/files/e236df12..86b36700

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21235&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21235&range=00-01

  Stats: 26 lines in 2 files changed: 15 ins; 0 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/21235.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21235/head:pull/21235

PR: https://git.openjdk.org/jdk/pull/21235