[code-reflection] Integrated: Update test with return value

[Paul Sandoz]

Update test with return value, to show a more complete example.

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Commit messages:
 - Update test with return value

Changes: https://git.openjdk.org/babylon/pull/457/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=457&range=00
  Stats: 10 lines in 1 file changed: 3 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/babylon/pull/457.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/457/head:pull/457

PR: https://git.openjdk.org/babylon/pull/457