@Test public void testGetApplicablePolicies() throws Exception {
  AccessControlPolicyIterator it=acMgr.getApplicablePolicies("/");
  while (it.hasNext()) {
    if (it.nextAccessControlPolicy() == TestPolicy.INSTANCE) {
      fail("TestPolicy should only be applicable at /test.");
    }
  }
  Set applicable=ImmutableSet.copyOf(acMgr.getApplicablePolicies(TEST_PATH));
  assertEquals(2,applicable.size());
  assertTrue(applicable.contains(TestPolicy.INSTANCE));
}