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diff --git a/indra/newview/tests/llscripteditorws_test.cpp b/indra/newview/tests/llscripteditorws_test.cpp
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+++ b/indra/newview/tests/llscripteditorws_test.cpp
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+/**
+ * @file llscripteditorws_test.cpp
+ * @brief Headless test fixture for LLScriptEditorWSServer with fake connection
+ *
+ * $LicenseInfo:firstyear=2026&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2026, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#include "../llviewerprecompiledheaders.h"
+#include "../llscripteditorws.h"
+#include "../test/lltut.h"
+
+namespace
+{
+class FakeScriptEditorWSConnection : public LLScriptEditorWSConnection
+{
+public:
+    explicit FakeScriptEditorWSConnection(const LLWebsocketMgr::WSServer::ptr_t& server)
+        : LLScriptEditorWSConnection(server, LLWebsocketMgr::connection_h())
+    {
+    }
+
+    using LLJSONRPCConnection::processMessage;
+};
+
+class HeadlessScriptEditorWSServer : public LLScriptEditorWSServer
+{
+public:
+    HeadlessScriptEditorWSServer()
+        : LLScriptEditorWSServer("script_editor_ws_test_server", 0, true)
+    {
+    }
+
+    using LLScriptEditorWSServer::setupConnectionMethods;
+};
+}
+
+namespace tut
+{
+    struct script_editor_ws_test_data
+    {
+        std::shared_ptr<HeadlessScriptEditorWSServer> mServer;
+        std::shared_ptr<FakeScriptEditorWSConnection> mConnection;
+
+        script_editor_ws_test_data()
+        {
+            mServer = std::make_shared<HeadlessScriptEditorWSServer>();
+            mConnection = std::make_shared<FakeScriptEditorWSConnection>(mServer);
+            mServer->setupConnectionMethods(mConnection);
+        }
+    };
+
+    typedef test_group<script_editor_ws_test_data> script_editor_ws_test_group;
+    typedef script_editor_ws_test_group::object script_editor_ws_test_object;
+    script_editor_ws_test_group script_editor_ws_tests("LLScriptEditorWSServer");
+
+    template<> template<>
+    void script_editor_ws_test_object::test<1>()
+    {
+        set_test_name("headless fixture constructs server and fake connection");
+        ensure("server should be created", mServer != nullptr);
+        ensure("fake connection should be created", mConnection != nullptr);
+    }
+
+    template<> template<>
+    void script_editor_ws_test_object::test<2>()
+    {
+        set_test_name("fake connection can drive JSON-RPC notification dispatch");
+
+        bool called = false;
+        mConnection->registerMethod(
+            "fixture.echo",
+            [&](const std::string& method, const LLSD& id, const LLSD& params) -> LLSD
+            {
+                called = true;
+                ensure_equals("method should match", method, "fixture.echo");
+                ensure("notification id should be undefined", id.isUndefined());
+                ensure_equals("payload should be forwarded", params["value"].asString(), "ok");
+                return LLSD();
+            });
+
+        LLSD params;
+        params["value"] = "ok";
+        LLSD notification = LLJSONRPCConnection::makeEnvelope(
+            LLSD(),
+            "fixture.echo",
+            params,
+            LLSD(),
+            LLSD());
+
+        mConnection->processMessage(notification);
+        ensure("fixture handler should be invoked", called);
+    }
+
+    template<> template<>
+    void script_editor_ws_test_object::test<3>()
+    {
+        set_test_name("fixture includes default session.ping handler");
+
+        LLSD params;
+        params["timestamp"] = 123;
+        LLSD notification = LLJSONRPCConnection::makeEnvelope(
+            LLSD(),
+            "system.ping",
+            params,
+            LLSD(),
+            LLSD());
+
+        mConnection->processMessage(notification);
+        ensure("session.ping dispatch should complete in headless mode", true);
+    }
+}