message: Test Transaction::txid()
diff: @@ -150,6 +150,10 @@ fn tx_read_write() {
  0x9b, 0x27, 0xdb, 0x5f, 0x95, 0xfd, 0x09, 0xa3, 0x6b, 0x05,
  ];
  let tx = Transaction::read(&data[..]).unwrap();
  + assert_eq!(
  + format!("{}", tx.txid()),
  + "64f0bd7fe30ce23753358fe3a2dc835b8fba9c0274c4e2c54a6f73114cb55639"
  + );
  let mut encoded = Vec::with_capacity(data.len());
  tx.write(&mut encoded).unwrap();
  