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Test Driven Development

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What is TDD ?

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The Red/Green/Refactor Cycle Refactor and clean the code Write test and watch it fails Write minimal code that makes that test pass

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Write test.

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Run test, watch it fails.

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Write minimal code, pass the test.

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Run test, watch it fails.

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Write minimal code, pass the test.

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Run test, watch it fails.

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Refactor is the key

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Run test, watch it fails.

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Write minimal code, pass the test.

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Run test, watch it fails.

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Write minimal code, pass the test.

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Run test, watch it fails.

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Even more refactor.

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Run test, watch it fails.

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Write minimal code, pass the test.

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Run test, watch it fails.

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Ship code to production.

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Refactor is the key, remember?

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Refactoring is a disciplined technique for restructuring an existing body of code, altering its internal structure without changing its external behavior. - Martin Fowler

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Run test, watch it fails.

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Why should we use TDD ?

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TDD start with the end of mind, and walks you through what is the next step you have to do to get the code working

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75% of a developer’s time is spent on debugging

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TDD eradicates fear of change - Eric Elliott

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40%-80% fewer bugs in production* *https:/ /www.researchgate.net/publication/3249271_Guest_Editors'_Introduction_TDD--The_Art_ of_Fearless_Programming

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Source https://www.codecademy.com/articles/tdd-red- green-refactor https://blog.cleancoder.com/uncle-bob/2014/1 2/17/TheCyclesOfTDD.html https://medium.com/javascript-scene/tdd-chan ged-my-life-5af0ce099f80 https://coralogix.com/log-analytics-blog/this-is- what-your-developers-are-doing-75-of-the-time -and-this-is-the-cost-you-pay/ https://pixabay.com/vectors/wow-bang-explosi on-pow-blast-155268/ https://heeris.id.au/2013/this-is-why-you-shoul dnt-interrupt-a-programmer/