The Art of Unit Testing

Transcript

1. The Art of Unit Testing
   Jessica Cecilia Budianto | Software Engineer - Web Platform
   

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2. Agenda
   ● Definition
   ● Principles
   ● Structure
   ● Preferences
   ● Practice
   

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3. Definition
   

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4. The benefits
   ● Helps to detect potential bug in code
   ● Reflects current code quality
   ● Made sure the code still works properly after refactor / major changes
   ● Documents the features and user flows of our code
   ● Trains our mindset to be a better software developer
   ○ How user interacts with our code
   ○ How edge cases and error might arise from our logic
   ○ Improves attention to detail
   

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5. Principles
   

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6. Fast
   It shouldn’t take long 🤔
   

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7. Isolated / Independent
   Not depending on other test cases
   

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8. Repeatable
   Not relying on e.g: network
   connection
   

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9. Self Validating
   A test should immediately
   acknowledges whether it succeeds
   

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10. Timely
    A test should be able to be written
    before development even started
    

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11. Understandable
    A test should be like telling a story
    

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12. Stucture
    

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13. General Test Structure
    

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14. Preferences
    

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15. Top down vs Bottom up
    

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16. https://kentcdodds.com/blog/write-tests
    

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17. Test Driven Development (TDD)
    

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18. But the downsides…
    ● Too focused on testing and making it passed
    ● Time consuming
    ● Harder for big codebase
    ● Even harder if it’s legacy code
    ● Might write a wrong test or miss the edge cases instead
    

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19. Behavior Driven Development (BDD)
    

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20. Practice
    

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21. Github:
    https://github.com/jessicacb12/
    basic-calculator
    Vercel:
    https://basic-calculator-psi.vercel.app/
    

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28. Unit Testing will not just affect your code
    quality, but also your collaboration with
    stakeholders
    

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