@Test
void toLowerCase() {

    assertThat(ASCII.toLowerCase(null)).isNull();
    assertThat(ASCII.toLowerCase("text")).isEqualTo("text");
    assertThat(ASCII.toLowerCase("tExt")).isEqualTo("text");
    assertThat(ASCII.toLowerCase("TEXT")).isEqualTo("text");
    assertThat(ASCII.toLowerCase("01239_-")).isEqualTo("01239_-");
}