Add missing tests stubs

tests/CMakeLists.txt

@@ -12,6 +12,7 @@ logos_test(
     TEST_SOURCES
         main.cpp
         test_blockchain.cpp
+        event_stubs.cpp
     MOCK_C_SOURCES
         mocks/mock_logos_blockchain.cpp
     EXTRA_INCLUDES
@@ -35,6 +36,7 @@ if(LIBLOGOS_BLOCKCHAIN_PATH)
         TEST_SOURCES
             main.cpp
             test_blockchain.cpp
+            event_stubs.cpp
         EXTRA_INCLUDES
             ../lib
         EXTRA_LINK_LIBS

tests/event_stubs.cpp

@@ -0,0 +1,17 @@
+// Test-only definitions for `logos_events:` methods.
+//
+// In a real build the cpp-generator emits the bodies of every `logos_events:`
+// method into a sidecar `<name>_events.cpp` (each forwards through
+// `emitEventImpl_`). The unit/integration test targets compile the module
+// source directly without running codegen, so those bodies are absent and the
+// link fails on `on_new_block_callback`'s reference to `newBlock`.
+//
+// `emitEventImpl_` is a no-op outside a framework-provisioned context (no emit
+// callback is installed in tests), so forwarding here mirrors production
+// behaviour while keeping the test build link-complete.
+
+#include "logos_blockchain_module.h"
+
+void LogosBlockchainModule::newBlock(const std::string& blockJson) {
+    emitEventImpl_("newBlock", nullptr);
+}