private static Collection<Description> descendantsOf(Description root) {
    List<Description> descendants = new ArrayList<>();
    root.getChildren().forEach(addSelfAndDescendantsTo(descendants));
    return descendants;
  }
Returns a collection of root's descendants. The collection does not contain root.
geode-junit/src/test/java/org/apache/geode/test/junit/runners/GeodeParamsRunnerTest.java