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shared by Sarah HL on 29 Jun 09 - Cached

They effectively communicate in an executable format how to use the software. They also prevent tendencies to over-build the system based on speculation. When all the tests pass, you know you're done!
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Test-driven development is a lot more fun than writing tests after the code seems to be working
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Do I have to write a test for everything? No, just test everything that could reasonably break.
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If something is difficult to test, it's usually an opportunity for a design improvement.
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Frequent testing gives you confidence that your changes didn't break anything and generally lowers the stress of programming in the dark.
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Run all your unit tests as often as possible, ideally every time the code is changed
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For larger systems, you may just run specific test suites that are relevant to the code you're working on.
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write a failing test that exposes the defect. When the test passes, you know the defect is fixed!
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Don't forget to use this as a learning opportunity. Perhaps the defect could have been prevented by being more aggressive about testing everything that could reasonably break.
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