RFR: Service loading module test

[Alexandre Iline]

A test framework for module testing will need to be developed later. Just a single test for now.

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Commit messages:
 - Service loading module test

Changes: https://git.openjdk.org/jcov/pull/37/files
 Webrev: https://webrevs.openjdk.org/?repo=jcov&pr=37&range=00
  Stats: 228 lines in 6 files changed: 214 ins; 0 del; 14 mod
  Patch: https://git.openjdk.org/jcov/pull/37.diff
  Fetch: git fetch https://git.openjdk.org/jcov pull/37/head:pull/37

PR: https://git.openjdk.org/jcov/pull/37