public void testBuilderWithExpectedValuesPerKeyNegative() {
    assertThrows(
        IllegalArgumentException.class, () -> ImmutableMultimap.builder().expectedValuesPerKey(-1));
  }

  public void testBuilderWithExpectedValuesPerKeyZero() {
    ImmutableMultimap.Builder<String, String> builder =
        ImmutableMultimap.<String, String>builder().expectedValuesPerKey(0);
    builder.put("key", "value");