RFR: 7903874: Create a test for CODETOOLS-7903842

[Alexandre Iline]

To help with testing.

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Commit messages:
 - Uncomment cleanup
 - CODETOOLS-7903874: Create a test for CODETOOLS-7903842

Changes: https://git.openjdk.org/jcov/pull/52/files
  Webrev: https://webrevs.openjdk.org/?repo=jcov&pr=52&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903874
  Stats: 217 lines in 4 files changed: 180 ins; 34 del; 3 mod
  Patch: https://git.openjdk.org/jcov/pull/52.diff
  Fetch: git fetch https://git.openjdk.org/jcov.git pull/52/head:pull/52

PR: https://git.openjdk.org/jcov/pull/52