Have you been in cases where TDD increased development time? <p>I was reading <a href="http://stackoverflow.com/questions/2512504/tdd-how-to-start-really-thinking-tdd">TDD - How to start really thinking TDD?</a> and I noticed many of the answers indicate that tests + application should take less time than just writing the application. In my experience, this is not true. My problem though is that some 90% of the code I write has a TON of operating system calls. The time spent to actually mock these up takes <em>much</em> longer than just writing the code in the first place. Sometimes 4 or 5 times as long to write the test as to write the actual code.</p> <p>I'm curious if there are other developers in this kind of a scenario.</p>