Method testExcessiveUndos

tests/test_validation.cpp:1136–1156

    // ── Multiple undos past the beginning don't crash ──

    void testExcessiveUndos() {
        int idx = findNode(m_doc->tree, "field_u32");
        QVERIFY(idx >= 0);

        m_ctrl->setNodeValue(idx, 0, "42");
        QApplication::processEvents();
        QCOMPARE(m_doc->undoStack.count(), 1);

        // Undo once (valid)
        m_doc->undoStack.undo();
        // Undo 50 more times (all no-ops, should not crash)
        for (int i = 0; i < 50; i++)
            m_doc->undoStack.undo();
        QApplication::processEvents();

        // Redo 50 times past the end
        m_doc->undoStack.redo();
        for (int i = 0; i < 50; i++)
            m_doc->undoStack.redo();
        QApplication::processEvents();
    }
};

QTEST_MAIN(TestValidationController)