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Writing testable code

Rodrigo Boniatti
November 30, 2019
Programming
0
43

Writing testable code

Rodrigo Boniatti

November 30, 2019
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Transcript

  1. Writing testable code

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  2. Rodrigo Boniatti
    Developer at Codeminer 42

    @boniattirodrigo

    rodrigoboniatti.com

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  3. Conditionals

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  4. View Slide

  5. Smell

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  6. View Slide

  7. View Slide

  8. Refactored

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  9. View Slide

  10. View Slide

  11. Conditionals
    • Smell:
    • High cyclomatic complexity score;

    • How to solve?
    • Replace Conditional with Polymorphism;

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  12. Global state

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  13. Smell

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  14. View Slide

  15. Refactored

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  16. View Slide

  17. Global state
    • Smell:
    • Coupling;

    • How to solve?
    • Dependency injection;

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  18. Life cycle events

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  19. Smell

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  20. View Slide

  21. Refactored

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  22. View Slide

  23. Life cycle events
    • Smell:
    • Hide code behavior;

    • No execution order;

    • How to solve?
    • Single flow;

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  24. Principles of testing

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  25. Principles of testing
    • Test in isolation;

    • A lot of setup == smell;

    • Hard to test == smell;

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  26. Questions?

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  27. Thank you
    Code examples: https://github.com/boniattirodrigo/writing-testable-code

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