Function test_undo_basic

src/text_input.rs:3603–3622

()

    #[test]
    fn test_undo_basic() {
        let mut state = TextEditState::default();
        state.text = "hello".to_string();
        state.cursor_pos = 5;

        // Push undo, then modify
        state.push_undo(UndoActionKind::Paste);
        state.insert_text(" world", None);
        assert_eq!(state.text, "hello world");

        // Undo should restore
        assert!(state.undo());
        assert_eq!(state.text, "hello");
        assert_eq!(state.cursor_pos, 5);

        // Redo should restore the edit
        assert!(state.redo());
        assert_eq!(state.text, "hello world");
        assert_eq!(state.cursor_pos, 11);
    }

    #[test]
    fn test_undo_grouping_insert_char() {