Method testSetNodeValueWritesData

tests/test_controller.cpp:98–122

── Test: setNodeValue writes bytes to provider ──

    // ── Test: setNodeValue writes bytes to provider ──
    void testSetNodeValueWritesData() {
        // Find field_u32 (index 1, child of root at index 0)
        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);

        // Verify original value in provider
        uint64_t addr = m_doc->tree.computeOffset(idx);
        QByteArray origBytes = m_doc->provider->readBytes(addr, 4);
        uint32_t origVal;
        memcpy(&origVal, origBytes.data(), 4);
        QCOMPARE(origVal, (uint32_t)0xDEADBEEF);

        // Write new value "42" (decimal)
        m_ctrl->setNodeValue(idx, 0, "42");
        QApplication::processEvents();

        // Read back: should be 42 in little-endian
        QByteArray newBytes = m_doc->provider->readBytes(addr, 4);
        uint32_t newVal;
        memcpy(&newVal, newBytes.data(), 4);
        QCOMPARE(newVal, (uint32_t)42);
    }

    // ── Test: setNodeValue undo/redo restores data ──
    void testSetNodeValueUndoRedo() {