tests: Add fuzzing harness for CBlockPolicyEstimator

1 files changed, 15 insertions, 0 deletions

diff --git a/src/test/fuzz/util.h b/src/test/fuzz/util.h
index 9c7b0d47a2..98fe30fcec 100644
--- a/src/test/fuzz/util.h
+++ b/src/test/fuzz/util.h
@@ -8,12 +8,15 @@
 #include <amount.h>
 #include <arith_uint256.h>
 #include <attributes.h>
+#include <consensus/consensus.h>
 #include <optional.h>
+#include <primitives/transaction.h>
 #include <script/script.h>
 #include <serialize.h>
 #include <streams.h>
 #include <test/fuzz/FuzzedDataProvider.h>
 #include <test/fuzz/fuzz.h>
+#include <txmempool.h>
 #include <uint256.h>
 #include <version.h>
 
@@ -97,6 +100,18 @@ NODISCARD inline arith_uint256 ConsumeArithUInt256(FuzzedDataProvider& fuzzed_da
     return UintToArith256(ConsumeUInt256(fuzzed_data_provider));
 }
 
+NODISCARD inline CTxMemPoolEntry ConsumeTxMemPoolEntry(FuzzedDataProvider& fuzzed_data_provider, const CTransaction& tx) noexcept
+{
+    // Avoid:
+    // policy/feerate.cpp:28:34: runtime error: signed integer overflow: 34873208148477500 * 1000 cannot be represented in type 'long'
+    const CAmount fee = ConsumeMoney(fuzzed_data_provider) / static_cast<CAmount>(100);
+    const int64_t time = fuzzed_data_provider.ConsumeIntegral<int64_t>();
+    const unsigned int entry_height = fuzzed_data_provider.ConsumeIntegral<unsigned int>();
+    const bool spends_coinbase = fuzzed_data_provider.ConsumeBool();
+    const unsigned int sig_op_cost = fuzzed_data_provider.ConsumeIntegralInRange<unsigned int>(0, MAX_BLOCK_SIGOPS_COST);
+    return CTxMemPoolEntry{MakeTransactionRef(tx), fee, time, entry_height, spends_coinbase, sig_op_cost, {}};
+}
+
 template <typename T>
 NODISCARD bool MultiplicationOverflow(const T i, const T j) noexcept
 {