@Test
public void testRemoveFirstNoMatch() throws InvalidNameException {

    LdapName ldapName = new LdapName(EXPECTED_DN_STRING);
    LdapName result = LdapUtils.removeFirst(ldapName, new LdapName("OU=oooooo,OU=M"));
    assertThat(result).isNotSameAs(ldapName);
    assertThat(result).isEqualTo(ldapName);
}