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
15. Q&A => http:/ /goo.gl/slides/x4c4xw
17. Code readability + Naming + Code structure + DSL
19. Q&A => http:/ /goo.gl/slides/x4c4xw
21. • Builders
22. Builders + Mothers
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