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Add unit tests for next difficulty calculations

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Split GetNextWorkRequired() into two functions to allow the difficulty calculations to
be tested without requiring a full blockchain.
Add unit tests to cover basic difficulty calculation, plus each of the min/max actual
time, and maximum difficulty target conditions.
This commit is contained in:
Ross Nicoll
2015-02-21 12:57:44 +00:00
parent aaba10f275
commit 34e5015cd2
4 changed files with 74 additions and 1 deletions
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7
src/pow.cpp
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@@ -48,8 +48,13 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
pindexFirst = pindexFirst->pprev;
assert(pindexFirst);
return CalculateNextWorkRequired(pindexLast, pindexFirst->GetBlockTime());
}
unsigned int CalculateNextWorkRequired(const CBlockIndex* pindexLast, int64_t nFirstBlockTime)
{
// Limit adjustment step
int64_t nActualTimespan = pindexLast->GetBlockTime() - pindexFirst->GetBlockTime();
int64_t nActualTimespan = pindexLast->GetBlockTime() - nFirstBlockTime;
LogPrintf(" nActualTimespan = %d before bounds\n", nActualTimespan);
if (nActualTimespan < Params().TargetTimespan()/4)
nActualTimespan = Params().TargetTimespan()/4;