assertTrue(domain.hasPublicSuffix());
    assertEquals("essex.sch.uk", domain.publicSuffix().toString());
    assertEquals("www.essex.sch.uk", domain.topPrivateDomain().toString());
  }

  public void testRegistrySuffixExclusion() {
    InternetDomainName domain = InternetDomainName.from("foo.city.yokohama.jp");
    assertTrue(domain.hasRegistrySuffix());
    assertEquals("yokohama.jp", domain.registrySuffix().toString());