From 4e0aa1835b3e980ceda29ec90e7115d7fef53f51 Mon Sep 17 00:00:00 2001
From: Ryan Ofsky <ryan@ofsky.org>
Date: Fri, 24 Jan 2025 19:01:49 -0500
Subject: [PATCH] test: Add test for IPC serialization bug

Add regression test for serialization bug in IPC mining code that is not
currently being called anywhere reported:

https://github.com/Sjors/bitcoin/issues/71
https://github.com/chaincodelabs/libmultiprocess/issues/122
---
 src/test/ipc_test.capnp | 1 +
 src/test/ipc_test.cpp   | 4 ++++
 src/test/ipc_test.h     | 2 ++
 3 files changed, 7 insertions(+)

diff --git a/src/test/ipc_test.capnp b/src/test/ipc_test.capnp
index 46cd08b94a2..7fd59cf5882 100644
--- a/src/test/ipc_test.capnp
+++ b/src/test/ipc_test.capnp
@@ -20,4 +20,5 @@ interface FooInterface $Proxy.wrap("FooImplementation") {
     passTransaction @3 (arg :Data) -> (result :Data);
     passVectorChar @4 (arg :Data) -> (result :Data);
     passBlockState @5 (arg :Mining.BlockValidationState) -> (result :Mining.BlockValidationState);
+    passScript @6 (arg :Data) -> (result :Data);
 }
diff --git a/src/test/ipc_test.cpp b/src/test/ipc_test.cpp
index af374349802..d78d6695e7b 100644
--- a/src/test/ipc_test.cpp
+++ b/src/test/ipc_test.cpp
@@ -121,6 +121,10 @@ void IpcPipeTest()
     BOOST_CHECK_EQUAL(bs3.GetRejectReason(), bs4.GetRejectReason());
     BOOST_CHECK_EQUAL(bs3.GetDebugMessage(), bs4.GetDebugMessage());
 
+    auto script1{CScript() << OP_11};
+    auto script2{foo->passScript(script1)};
+    BOOST_CHECK_EQUAL(HexStr(script1), HexStr(script2));
+
     // Test cleanup: disconnect pipe and join thread
     disconnect_client();
     thread.join();
diff --git a/src/test/ipc_test.h b/src/test/ipc_test.h
index 2d215a20f1b..2304d8a4c0d 100644
--- a/src/test/ipc_test.h
+++ b/src/test/ipc_test.h
@@ -6,6 +6,7 @@
 #define BITCOIN_TEST_IPC_TEST_H
 
 #include <primitives/transaction.h>
+#include <script/script.h>
 #include <univalue.h>
 #include <util/fs.h>
 #include <validation.h>
@@ -19,6 +20,7 @@ public:
     CTransactionRef passTransaction(CTransactionRef t) { return t; }
     std::vector<char> passVectorChar(std::vector<char> v) { return v; }
     BlockValidationState passBlockState(BlockValidationState s) { return s; }
+    CScript passScript(CScript s) { return s; }
 };
 
 void IpcPipeTest();