assertThrows(IllegalArgumentException.class, () -> bazSet.add(5));
    assertThrows(IllegalArgumentException.class, () -> bazSet.addAll(ImmutableSet.of(6, 7)));
  }

  public void testFilteredKeysListMultimapGetBadValue() {
    ListMultimap<String, Integer> multimap = ArrayListMultimap.create();
    multimap.put("foo", 1);
    multimap.put("bar", 2);
    multimap.put("baz", 3);
    multimap.put("bar", 4);