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-Which is test-first development. The key idea is that any program

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-feature that doesn't have an automatic test simply does not exist. If

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-there is a feature, you need to write a test for the

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-feature before. So, what developers do is to create unit tests for

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-each such piece of functionality even before the functionality is implemented.

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-And of course, when you run this test, they will fail. But

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-the beauty of it is that, as you write your code and

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-you add more and more fractionality to the feature that you're developing,

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-these test cases are going to start to pass.

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-And that's extremely rewarding because it gives you immediate

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-feedback, again feedback on the fact that you're

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-developing the code in the right way. As soon

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-as you write it, you will know. And if you write a piece of code and the

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-test says still fail, that means that the

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-code is not doing what it's supposed to do.