Testing Express: 0 to 100 in 30 slides

Transcript

1. Testing Express: 0 to 100 in 30 slides
   kini@tuenti.com
   @kinisoftware
   

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2. Self-promotion
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3. Why this talk?
   • We <3 our customers
   • Confidence
   • Safety Net
   • Refactoring, refactoring, refactoring
   • It is professional, guys :)
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4. By
   Mike Cohn
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5. Black-box oriented tests
   End to end
   Phone/simulator
   No tests doubles can be used
   Needs a full & provisionable server
   environment
   Slow tests
   Page Objects
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6. JVM
   No need external env set up
   Tests run in build time
   Use test doubles
   Slower tests than unit tests
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7. JVM
   Application classes in isolation
   Test doubles
   Build time
   Really fast tests
   F.I.R.S.T.
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8. What’s wrong with this?
   

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9. Testability
   • Mixing object graph construction with application logic
   • Ask for things, don’t look for things
   • Doing work in constructor
   • Global State/Singletons
   • Static methods
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10. Test Doubles
    • Stubs => Canned answers
    • Mocks => Stubs + verify
    • Spies => Record interaction info
    • Fake => I seem real but not
    • Dummy => I do nothing at all
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11. “It’s overwhelmingly easy to write bad unit tests that add
    very little value to a project while inflating the cost of
    code changes astronomically.”
    • Code coverage != Test quality
    • Don’t Repeat Yourself (Globally)
    • Mocks, mocks everywhere
    • Test smells
    

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12. Talk is cheap.
    Show me the code.
    

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13. Q&A => http:/
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15. Q&A => http:/
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17. Code readability + Naming + Code
    structure + DSL
    

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19. Q&A => http:/
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21. • Builders
    

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22. Builders + Mothers
    

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26. Q&A => http:/
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27. Q&A
    kini@tuenti.com
    @kinisoftware
    http:/
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28. Thanks!!
    We are hiring!
    kini@tuenti.com
    @kinisoftware
    

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29. Extra Ball
    • Mix JVM Languages (Groovy, Scala, Kotlin, etc)
    • Java 8 fuck yeah!
    • JUnit 5
    • Mutation Testing
    

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30. Extra Ball
    • Effective Unit Testing
    • WEWUT
    • Pragmatic Unit Testing with JUnit
    • GOOS
    • The Art of Unit Testing
    • JUnit in Action
    • xUnit Patterns
    • Refactoring
    

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