public List<String> getVersions() {
    checkForLoadFailure();
    return unmodifiableList(testVersions);
  }
Returns a list of older versions available for testing, sorted from oldest to newest.

<p>
Note: if you need to compare version strings use {@link TestVersion#compare(String, String)} or
{@link TestVersion#equals}.

@return a list of older versions available for testing, sorted from oldest to newest
geode-junit/src/main/java/org/apache/geode/test/version/VersionManager.java