EmailAddress { public static boolean isValid(final String address) { return false; }  static boolean isValid(final String address);  }
@Test public void shouldValidateValidEmailAddress() { String a = "firstname.lastname@diabol.se"; assertTrue(EmailAddress.isValid(a)); }
@Test public void shouldNotValidateInvalidEmailAddress() { assertFalse(EmailAddress.isValid("invalid_address")); }