"Why should I, it works..."
The idea of Test-After Development is to write a set of automated white-box tests after writing your production code. Since probably every CS student in the world has learned that unit tests are a good idea, you'd expect unit testing to be an industry state standard for quite a while now. Interestingly the idea of automated unit and integration test is lately becoming more popular due to the widespread use of Test-Driven Development.
So why do we need Test-Driven Development to be able to efficiently write automated unit tests?
- If you write your code first and don't think about how to test the code, the code will not be testable. Thus testing becomes expensive and frustrating. Test-Driven Development will guide your software design by the old mantra of "how-do-I-want-to-use-this-class", leading to a highly decoupled design.
- When you write your tests, you'll discover a lot of errors. But instead of the red bar in Test-Driven Development, which you expect, the red bar in Test-After Development is the demotivating sword of reality.
- The most important reason why I have never seen Test-After Development work, is that developers just don't believe in errors once they wrote the code. This seems to be an eternal wisdom of software development psychology: once the code works, why bother testing it? Let's just implement the next feature.