@Test
public void testAssureRoot() {

  // permutations of rooted queue names
  final String queueName = "base";
  final String rootOnly = "root";
  final String rootNoDot = "rootbase";
  final String alreadyRoot = "root.base";
  String rooted = assureRoot(queueName);
  assertTrue("Queue should have root prefix (base)",
      rooted.startsWith(ROOT_QUEUE + DOT));
  rooted = assureRoot(rootOnly);
  assertEquals("'root' queue should not have root prefix (root)",
      rootOnly, rooted);
  rooted = assureRoot(rootNoDot);
  assertTrue("Queue should have root prefix (rootbase)",
      rooted.startsWith(ROOT_QUEUE + DOT));
  assertEquals("'root' queue base was replaced and not prefixed", 5,
      rooted.lastIndexOf(ROOT_QUEUE));
  rooted = assureRoot(alreadyRoot);
  assertEquals("Root prefixed queue changed and it should not (root.base)",
      rooted, alreadyRoot);
  assertNull("Null queue did not return null queue",
      assureRoot(null));
  assertEquals("Empty queue did not return empty name", "",
      assureRoot(""));
}