Inside Bitcoin

1// Copyright (c) 2025-present The Bitcoin Core developers
2// Distributed under the MIT software license, see the accompanying
3// file COPYING or http://www.opensource.org/licenses/mit-license.php.
4
5#include <chain.h>
6#include <interfaces/mining.h>
7#include <node/mining_types.h>
8#include <primitives/block.h>
9#include <sync.h>
10#include <test/util/common.h>
11#include <test/util/setup_common.h>
12#include <test/util/time.h>
13#include <util/time.h>
14#include <validation.h>
15
16#include <boost/test/unit_test.hpp>
17
18#include <memory>
19
20using interfaces::BlockTemplate;
21using interfaces::Mining;
22using node::BlockWaitOptions;
23
24namespace testnet4_miner_tests {
25
26struct Testnet4MinerTestingSetup : public Testnet4Setup {
27    std::unique_ptr<Mining> MakeMining()
28    {
29        return interfaces::MakeMining(m_node, /*wait_loaded=*/false);
30    }
31};
32} // namespace testnet4_miner_tests
33
34BOOST_FIXTURE_TEST_SUITE(testnet4_miner_tests, Testnet4MinerTestingSetup)
35
36BOOST_AUTO_TEST_CASE(MiningInterface)
37{
38    auto mining{MakeMining()};
39    BOOST_REQUIRE(mining);
40
41    std::unique_ptr<BlockTemplate> block_template;
42
43    // Set node time a few minutes past the testnet4 genesis block
44    const auto template_time{3min + WITH_LOCK(cs_main, return m_node.chainman->ActiveChain().Tip()->Time())};
45    FakeNodeClock clock{template_time};
46
47    block_template = mining->createNewBlock({}, /*cooldown=*/false);
48    BOOST_REQUIRE(block_template);
49
50    // The template should use the mocked system time
51    BOOST_REQUIRE_EQUAL(block_template->getBlockHeader().Time(), template_time);
52
53    const BlockWaitOptions wait_options{.timeout = MillisecondsDouble{0}, .fee_threshold = 1};
54
55    // waitNext() should return nullptr because there is no better template
56    auto should_be_nullptr = block_template->waitNext(wait_options);
57    BOOST_REQUIRE(should_be_nullptr == nullptr);
58
59    // This remains the case when exactly 20 minutes have gone by
60    clock += 17min;
61    should_be_nullptr = block_template->waitNext(wait_options);
62    BOOST_REQUIRE(should_be_nullptr == nullptr);
63
64    // One second later the difficulty drops and it returns a new template
65    // Note that we can't test the actual difficulty change, because the
66    // difficulty is already at 1.
67    clock += 1s;
68    block_template = block_template->waitNext(wait_options);
69    BOOST_REQUIRE(block_template);
70}
71
72BOOST_AUTO_TEST_SUITE_END()
73