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tests: make fuzz tests (mostly) deterministic with fixed seed

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This commit is contained in:
Pieter Wuille 2024-03-15 14:32:20 -04:00
parent 2c91330dd6
commit 97e16f5704
2 changed files with 10 additions and 1 deletions
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6
src/test/fuzz/fuzz.cpp
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@ -102,6 +102,12 @@ void ResetCoverageCounters() {}
void initialize() void initialize()
{ {
// By default, make the RNG deterministic with a fixed seed. This will affect all
// randomness during the fuzz test, except:
// - GetStrongRandBytes(), which is used for the creation of private key material.
// - Creating a BasicTestingSetup or derived class will switch to a random seed.
SeedRandomForTest(SeedRand::ZEROS);
// Terminate immediately if a fuzzing harness ever tries to create a socket. // Terminate immediately if a fuzzing harness ever tries to create a socket.
// Individual tests can override this by pointing CreateSock to a mocked alternative. // Individual tests can override this by pointing CreateSock to a mocked alternative.
CreateSock = [](int, int, int) -> std::unique_ptr<Sock> { std::terminate(); }; CreateSock = [](int, int, int) -> std::unique_ptr<Sock> { std::terminate(); };

5
src/test/util/setup_common.cpp
View file

@ -145,6 +145,10 @@ BasicTestingSetup::BasicTestingSetup(const ChainType chainType, const std::vecto
} }
} }
// Use randomly chosen seed for deterministic PRNG, so that (by default) test
// data directories use a random name that doesn't overlap with other tests.
SeedRandomForTest(SeedRand::SEED);
if (!m_node.args->IsArgSet("-testdatadir")) { if (!m_node.args->IsArgSet("-testdatadir")) {
// By default, the data directory has a random name // By default, the data directory has a random name
const auto rand_str{g_insecure_rand_ctx_temp_path.rand256().ToString()}; const auto rand_str{g_insecure_rand_ctx_temp_path.rand256().ToString()};
@ -178,7 +182,6 @@ BasicTestingSetup::BasicTestingSetup(const ChainType chainType, const std::vecto
gArgs.ForceSetArg("-datadir", fs::PathToString(m_path_root)); gArgs.ForceSetArg("-datadir", fs::PathToString(m_path_root));
SelectParams(chainType); SelectParams(chainType);
SeedRandomForTest();
if (G_TEST_LOG_FUN) LogInstance().PushBackCallback(G_TEST_LOG_FUN); if (G_TEST_LOG_FUN) LogInstance().PushBackCallback(G_TEST_LOG_FUN);
InitLogging(*m_node.args); InitLogging(*m_node.args);
AppInitParameterInteraction(*m_node.args); AppInitParameterInteraction(*m_node.args);