public void isNotIn(@Nullable Iterable<?> iterable) {
    checkNotNull(iterable);
    if (Iterables.contains(iterable, actual)) {
      failWithActual("expected not to be any of", iterable);
    }
  }
@Test
  public void isNotInNullFailure() {
    expectFailure
        .whenTesting()
        .that((String) null)
        .isNotIn(oneShotIterable("a", "b", (String) null));
  }