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Tdd   let the tests be your guide.pptx
Tdd   let the tests be your guide.pptx
Tdd   let the tests be your guide.pptx
Tdd   let the tests be your guide.pptx
Tdd   let the tests be your guide.pptx
Tdd   let the tests be your guide.pptx
Tdd   let the tests be your guide.pptx
Tdd   let the tests be your guide.pptx
Tdd   let the tests be your guide.pptx
Tdd   let the tests be your guide.pptx
Tdd   let the tests be your guide.pptx
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Tdd let the tests be your guide.pptx

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How TDD is done

How TDD is done

Published in: Technology, Education
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Transcript

  • 1. Test-Driven DevelopmentLet the tests be your guide
  • 2. It startswiththe test
  • 3. Benefits of TDD¡  All the benefits of unit testing plus …¡  It becomes hard to create errors in the first place ¡  You almost have to try to create errors¡  Better matches the business requirements¡  It does what it is supposed to do ¡  It must because we only write tests that satisfy requirements¡  Encourages communication with the business¡  It eliminates gold plating
  • 4. Red, green, refactor¡  asdf
  • 5. The red phase
  • 6. You want to write positivetests and negative tests¡  Negative tests involve values that are outside acceptable ranges. ¡  They should fail ¡  Youre testing to make sure that they do¡  Positive tests are ones that should pass
  • 7. The greenphase
  • 8. The refactoringphase
  • 9. Once finished you pick up auser story and start againwriting a new failing test
  • 10. Refactoring example
  • 11. Summary¡  Unit testing is the cornerstone of TDD¡  TDD = Red, green, refactor¡  Red = write a failing unit test¡  Green = make the unit test pass using a naïve implementation¡  Refactor = improve the code quality¡  TDD results in huge benefits like better quality code that better matches the business requirements, encourages communication and eliminates gold plating

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