1 files changed, 67 insertions, 0 deletions
diff --git a/src/test/ipc_test.cpp b/src/test/ipc_test.cpp
new file mode 100644
index 0000000000..ce4edaceb0
--- /dev/null
+++ b/src/test/ipc_test.cpp
@@ -0,0 +1,67 @@
+// Copyright (c) 2023 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <logging.h>
+#include <mp/proxy-types.h>
+#include <test/ipc_test.capnp.h>
+#include <test/ipc_test.capnp.proxy.h>
+#include <test/ipc_test.h>
+
+#include <future>
+#include <kj/common.h>
+#include <kj/memory.h>
+#include <kj/test.h>
+
+#include <boost/test/unit_test.hpp>
+
+//! Unit test that tests execution of IPC calls without actually creating a
+//! separate process. This test is primarily intended to verify behavior of type
+//! conversion code that converts C++ objects to Cap'n Proto messages and vice
+//! versa.
+//!
+//! The test creates a thread which creates a FooImplementation object (defined
+//! in ipc_test.h) and a two-way pipe accepting IPC requests which call methods
+//! on the object through FooInterface (defined in ipc_test.capnp).
+void IpcTest()
+{
+    // Setup: create FooImplemention object and listen for FooInterface requests
+    std::promise<std::unique_ptr<mp::ProxyClient<gen::FooInterface>>> foo_promise;
+    std::function<void()> disconnect_client;
+    std::thread thread([&]() {
+        mp::EventLoop loop("IpcTest", [](bool raise, const std::string& log) { LogPrintf("LOG%i: %s\n", raise, log); });
+        auto pipe = loop.m_io_context.provider->newTwoWayPipe();
+
+        auto connection_client = std::make_unique<mp::Connection>(loop, kj::mv(pipe.ends[0]));
+        auto foo_client = std::make_unique<mp::ProxyClient<gen::FooInterface>>(
+            connection_client->m_rpc_system.bootstrap(mp::ServerVatId().vat_id).castAs<gen::FooInterface>(),
+            connection_client.get(), /* destroy_connection= */ false);
+        foo_promise.set_value(std::move(foo_client));
+        disconnect_client = [&] { loop.sync([&] { connection_client.reset(); }); };
+
+        auto connection_server = std::make_unique<mp::Connection>(loop, kj::mv(pipe.ends[1]), [&](mp::Connection& connection) {
+            auto foo_server = kj::heap<mp::ProxyServer<gen::FooInterface>>(std::make_shared<FooImplementation>(), connection);
+            return capnp::Capability::Client(kj::mv(foo_server));
+        });
+        connection_server->onDisconnect([&] { connection_server.reset(); });
+        loop.loop();
+    });
+    std::unique_ptr<mp::ProxyClient<gen::FooInterface>> foo{foo_promise.get_future().get()};
+
+    // Test: make sure arguments were sent and return value is received
+    BOOST_CHECK_EQUAL(foo->add(1, 2), 3);
+
+    COutPoint txout1{Txid::FromUint256(uint256{100}), 200};
+    COutPoint txout2{foo->passOutPoint(txout1)};
+    BOOST_CHECK(txout1 == txout2);
+
+    UniValue uni1{UniValue::VOBJ};
+    uni1.pushKV("i", 1);
+    uni1.pushKV("s", "two");
+    UniValue uni2{foo->passUniValue(uni1)};
+    BOOST_CHECK_EQUAL(uni1.write(), uni2.write());
+
+    // Test cleanup: disconnect pipe and join thread
+    disconnect_client();
+    thread.join();
+}