Add unit tests for SAO load / unload behaviour

src/server.cpp

@@ -471,8 +471,7 @@ void Server::init()
 	// Must be created before mod loading because we have some inventory creation
 	m_inventory_mgr = std::make_unique<ServerInventoryManager>();
 
-	m_script->loadMod(getBuiltinLuaPath() + DIR_DELIM "init.lua", BUILTIN_MOD_NAME);
-	m_script->checkSetByBuiltin();
+	m_script->loadBuiltin();
 
 	m_gamespec.checkAndLog();
 	m_modmgr->loadMods(m_script);