CppEditor: Introduce testing infrastructure for symbol renaming

Also add two example tests.

Change-Id: Ia76c4d92e7643971c1f201081b3df1f77f1e89a5
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/cppeditor/cpprenaming_test.h

@@ -0,0 +1,19 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#pragma once
+
+#include <QObject>
+
+namespace CppEditor::Internal::Tests {
+
+class GlobalRenamingTest : public QObject
+{
+    Q_OBJECT
+
+private slots:
+    void test_data();
+    void test();
+};
+
+} // namespace CppEditor::Internal::Tests