cases =
{"场景" "正常流程", "步骤": "输入正确数据", "预期": "功能正常工作"},
{"场景": "异常流程", "步骤" "输入错误数据", "预期": "显示友好错误提示"},
{"场景": "边界测试", "步骤" "输入极限值", "预期" "正确处理边界情况"}
