public void isIn(@Nullable Iterable<?> iterable) {
    checkNotNull(iterable);
    if (!contains(iterable, actual)) {
      failWithActual("expected any of", iterable);
    }
  }
@Test
  public void isInEmptyFailure() {
    expectFailure.whenTesting().that("b").isIn(ImmutableList.<String>of());
  }