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				// Copyright (c) 2020 The Bitcoin Core developers
				// Distributed under the MIT software license, see the accompanying
				// file COPYING or http://www.opensource.org/licenses/mit-license.php.

				#include <primitives/block.h>
				#include <test/fuzz/FuzzedDataProvider.h>
				#include <test/fuzz/fuzz.h>
				#include <test/fuzz/util.h>
				#include <uint256.h>

				#include <cassert>
				#include <cstdint>
				#include <optional>
				#include <string>
				#include <vector>

				void test_one_input(const std::vector<uint8_t> &buffer) {
				FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
				const std::optional<CBlockHeader> block_header =
				ConsumeDeserializable<CBlockHeader>(fuzzed_data_provider);
				if (!block_header) {
				return;
				}
				{
				const BlockHash hash = block_header->GetHash();
				static const BlockHash blockhash_max(
				uint256S("fffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
				"fffffff"));
				assert(hash != blockhash_max);
				assert(block_header->GetBlockTime() == block_header->nTime);
				assert(block_header->IsNull() == (block_header->nBits == 0));
				}
				{
				CBlockHeader mut_block_header = *block_header;
				mut_block_header.SetNull();
				assert(mut_block_header.IsNull());
				CBlock block{*block_header};
				assert(block.GetBlockHeader().GetHash() == block_header->GetHash());
				(void)block.ToString();
				block.SetNull();
				assert(block.GetBlockHeader().GetHash() == mut_block_header.GetHash());
				}
				}