[code-reflection] RFR: Transform runtime test to JUnit

[Mourad Abbay]

Transform runtime test to JUnit.

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Commit messages:
 - Transform runtime test to JUnit

Changes: https://git.openjdk.org/babylon/pull/578/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=578&range=00
  Stats: 1609 lines in 85 files changed: 390 ins; 451 del; 768 mod
  Patch: https://git.openjdk.org/babylon/pull/578.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/578/head:pull/578

PR: https://git.openjdk.org/babylon/pull/578