@Test
void toLowerCaseChar() {

    assertThat(ASCII.toLowerCase('-')).isEqualTo('-');
    assertThat(ASCII.toLowerCase('a')).isEqualTo('a');
    assertThat(ASCII.toLowerCase('z')).isEqualTo('z');
    assertThat(ASCII.toLowerCase('0')).isEqualTo('0');
    assertThat(ASCII.toLowerCase('9')).isEqualTo('9');
    assertThat(ASCII.toLowerCase('A')).isEqualTo('a');
    assertThat(ASCII.toLowerCase('Z')).isEqualTo('z');
}