Testing UIViewControllers

Slides from lightning talk given 10/22 @ Swift Language User Group

Transcript

1. Testing UIViewControllers Rachel Bobbins
2. Motivation Why do I care? Why should you care?
3. Motivation Why do I care? Why should you care? The UIViewController controls the user’s experience.
4. Motivation Why do I care? Why should you care? The UIViewController controls the user’s experience. It should be a good one.
5. Motivation Why do I care? Why should you care? The UIViewController controls the user’s experience. It should be a good one. (Don’t you think so?)
6. But wait... • I don’t need view controller tests–I have UI tests!
7. Demo App
8. A quick note about testing tools
9. 2 Principles
10. Principle 1: Test the interface.
11. Example: Button tap https://youtu.be/2w7j--b9-Xo
12. Example: Button tap
13. Example: Button tap Tip #1: Names that describe behavior, not methods
14. Example: Button tap Tip #2: Write a “tap” helper. Then, you can just do “button.tap()”
15. Principle 2: Inject all the dependencies
16. Why? This line of code Should pass this test…
17. Why? This line of code Should pass this test…
18. Why? This line of code Should pass this test… Ohh UIKit.
19. Example Dependency: Dialog Presenter!!! Tip #3: Use protocols.
20. Example Dependency: Dialog Presenter!!! Tip #3: Use protocols.
21. Example Dependency: Dialog Presenter!!! Tip #3: Use protocols. If a view controller needs it, it needs conform to a protocol
22. Example Dependency: Dialog Presenter!!!
23. Example Dependency: Dialog Presenter!!!
24. Example Dependency: Dialog Presenter!!! Tip #4: Invest in fakes.
25. Example Dependency: Dialog Presenter!!! Tip #4: Invest in fakes.
26. Example Dependency: Dialog Presenter!!! Tip #4: Invest in fakes. Boolean properties keep track of which methods were called
27. Example Dependency: Dialog Presenter!!! Tip #4: Invest in fakes. Boolean properties keep track of which methods were called Tuple properties keep track of the arguments
28. Example Dependency: Dialog Presenter!!! Write tests that read like English sentences
29. FYI + Resources - Demo code is on GitHub: https://github. com/rbobbins/earthquake-counter - PivotalCoreKit has useful helpers for simulating interactions (i.e - tap) https://github. com/pivotal/PivotalCoreKit/tree/master/UIKit/SpecHelper/E xtensions