@Override
  public String formatInteger(Locale locale, Integer value) {
    return NumberFormat.getNumberInstance(locale).format(value);
  }
@Test
  public void format_integer() {
    assertThat(underTest.formatInteger(Locale.ENGLISH, 10)).isEqualTo("10");
    assertThat(underTest.formatInteger(Locale.ENGLISH, 100000)).isEqualTo("100,000");
  }