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diff --git a/src/test/pow_tests.cpp b/src/test/pow_tests.cpp
--- a/src/test/pow_tests.cpp
+++ b/src/test/pow_tests.cpp
@@ -113,37 +113,78 @@
SelectParams(CBaseChainParams::MAIN);
const Consensus::Params &params = Params().GetConsensus();
- std::vector<CBlockIndex> blocks(1013);
+ std::vector<CBlockIndex> blocks(115);
+
+ const arith_uint256 powLimit = UintToArith256(params.powLimit);
+ arith_uint256 currentPow = powLimit >> 1;
+ uint32_t initialBits = currentPow.GetCompact();
// Genesis block?
blocks[0] = CBlockIndex();
blocks[0].nHeight = 0;
blocks[0].nTime = 1269211443;
- blocks[0].nBits = 0x207fffff;
+ blocks[0].nBits = initialBits;
// Pile up some blocks.
- for (size_t i = 1; i < 1000; i++) {
- blocks[i] =
- GetBlockIndex(&blocks[i - 1], params.nPowTargetSpacing, 0x207fffff);
+ for (size_t i = 1; i < 100; i++) {
+ blocks[i] = GetBlockIndex(&blocks[i - 1], params.nPowTargetSpacing,
+ initialBits);
}
CBlockHeader blkHeaderDummy;
// We start getting 2h blocks time. For the first 5 blocks, it doesn't
// matter as the MTP is not affected. For the next 5 block, MTP difference
- // increases but stays bellow 12h.
- for (size_t i = 1000; i < 1010; i++) {
- blocks[i] = GetBlockIndex(&blocks[i - 1], 2 * 3600, 0x207fffff);
+ // increases but stays below 12h.
+ for (size_t i = 100; i < 110; i++) {
+ blocks[i] = GetBlockIndex(&blocks[i - 1], 2 * 3600, initialBits);
BOOST_CHECK_EQUAL(
GetNextWorkRequired(&blocks[i], &blkHeaderDummy, params),
- 0x207fffff);
+ initialBits);
}
// Now we expect the difficulty to decrease.
- blocks[1010] = GetBlockIndex(&blocks[1009], 2 * 3600, 0x207fffff);
+ blocks[110] = GetBlockIndex(&blocks[109], 2 * 3600, initialBits);
+ currentPow.SetCompact(currentPow.GetCompact());
+ currentPow += (currentPow >> 2);
BOOST_CHECK_EQUAL(
- GetNextWorkRequired(&blocks[1010], &blkHeaderDummy, params),
- 0x1d00ffff);
+ GetNextWorkRequired(&blocks[110], &blkHeaderDummy, params),
+ currentPow.GetCompact());
+
+ // As we continue with 2h blocks, difficulty continue to decrease.
+ blocks[111] =
+ GetBlockIndex(&blocks[110], 2 * 3600, currentPow.GetCompact());
+ currentPow.SetCompact(currentPow.GetCompact());
+ currentPow += (currentPow >> 2);
+ BOOST_CHECK_EQUAL(
+ GetNextWorkRequired(&blocks[111], &blkHeaderDummy, params),
+ currentPow.GetCompact());
+
+ // We decrease again.
+ blocks[112] =
+ GetBlockIndex(&blocks[111], 2 * 3600, currentPow.GetCompact());
+ currentPow.SetCompact(currentPow.GetCompact());
+ currentPow += (currentPow >> 2);
+ BOOST_CHECK_EQUAL(
+ GetNextWorkRequired(&blocks[112], &blkHeaderDummy, params),
+ currentPow.GetCompact());
+
+ // We check that we do not go below the minimal difficulty.
+ blocks[113] =
+ GetBlockIndex(&blocks[112], 2 * 3600, currentPow.GetCompact());
+ currentPow.SetCompact(currentPow.GetCompact());
+ currentPow += (currentPow >> 2);
+ BOOST_CHECK(powLimit.GetCompact() != currentPow.GetCompact());
+ BOOST_CHECK_EQUAL(
+ GetNextWorkRequired(&blocks[113], &blkHeaderDummy, params),
+ powLimit.GetCompact());
+
+ // Once we reached the minimal difficulty, we stick with it.
+ blocks[114] = GetBlockIndex(&blocks[113], 2 * 3600, powLimit.GetCompact());
+ BOOST_CHECK(powLimit.GetCompact() != currentPow.GetCompact());
+ BOOST_CHECK_EQUAL(
+ GetNextWorkRequired(&blocks[114], &blkHeaderDummy, params),
+ powLimit.GetCompact());
}
BOOST_AUTO_TEST_SUITE_END()

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