@VisibleForTesting
  static VersionManager getInstance(String classpathsFileName) {
    VersionManager result = new VersionManager();
    result.findVersions(classpathsFileName);
    return result;
  }
For unit testing, this creates a VersionManager with paths loaded from the given file, which
may or may not exist. The instance is not retained
geode-junit/src/main/java/org/apache/geode/test/version/VersionManager.java