Test Driven Development

Intro to Testing, TDD, with many GIFs sprinkled in. Given at http://boston.io on 2/4/2012, UBHacking on 3/24/2012, and at RIT's ViSE program on 4/13/2012.

Transcript

1. TEST
   DRIVEN
   DEVELOPMENT
   

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2. i’m @qrush
   

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3. @
   i live here
   

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4. c
   i work at 37signals
   

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5. TESTING!
   

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6. 2/4/12
   

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7. 4/13/12
   

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8. test-driven!
   

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9. what
   is
   testing?
   

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10. REFRESHING
    COMPILING
    FOR SOMEONE
    ELSE TO DO
    not:
    

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11. TESTING
    DEFINES HOW
    YOUR CODE
    WORKS
    

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12. why should
    i test?
    

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13. PREDICTABILITY
    

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14. TIGHTER
    FEEDBACK
    LOOPS
    

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15. DEPENDABILITY
    

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16. LOOSE COUPLING
    

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17. how do
    you test
    something?
    

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18. PICK ANY
    LANGUAGE
    

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19. PICK ANY
    FRAMEWORK
    

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20. SAME
    STEPS
    SAME
    PATTERNS
    

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21. 4 PHASE
    TEST
    

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22. setup
    exercise
    verification
    teardown
    

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23. what is
    TDD?
    

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24. WRITE TESTS
    FIRST
    

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25. WRITE NEW
    CODE ONLY
    ON TEST
    FAILURE
    

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26. write a test
    watch it fail
    make it pass
    repeat
    

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27. RHYTHM
    

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28. red
    green
    refactor
    

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30. does this
    take longer?
    

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31. YES
    

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32. INITIALLY,
    BUT IT
    CAUSES
    LESS BUGS*
    * http://bit.ly/nugeo
    

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33. does this
    suck
    sometimes?
    

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34. YES
    

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35. BUT IT
    PROVIDES
    CONFIDENCE
    

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36. is it ok
    not to test?
    

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37. YES
    

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38. JUST
    SPIKE
    IT
    

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39. BUT
    THROW
    IT AWAY
    

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40. finally,
    

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41. FIND A
    JOB*
    THAT HELPS
    YOU TEST
    

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42. ASK
    ABOUT
    POLICIES ON
    TESTING
    

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43. GO
    TEST
    YOUR CODE!
    

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