# Test-implementation coupling > 단위 테스트와 구현 사이의 결합. [단위 테스트](https://wiki.g15e.com/pages/Unit%20test.txt)와 구현 사이의 <결합>. > The test above is not one I would expect to live a long time. It is deeply concerned with the implementation of our operation, rather than its externally visible behavior. --Chapter 13, [Test-driven development: by example](https://wiki.g15e.com/pages/Test-driven%20development%20-%20By%20example.txt) ## See also - [Bad smells in test](https://wiki.g15e.com/pages/Bad%20smells%20in%20test.txt) -