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Intro to Test Driven Development

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Jim Holmes Executive Consultant, Guidepost Systems LLC [email protected] GitHub: JimHolmes Xbox: FrazzledDad Blogs: http://GuidepostSystems.com http://FrazzledDad.com Coding for Non-Coders: Lesson 1—Course Introduction Who am I?

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Slides: https://speakerdeck.com/ jimholmes/intro-to-tdd

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How do you know your stuff works?

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How do you know you built the right thing?

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How do you keep your stuff working?

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Goals for today: Talk about building test cases Spend some writing tests and code

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Level Set: What are all y’all working with? (testing, specs, etc.)

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Why writing tests matters

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Correctness

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Maintainability

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Why writing tests first matters

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Stay lean

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Focus on value

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Red Refactor Green

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Think Refactor Green Red

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The problem

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Customer wants a payroll system

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Today’s work: Figure payroll for hourly workers

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Let’s write some specs!

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Hours Worked Hourly Rate Wages Should Be 0 10 0 1 10 10 40 10 400 41 10 415 60 10 700 61 10 Error. Requires supervisor review (Business rule!) -1 10 Error. Do not process 1 -1 Error. Do not process 10 Max Value (500) 10 * max value. 10 Max Value + 1 Error. Requires supervisor review (Business rule!) 10 1 10

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Let’s write some tests!