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    <p><a href="http://www.makinggoodsoftware.com/2009/11/21/tdd-is-not-about-testing/" rel="nofollow">TDD is not about testing</a>. TDD <em>uses</em> tests to drive the design of your code. TDD <em>produces</em> tests as a happy side-effect of designing your code by writing the tests first, but it's not about testing: it isn't a testing methodology and the purpose is not to produce tests.</p> <blockquote> <p>Is test driven development a form of unit testing?</p> </blockquote> <p>No. It is a <em>design</em> methodology.</p> <blockquote> <p>From what I understand in TDD, you write your test first (which fails), write your code and then run your test which should pass.</p> </blockquote> <p>You're missing a very important step. You write your test first, you write your code until your test passes - and then you <strong>refactor</strong>. The tests permit you to refactor <em>safely</em>, ensuring that the desired behavior continues to work while you adjust your design. The tests also guide you to <em>testable</em> code, promoting smaller methods, shorter parameter lists, and overall much simpler design than other methodologies lead you to.</p> <blockquote> <p>Apart from TDD, do you write any other kind of test?</p> </blockquote> <p>When I do, it's usually a sign that I've failed to do TDD properly (but it certainly happens). We have both unit tests and user acceptance tests; both can be written prior to code, but sometimes our user acceptance tests are written later in the development cycle. They shouldn't be, but sometimes they are.</p>
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    1. POIs test driven development a form of unit testing
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    1. USCarl Manaster
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    1. COThanks Carl. Suppose I have a requirement to implement. I will first break down the requirements into cases. For each case I'll write a(or more) test and then I will write the code to fulfill the test(s). Run the test and see that it passes, mean that the code is OK. Now refactor. This process, I understand, allow me to structure and design my code based on the test I wrote.. But in a nutshell, I am writing test(s) to test a case. Although its call TDD, isn't the test being written in TDD testing each case, i.e testing each unit of code although the code is written last?
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    2. CO[When I do, it's usually a sign that I've failed to do TDD properly] Of all the tests I wrote in TDD, those tests only verify each case of my requirement. But I will have to have test that verify whether each case of requirement works well with each other so that the overall requirement is satisfied. How do you cater for that?
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    3. COEither the individual requirements work correctly together (you should strive for this), or they don't. If they don't, that's missing functionality - an unfilled requirement - write a test for it, and make it pass. That's definitely test-driving.
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