[test util] CheckPackageMempoolAcceptResult for sanity-checking results

2 files changed, 88 insertions, 0 deletions

diff --git a/src/test/util/txmempool.cpp b/src/test/util/txmempool.cpp
index c945f35d79..c4fbc8dbb3 100644
--- a/src/test/util/txmempool.cpp
+++ b/src/test/util/txmempool.cpp
@@ -11,6 +11,7 @@
 #include <util/check.h>
 #include <util/time.h>
 #include <util/translation.h>
+#include <validation.h>
 
 using node::NodeContext;
 
@@ -36,3 +37,80 @@ CTxMemPoolEntry TestMemPoolEntryHelper::FromTx(const CTransactionRef& tx) const
 {
     return CTxMemPoolEntry{tx, nFee, TicksSinceEpoch<std::chrono::seconds>(time), nHeight, m_sequence, spendsCoinbase, sigOpCost, lp};
 }
+
+std::optional<std::string> CheckPackageMempoolAcceptResult(const Package& txns,
+                                                           const PackageMempoolAcceptResult& result,
+                                                           bool expect_valid,
+                                                           const CTxMemPool* mempool)
+{
+    if (expect_valid) {
+        if (result.m_state.IsInvalid()) {
+            return strprintf("Package validation unexpectedly failed: %s", result.m_state.ToString());
+        }
+    } else {
+        if (result.m_state.IsValid()) {
+            strprintf("Package validation unexpectedly succeeded. %s", result.m_state.ToString());
+        }
+    }
+    if (result.m_state.GetResult() != PackageValidationResult::PCKG_POLICY && txns.size() != result.m_tx_results.size()) {
+        strprintf("txns size %u does not match tx results size %u", txns.size(), result.m_tx_results.size());
+    }
+    for (const auto& tx : txns) {
+        const auto& wtxid = tx->GetWitnessHash();
+        if (result.m_tx_results.count(wtxid) == 0) {
+            return strprintf("result not found for tx %s", wtxid.ToString());
+        }
+
+        const auto& atmp_result = result.m_tx_results.at(wtxid);
+        const bool valid{atmp_result.m_result_type == MempoolAcceptResult::ResultType::VALID};
+        if (expect_valid && atmp_result.m_state.IsInvalid()) {
+            return strprintf("tx %s unexpectedly failed: %s", wtxid.ToString(), atmp_result.m_state.ToString());
+        }
+
+        //m_replaced_transactions should exist iff the result was VALID
+        if (atmp_result.m_replaced_transactions.has_value() != valid) {
+            return strprintf("tx %s result should %shave m_replaced_transactions",
+                                    wtxid.ToString(), valid ? "" : "not ");
+        }
+
+        // m_vsize and m_base_fees should exist iff the result was VALID or MEMPOOL_ENTRY
+        const bool mempool_entry{atmp_result.m_result_type == MempoolAcceptResult::ResultType::MEMPOOL_ENTRY};
+        if (atmp_result.m_base_fees.has_value() != (valid || mempool_entry)) {
+            return strprintf("tx %s result should %shave m_base_fees", wtxid.ToString(), valid || mempool_entry ? "" : "not ");
+        }
+        if (atmp_result.m_vsize.has_value() != (valid || mempool_entry)) {
+            return strprintf("tx %s result should %shave m_vsize", wtxid.ToString(), valid || mempool_entry ? "" : "not ");
+        }
+
+        // m_other_wtxid should exist iff the result was DIFFERENT_WITNESS
+        const bool diff_witness{atmp_result.m_result_type == MempoolAcceptResult::ResultType::DIFFERENT_WITNESS};
+        if (atmp_result.m_other_wtxid.has_value() != diff_witness) {
+            return strprintf("tx %s result should %shave m_other_wtxid", wtxid.ToString(), diff_witness ? "" : "not ");
+        }
+
+        // m_effective_feerate and m_wtxids_fee_calculations should exist iff the result was valid
+        if (atmp_result.m_effective_feerate.has_value() != valid) {
+            return strprintf("tx %s result should %shave m_effective_feerate",
+                                    wtxid.ToString(), valid ? "" : "not ");
+        }
+        if (atmp_result.m_wtxids_fee_calculations.has_value() != valid) {
+            return strprintf("tx %s result should %shave m_effective_feerate",
+                                    wtxid.ToString(), valid ? "" : "not ");
+        }
+
+        if (mempool) {
+            // The tx by txid should be in the mempool iff the result was not INVALID.
+            const bool txid_in_mempool{atmp_result.m_result_type != MempoolAcceptResult::ResultType::INVALID};
+            if (mempool->exists(GenTxid::Txid(tx->GetHash())) != txid_in_mempool) {
+                strprintf("tx %s should %sbe in mempool", wtxid.ToString(), txid_in_mempool ? "" : "not ");
+            }
+            // Additionally, if the result was DIFFERENT_WITNESS, we shouldn't be able to find the tx in mempool by wtxid.
+            if (tx->HasWitness() && atmp_result.m_result_type == MempoolAcceptResult::ResultType::DIFFERENT_WITNESS) {
+                if (mempool->exists(GenTxid::Wtxid(wtxid))) {
+                    strprintf("wtxid %s should not be in mempool", wtxid.ToString());
+                }
+            }
+        }
+    }
+    return std::nullopt;
+}
diff --git a/src/test/util/txmempool.h b/src/test/util/txmempool.h
index 4b0daf0d42..a866d1ce74 100644
--- a/src/test/util/txmempool.h
+++ b/src/test/util/txmempool.h
@@ -5,12 +5,14 @@
 #ifndef BITCOIN_TEST_UTIL_TXMEMPOOL_H
 #define BITCOIN_TEST_UTIL_TXMEMPOOL_H
 
+#include <policy/packages.h>
 #include <txmempool.h>
 #include <util/time.h>
 
 namespace node {
 struct NodeContext;
 }
+struct PackageMempoolAcceptResult;
 
 CTxMemPool::Options MemPoolOptionsForTest(const node::NodeContext& node);
 
@@ -36,4 +38,12 @@ struct TestMemPoolEntryHelper {
     TestMemPoolEntryHelper& SigOpsCost(unsigned int _sigopsCost) { sigOpCost = _sigopsCost; return *this; }
 };
 
+/** Check expected properties for every PackageMempoolAcceptResult, regardless of value. Returns
+ * a string if an error occurs with error populated, nullopt otherwise. If mempool is provided,
+ * checks that the expected transactions are in mempool (this should be set to nullptr for a test_accept).
+*/
+std::optional<std::string>  CheckPackageMempoolAcceptResult(const Package& txns,
+                                                            const PackageMempoolAcceptResult& result,
+                                                            bool expect_valid,
+                                                            const CTxMemPool* mempool);
 #endif // BITCOIN_TEST_UTIL_TXMEMPOOL_H