[snorberhuis]

Once you get experience in having a TDD approach, my view is that you don't lose time with testing. Writing tests is a way to formulate your thought and assumptions. You implement this in your code and you selectively run these using the tests. You reduce the size of the code that you think about to small building blocks. This makes you much faster-writing code. The amount of rework getting components to work together is reduced allowing you to implement features faster.

Only if your code is complex, will you need a complex test suite. If your code is complex you won't be fast implementing features anyways. TDD will help you keep your code simple.

[collyw]

Of course you loose time testing. Maybe not writing the tests themselves, but usually setting up data for tests is the most time consuming part.