From what I know, Andrey (the poster) is pretty neutral on TD, maybe even a proponent. He's saying you should have an interface in mind when you start to write

From what I know, Andrey (the poster) is pretty neutral on TD, maybe even a proponent. He's saying you should have an interface in mind when you start to write unit tests. Sometimes you can do that before writing code. Other times, exploring with a REPL first is better.