// calls.
    InternetDomainName child = parent.child(LOTS_OF_DELTAS);
    InternetDomainName unused = child.child(LOTS_OF_DELTAS);
  }

  public void testValidTopPrivateDomain() {
    InternetDomainName googleDomain = InternetDomainName.from("google.com");

    assertEquals(googleDomain, googleDomain.topPrivateDomain());