test-driven-development

TDD discipline - before implementing any feature or fixing any bug. Iron law: no production code without a failing test. Write the test, watch it fail, write minimal code to pass; red-green-refactor. Exceptions (throwaway prototypes, generated code, config files) require user consent. / 测试驱动开发纪律——实现任何功能或修复任何 bug、在写实现代码之前使用。铁律：没有失败测试就没有生产代码。先写测试、看它失败、再写最小实现让它通过；红-绿-重构循环。例外（一次性原型、生成代码、配置文件）需征得用户同意。