LCOV - code coverage report
Current view: top level - src/test - chain_tests.cpp (source / functions) Coverage Total Hit
Test: total_coverage.info Lines: 100.0 % 45 45
Test Date: 2025-10-25 05:06:34 Functions: 100.0 % 4 4
Branches: 56.6 % 136 77

             Branch data     Line data    Source code
       1                 :             : // Copyright (c) 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 <boost/test/unit_test.hpp>
       6                 :             : 
       7                 :             : #include <chain.h>
       8                 :             : #include <test/util/setup_common.h>
       9                 :             : 
      10                 :             : #include <memory>
      11                 :             : 
      12                 :             : BOOST_FIXTURE_TEST_SUITE(chain_tests, BasicTestingSetup)
      13                 :             : 
      14                 :             : namespace {
      15                 :             : 
      16                 :      100000 : const CBlockIndex* NaiveGetAncestor(const CBlockIndex* a, int height)
      17                 :             : {
      18         [ +  + ]:     5666974 :     while (a->nHeight > height) {
      19                 :     5566974 :         a = a->pprev;
      20                 :             :     }
      21         [ +  - ]:      100000 :     BOOST_REQUIRE_EQUAL(a->nHeight, height);
      22                 :      100000 :     return a;
      23                 :             : }
      24                 :             : 
      25                 :      100000 : const CBlockIndex* NaiveLastCommonAncestor(const CBlockIndex* a, const CBlockIndex* b)
      26                 :             : {
      27         [ +  + ]:     2932074 :     while (a->nHeight > b->nHeight) {
      28                 :     2832074 :         a = a->pprev;
      29                 :             :     }
      30         [ +  + ]:     2898460 :     while (b->nHeight > a->nHeight) {
      31                 :     2798460 :         b = b->pprev;
      32                 :             :     }
      33         [ +  + ]:     5314265 :     while (a != b) {
      34         [ +  - ]:     5214265 :         BOOST_REQUIRE_EQUAL(a->nHeight, b->nHeight);
      35                 :     5214265 :         a = a->pprev;
      36                 :     5214265 :         b = b->pprev;
      37                 :             :     }
      38         [ +  - ]:      100000 :     BOOST_REQUIRE_EQUAL(a, b);
      39                 :      100000 :     return a;
      40                 :             : }
      41                 :             : 
      42                 :             : } // namespace
      43                 :             : 
      44   [ +  -  +  -  :           7 : BOOST_AUTO_TEST_CASE(chain_test)
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                      - ]
      45                 :             : {
      46                 :           1 :     FastRandomContext ctx;
      47                 :           1 :     std::vector<std::unique_ptr<CBlockIndex>> block_index;
      48                 :             :     // Run 10 iterations of the whole test.
      49         [ +  + ]:          11 :     for (int i = 0; i < 10; ++i) {
      50                 :          10 :         block_index.clear();
      51                 :             :         // Create genesis block.
      52         [ +  - ]:          10 :         auto genesis = std::make_unique<CBlockIndex>();
      53         [ +  - ]:          10 :         genesis->nHeight = 0;
      54         [ +  - ]:          10 :         block_index.push_back(std::move(genesis));
      55                 :             :         // Create 10000 more blocks.
      56         [ +  + ]:      100010 :         for (int b = 0; b < 10000; ++b) {
      57         [ +  - ]:      100000 :             auto new_index = std::make_unique<CBlockIndex>();
      58                 :             :             // 95% of blocks build on top of the last block; the others fork off randomly.
      59         [ +  + ]:      100000 :             if (ctx.randrange(20) != 0) {
      60                 :       94934 :                 new_index->pprev = block_index.back().get();
      61                 :             :             } else {
      62         [ -  + ]:        5066 :                 new_index->pprev = block_index[ctx.randrange(block_index.size())].get();
      63                 :             :             }
      64         [ +  - ]:      100000 :             new_index->nHeight = new_index->pprev->nHeight + 1;
      65         [ +  - ]:      100000 :             new_index->BuildSkip();
      66         [ +  - ]:      100000 :             block_index.push_back(std::move(new_index));
      67                 :      100000 :         }
      68                 :             :         // Run 10000 random GetAncestor queries.
      69         [ +  + ]:      100010 :         for (int q = 0; q < 10000; ++q) {
      70         [ -  + ]:      100000 :             const CBlockIndex* block = block_index[ctx.randrange(block_index.size())].get();
      71                 :      100000 :             unsigned height = ctx.randrange<unsigned>(block->nHeight + 1);
      72         [ +  - ]:      100000 :             const CBlockIndex* result = block->GetAncestor(height);
      73   [ +  -  +  -  :      200000 :             BOOST_CHECK(result == NaiveGetAncestor(block, height));
                   +  - ]
      74                 :             :         }
      75                 :             :         // Run 10000 random LastCommonAncestor queries.
      76         [ +  + ]:      100010 :         for (int q = 0; q < 10000; ++q) {
      77   [ -  +  -  + ]:      100000 :             const CBlockIndex* block1 = block_index[ctx.randrange(block_index.size())].get();
      78   [ -  +  +  - ]:      100000 :             const CBlockIndex* block2 = block_index[ctx.randrange(block_index.size())].get();
      79         [ +  - ]:      100000 :             const CBlockIndex* result = LastCommonAncestor(block1, block2);
      80   [ +  -  +  -  :      200000 :             BOOST_CHECK(result == NaiveLastCommonAncestor(block1, block2));
                   +  - ]
      81                 :             :         }
      82                 :          10 :     }
      83                 :           1 : }
      84                 :             : 
      85                 :             : BOOST_AUTO_TEST_SUITE_END()
        

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