Method testSetNodeValueUndoRedo

tests/test_controller.cpp:125–165

── Test: setNodeValue undo/redo restores data ──

    // ── Test: setNodeValue undo/redo restores data ──
    void testSetNodeValueUndoRedo() {
        int idx = -1;
        for (int i = 0; i < m_doc->tree.nodes.size(); i++) {
            if (m_doc->tree.nodes[i].name == "field_u32") { idx = i; break; }
        }
        QVERIFY(idx >= 0);
        uint64_t addr = m_doc->tree.computeOffset(idx);

        // Original: 0xDEADBEEF
        QByteArray orig = m_doc->provider->readBytes(addr, 4);
        uint32_t origVal;
        memcpy(&origVal, orig.data(), 4);
        QCOMPARE(origVal, (uint32_t)0xDEADBEEF);

        // Write new value
        m_ctrl->setNodeValue(idx, 0, "99");
        QApplication::processEvents();

        uint32_t newVal;
        QByteArray after = m_doc->provider->readBytes(addr, 4);
        memcpy(&newVal, after.data(), 4);
        QCOMPARE(newVal, (uint32_t)99);

        // Undo → should restore original
        m_doc->undoStack.undo();
        QApplication::processEvents();

        QByteArray undone = m_doc->provider->readBytes(addr, 4);
        uint32_t undoneVal;
        memcpy(&undoneVal, undone.data(), 4);
        QCOMPARE(undoneVal, (uint32_t)0xDEADBEEF);

        // Redo → should restore new value
        m_doc->undoStack.redo();
        QApplication::processEvents();

        QByteArray redone = m_doc->provider->readBytes(addr, 4);
        uint32_t redoneVal;
        memcpy(&redoneVal, redone.data(), 4);
        QCOMPARE(redoneVal, (uint32_t)99);
    }

    // ── Test: setNodeValue on Float field ──
    void testSetNodeValueFloat() {