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