new Predicate<String>() {
        @Override
        public boolean apply(String key) {
          return !"badkey".equals(key);
        }
      };

  public void testFilterKeys() {
    Multimap<String, Integer> unfiltered = HashMultimap.create();
    unfiltered.put("foo", 55556);
    unfiltered.put("badkey", 1);
    Multimap<String, Integer> filtered = filterKeys(unfiltered, KEY_PREDICATE);

      new Predicate<String>() {
        @Override
        public boolean apply(String key) {
          return !"badkey".equals(key);
        }
      };

  public void testFilterKeys() {
    Multimap<String, Integer> unfiltered = HashMultimap.create();
    unfiltered.put("foo", 55556);
    unfiltered.put("badkey", 1);
    Multimap<String, Integer> filtered = filterKeys(unfiltered, KEY_PREDICATE);