)
    assertInvalid(
      "http://[0:0:0:0:0:1:256.255.255.255]/",
      "Invalid URL host: \"[0:0:0:0:0:1:256.255.255.255]\"",
    )
    assertInvalid(
      "http://[0:0:0:0:0:1:ff.255.255.255]/",
      "Invalid URL host: \"[0:0:0:0:0:1:ff.255.255.255]\"",
    )
    assertInvalid(
      "http://[0:0:0:0:0:0:1:255.255.255.255]/",
      "Invalid URL host: \"[0:0:0:0:0:0:1:255.255.255.255]\"",
    )
    assertInvalid(

            @Override
            public CacheStats snapshot() {
              return EMPTY_STATS;
            }
          });
  static final CacheStats EMPTY_STATS = new CacheStats(0, 0, 0, 0, 0, 0);

  /*
   * We avoid using a method reference or lambda here for now:
   *
   * - method reference: Inside Google, CacheBuilder is used from the implementation of a custom