Spaceship TDD Style
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Slides of the lab we ran at Reversim summit 2013, building a spaceship in TDD
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Spaceship TDD Style
- 1. @gil_zilberfeld Spaceship TDD Style Gil Zilberfeld
- 2. @gil_zilberfeld Who Am I Agile helper Software improver Author of “Everyday Unit Testing” www.gilzilberfeld.com www.everydayunittesting.com @gil_zilberfeld
- 5. @gil_zilberfeld Rules of Engagement • We’re building parts of a spaceship • Gotta have a test framework • Break into pairs • Introduce yourself - 5 minutes • Try to stick to technology you feel comfortable in • Work in rounds • 15 minute work • 10 public review
- 6. @gil_zilberfeld The Fantastic Four • Navigation • Weapons and Shields • Engine • Environment Not the whole ship!
- 7. @gil_zilberfeld Round 1: Silence of the Names • Write empty tests • Write as many test cases as possible using names • All tests should pass • No speaking
- 8. @gil_zilberfeld Review - Names • How do you feel about the names? Did it change over time? • Did both of you suggest names? • Are the names clear? • Did the tests pass? • How did the name ideation go? • How did the first test set the stage?
- 9. @gil_zilberfeld Round 2: Test Runner • 1st person selects, writes and fails a test • 2nd person makes it pass • No refactoring • All tests must pass
- 10. @gil_zilberfeld Review – Test First, Pass Second • How many tests passed? • Which tests did you start with? • Who’s holding up the line? What did you feel about this? • What is the quality of the code? • What is the quality of the test? • Do the names describe the tests correctly? • How much conversation time?
- 11. @gil_zilberfeld Round 3 - Transformers • Refactor code and tests • Save the old version • No adding and removing tests • All tests must pass
- 12. @gil_zilberfeld Review - Refactoring • What did you decide to refactor? • Who led the process? • Did everyone agree on the changes? • What did you refactor more, code or tests? • Did you run the tests after every change? • Did you do enough refactoring? • How long between test runs?
- 13. @gil_zilberfeld Round 4 –Predator Vs Alien • Break up the pairs • 3 minute introduction • The Predators write the tests • No talking to the aliens • Add more tests if needed • Step away when a test fails • The Aliens write the passing code • No talking to predators • Observe already working tests and code • Step away when a test passes • All tests must pass • Get points for passing additional tests
- 14. @gil_zilberfeld Review – Facing the unknown • Predators: • What was the quality of tests compared to the ones you wrote before? • Why did you pick those test cases? • How did you work together? • Aliens: • What did you think about the tests picked by the predators? • Was the existing code helpful? • How did you work together?
- 15. @gil_zilberfeld The many faces of TDD • TDD is not just Red-Green-Refactor • Can be done in different ways • It is a learning experience • More fun in groups / pairs
- 16. @gil_zilberfeld What did you learn? • New • Surprising • Disappointing
- 17. @gil_zilberfeld Thank You! • Questions? • Contact me: • @gil_zilberfeld • http://www.gilzilberfeld.com • http://www.everydayunittesting.com