@Test(expected = IllegalStateException.class)
 public void noPasswordExpirationInMonth() {
   PasswordPolicy.builder()
       .maximumLength(0)
       .minimumDigit(0)
       .minimumLength(0)
       .minimumLowerCaseCharacter(0)
       .minimumSpecialCharacter(0)
       .minimumUpperCaseCharacter(0)
       .build();
 }
 @Test
 public void valid() {
   PasswordPolicy.builder()
       .maximumLength(0)
       .minimumDigit(0)
       .minimumLength(0)
       .minimumLowerCaseCharacter(0)
       .minimumSpecialCharacter(0)
       .minimumUpperCaseCharacter(0)
       .passwordExpirationInMonth(0)
       .build();
 }