Refactoring is an essential step in test-driven development, providing the necessary feedback that allows your design (and code) to improve as the product develops.

倘若必要的反馈要求你的设计(和代码)在产品开发中得到改进，则重构是测试驱动开发中不可缺少的步骤。

youdao

I believe that this has been largely due to the complementary relationship between domain-driven design, the rich domain model pattern, and test-driven development.

我相信这已很大程度上由于域驱动设计、丰富的域模型模式和测试驱动开发之间相互补充的关系。

youdao

Equally important are the engineering practices of Extreme Programming (XP), particularly test-driven development, simplicity of design, pair programming and re-factoring (upgrading and simplifying) software code.

FORBES: Can Complexity Thinking Fix Capitalism?