private void checkForLoadFailure() {
    if (!loadFailure.isEmpty()) {
      throw new InternalError(loadFailure);
    }
  }
Returns a list of testable versions 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 testable versions sorted from oldest to newest
geode-junit/src/main/java/org/apache/geode/test/version/VersionManager.java