assertEquals(1, filtered.size());
    assertTrue(filtered.containsEntry("foo", 55556));
  }

  private static final Predicate<Integer> VALUE_PREDICATE = value -> !Objects.equals(value, 55556);

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