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tests: refactor versionbits unit test

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Base the unit test directly on `VersionBitsConditionChecker`, slightly
improving coverage, in particular adding coverage for the the logic
regarding setting the TOP_BITS.
This commit is contained in:
Anthony Towns 2023-12-17 21:12:32 +10:00
parent 525c00f91b
commit 2e4e9b9608
2 changed files with 52 additions and 42 deletions
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92
src/test/versionbits_tests.cpp
View file

@ -16,39 +16,41 @@
/* Define a virtual block time, one block per 10 minutes after Nov 14 2014, 0:55:36am */
static int32_t TestTime(int nHeight) { return 1415926536 + 600 * nHeight; }
class TestConditionChecker : public AbstractThresholdConditionChecker
class TestConditionChecker final : public VersionBitsConditionChecker
{
private:
mutable ThresholdConditionCache cache;
public:
int64_t BeginTime() const override { return TestTime(10000); }
int64_t EndTime() const override { return TestTime(20000); }
int Period() const override { return 1000; }
int Threshold() const override { return 900; }
bool Condition(const CBlockIndex* pindex) const override { return (pindex->nVersion & 0x100); }
// constructor is implicit to allow for easier initialization of vector<TestConditionChecker>
explicit(false) TestConditionChecker(const Consensus::BIP9Deployment& dep) : VersionBitsConditionChecker{dep} { }
~TestConditionChecker() override = default;
ThresholdState GetStateFor(const CBlockIndex* pindexPrev) const { return AbstractThresholdConditionChecker::GetStateFor(pindexPrev, cache); }
int GetStateSinceHeightFor(const CBlockIndex* pindexPrev) const { return AbstractThresholdConditionChecker::GetStateSinceHeightFor(pindexPrev, cache); }
ThresholdState StateFor(const CBlockIndex* pindexPrev) const { return AbstractThresholdConditionChecker::GetStateFor(pindexPrev, cache); }
int StateSinceHeightFor(const CBlockIndex* pindexPrev) const { return AbstractThresholdConditionChecker::GetStateSinceHeightFor(pindexPrev, cache); }
void clear() { cache.clear(); }
};
class TestDelayedActivationConditionChecker : public TestConditionChecker
namespace {
struct Deployments
{
public:
int MinActivationHeight() const override { return 15000; }
};
class TestAlwaysActiveConditionChecker : public TestConditionChecker
{
public:
int64_t BeginTime() const override { return Consensus::BIP9Deployment::ALWAYS_ACTIVE; }
};
class TestNeverActiveConditionChecker : public TestConditionChecker
{
public:
int64_t BeginTime() const override { return Consensus::BIP9Deployment::NEVER_ACTIVE; }
const Consensus::BIP9Deployment normal{
.bit = 8,
.nStartTime = TestTime(10000),
.nTimeout = TestTime(20000),
.min_activation_height = 0,
.period = 1000,
.threshold = 900,
};
Consensus::BIP9Deployment always, never, delayed;
Deployments()
{
delayed = normal; delayed.min_activation_height = 15000;
always = normal; always.nStartTime = Consensus::BIP9Deployment::ALWAYS_ACTIVE;
never = normal; never.nStartTime = Consensus::BIP9Deployment::NEVER_ACTIVE;
}
};
}
#define CHECKERS 6
@ -58,22 +60,28 @@ class VersionBitsTester
// A fake blockchain
std::vector<CBlockIndex*> vpblock;
// Used to automatically set the top bits for manual calls to Mine()
const int32_t nVersionBase{0};
// Setup BIP9Deployment structs for the checkers
const Deployments test_deployments;
// 6 independent checkers for the same bit.
// The first one performs all checks, the second only 50%, the third only 25%, etc...
// This is to test whether lack of cached information leads to the same results.
TestConditionChecker checker[CHECKERS];
std::vector<TestConditionChecker> checker{CHECKERS, {test_deployments.normal}};
// Another 6 that assume delayed activation
TestDelayedActivationConditionChecker checker_delayed[CHECKERS];
std::vector<TestConditionChecker> checker_delayed{CHECKERS, {test_deployments.delayed}};
// Another 6 that assume always active activation
TestAlwaysActiveConditionChecker checker_always[CHECKERS];
std::vector<TestConditionChecker> checker_always{CHECKERS, {test_deployments.always}};
// Another 6 that assume never active activation
TestNeverActiveConditionChecker checker_never[CHECKERS];
std::vector<TestConditionChecker> checker_never{CHECKERS, {test_deployments.never}};
// Test counter (to identify failures)
int num{1000};
public:
VersionBitsTester(FastRandomContext& rng) : m_rng{rng} {}
explicit VersionBitsTester(FastRandomContext& rng, int32_t nVersionBase=0) : m_rng{rng}, nVersionBase{nVersionBase} { }
VersionBitsTester& Reset() {
// Have each group of tests be counted by the 1000s part, starting at 1000
@ -83,10 +91,10 @@ public:
delete vpblock[i];
}
for (unsigned int i = 0; i < CHECKERS; i++) {
checker[i] = TestConditionChecker();
checker_delayed[i] = TestDelayedActivationConditionChecker();
checker_always[i] = TestAlwaysActiveConditionChecker();
checker_never[i] = TestNeverActiveConditionChecker();
checker[i].clear();
checker_delayed[i].clear();
checker_always[i].clear();
checker_never[i].clear();
}
vpblock.clear();
return *this;
@ -102,7 +110,7 @@ public:
pindex->nHeight = vpblock.size();
pindex->pprev = Tip();
pindex->nTime = nTime;
pindex->nVersion = nVersion;
pindex->nVersion = (nVersionBase | nVersion);
pindex->BuildSkip();
vpblock.push_back(pindex);
}
@ -119,10 +127,10 @@ public:
const CBlockIndex* tip = Tip();
for (int i = 0; i < CHECKERS; i++) {
if (m_rng.randbits(i) == 0) {
BOOST_CHECK_MESSAGE(checker[i].GetStateSinceHeightFor(tip) == height, strprintf("Test %i for StateSinceHeight", num));
BOOST_CHECK_MESSAGE(checker_delayed[i].GetStateSinceHeightFor(tip) == height_delayed, strprintf("Test %i for StateSinceHeight (delayed)", num));
BOOST_CHECK_MESSAGE(checker_always[i].GetStateSinceHeightFor(tip) == 0, strprintf("Test %i for StateSinceHeight (always active)", num));
BOOST_CHECK_MESSAGE(checker_never[i].GetStateSinceHeightFor(tip) == 0, strprintf("Test %i for StateSinceHeight (never active)", num));
BOOST_CHECK_MESSAGE(checker[i].StateSinceHeightFor(tip) == height, strprintf("Test %i for StateSinceHeight", num));
BOOST_CHECK_MESSAGE(checker_delayed[i].StateSinceHeightFor(tip) == height_delayed, strprintf("Test %i for StateSinceHeight (delayed)", num));
BOOST_CHECK_MESSAGE(checker_always[i].StateSinceHeightFor(tip) == 0, strprintf("Test %i for StateSinceHeight (always active)", num));
BOOST_CHECK_MESSAGE(checker_never[i].StateSinceHeightFor(tip) == 0, strprintf("Test %i for StateSinceHeight (never active)", num));
}
}
num++;
@ -145,10 +153,10 @@ public:
const CBlockIndex* pindex = Tip();
for (int i = 0; i < CHECKERS; i++) {
if (m_rng.randbits(i) == 0) {
ThresholdState got = checker[i].GetStateFor(pindex);
ThresholdState got_delayed = checker_delayed[i].GetStateFor(pindex);
ThresholdState got_always = checker_always[i].GetStateFor(pindex);
ThresholdState got_never = checker_never[i].GetStateFor(pindex);
ThresholdState got = checker[i].StateFor(pindex);
ThresholdState got_delayed = checker_delayed[i].StateFor(pindex);
ThresholdState got_always = checker_always[i].StateFor(pindex);
ThresholdState got_never = checker_never[i].StateFor(pindex);
// nHeight of the next block. If vpblock is empty, the next (ie first)
// block should be the genesis block with nHeight == 0.
int height = pindex == nullptr ? 0 : pindex->nHeight + 1;
@ -180,7 +188,7 @@ BOOST_AUTO_TEST_CASE(versionbits_test)
{
for (int i = 0; i < 64; i++) {
// DEFINED -> STARTED after timeout reached -> FAILED
VersionBitsTester(m_rng).TestDefined().TestStateSinceHeight(0)
VersionBitsTester(m_rng, VERSIONBITS_TOP_BITS).TestDefined().TestStateSinceHeight(0)
.Mine(1, TestTime(1), 0x100).TestDefined().TestStateSinceHeight(0)
.Mine(11, TestTime(11), 0x100).TestDefined().TestStateSinceHeight(0)
.Mine(989, TestTime(989), 0x100).TestDefined().TestStateSinceHeight(0)

2
src/versionbits_impl.h
View file

@ -38,6 +38,8 @@ protected:
virtual int Threshold() const =0;
public:
virtual ~AbstractThresholdConditionChecker() = default;
/** Returns the numerical statistics of an in-progress BIP9 softfork in the period including pindex
* If provided, signalling_blocks is set to true/false based on whether each block in the period signalled
*/