[dpark]

collyw is right. “Tests don’t take much time” is bullshit. Testing a feature typically takes as long as writing the feature, whether you pay that cost with unit tests, end-to-end tests, or ad hoc testing. (As hoc actually costs less up front but eventually many times more over the life of the product.)

If you’re very familiar with testing and/or doing TDD, you might include your testing costs in your estimate, but you still have the cost to pay. And if you write good testing up front, it will cost more up front.