Testing Express: 0 to 100 in 30 slides

Transcript

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

2. Self-promotion Q&A => http:/ /goo.gl/slides/x4c4xw

3. Why this talk? • We <3 our customers • Confidence

   • Safety Net • Refactoring, refactoring, refactoring • It is professional, guys :) Q&A => http:/ /goo.gl/slides/x4c4xw

4. By Mike Cohn Q&A => http:/ /goo.gl/slides/x4c4xw

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 Q&A => http:/ /goo.gl/slides/x4c4xw

6. JVM No need external env set up Tests run in

   build time Use test doubles Slower tests than unit tests Q&A => http:/ /goo.gl/slides/x4c4xw

7. JVM Application classes in isolation Test doubles Build time Really

   fast tests F.I.R.S.T. Q&A => http:/ /goo.gl/slides/x4c4xw

8. What’s wrong with this?

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 Q&A => http:/ /goo.gl/slides/x4c4xw

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 Q&A => http:/ /goo.gl/slides/x4c4xw

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

12. Talk is cheap. Show me the code.

13. Q&A => http:/ /goo.gl/slides/x4c4xw

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15. Q&A => http:/ /goo.gl/slides/x4c4xw

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17. Code readability + Naming + Code structure + DSL

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19. Q&A => http:/ /goo.gl/slides/x4c4xw

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21. • Builders

22. Builders + Mothers

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26. Q&A => http:/ /goo.gl/slides/x4c4xw

27. Q&A kini@tuenti.com @kinisoftware http:/ /goo.gl/slides/x4c4xw

28. Thanks!! We are hiring! kini@tuenti.com @kinisoftware

29. Extra Ball • Mix JVM Languages (Groovy, Scala, Kotlin, etc)

    • Java 8 fuck yeah! • JUnit 5 • Mutation Testing

30. Extra Ball • Effective Unit Testing • WEWUT • Pragmatic

    Unit Testing with JUnit • GOOS • The Art of Unit Testing • JUnit in Action • xUnit Patterns • Refactoring