@Override
  public void setBlockChoiceRule(final Comparator<BlockHeader> blockChoiceRule) {
    throw new UnsupportedOperationException("Not Used for Reference Tests");
  }
An exception thrown for methods not supported by the T8nBlockchain.
ethereum/evmtool/src/main/java/org/hyperledger/besu/evmtool/t8n/T8nBlockchain.java