.*
        <h2>0 Inscriptions</h2>
        <div class=thumbnails>
        </div>
        <h2>1 Transaction</h2>
        <ul class=monospace>
          <li><a href=/tx/[[:xdigit:]]{64}>[[:xdigit:]]{64}</a></li>
        </ul>
      "
      .unindent()
    );
  }

  #[test]
  fn next_active_when_not_last() {
    assert_regex_match!(
      BlockHtml::new(
        Chain::Mainnet.genesis_block(),
        Height(0),
        Height(1),
        0,
        Vec::new()
      ),
      r"<h1>Block 0</h1>.*prev\s*<a class=next href=/block/1>next</a>.*"
    );
  }

  #[test]
  fn prev_active_when_not_first() {
    assert_regex_match!(
      BlockHtml::new(
        Chain::Mainnet.genesis_block(),
        Height(1),
        Height(1),
        0,
        Vec::new()
      ),
      r"<h1>Block 1</h1>.*<a class=prev href=/block/0>prev</a>\s*next.*",
    );
  }

  #[test]
  fn block_hash_serializes_as_hex_string() {
    assert_eq!(
      serde_json::to_string(&BlockHash::all_zeros()).unwrap(),
      "\"0000000000000000000000000000000000000000000000000000000000000000\""