A More Scientific Approach to the Costs of Testing

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Sometimes people level the “tests are too expensive” argument. Kent Beck (Mr. Extreme Programming) provides a refreshingly scientific journey into why the lifetime cost of tests is small.

One main point is that most failed test runs are caused by a single failure, and those single failures usually aren’t too hard/expensive to fix.

It’s a good caution against using average failure rates when calculating how much tests hurt you.

[link] Large numbers of failed tests are rare

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