Most of all, tests! Nothing gives me more absolute peace of mind about my code than doing a make test and watching all the tests pass. If the tests pass, and I can't think of any more tests that might break, then the code is complete and I am happy. If I need to make changes for any reason, the tests will tell me if I accidentally break anything. The more code I write, the more I feel like coding without tests is like flying on a trapeze without a safety net.

-- Mike

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