private static byte[] createNonEmptyVanityData() {
    final byte[] vanity_bytes = new byte[32];
    for (int i = 0; i < vanity_bytes.length; i++) {
      vanity_bytes[i] = (byte) (i + 1);
    }
    return vanity_bytes;
  }
This test specifically verifies that {@link IbftExtraDataCodec#decode(BlockHeader)} uses {@link
RLPInput#readInt()} rather than {@link RLPInput#readIntScalar()} to decode the round number
consensus/ibft/src/test/java/org/hyperledger/besu/consensus/ibft/IbftExtraDataRLPEncoderTest.java