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Best practices for unit testing RxJava
- 1. Best practices forunit testing RxJava Simon Perčič, senior Android developer Tuesday, November 8th, 2016 @ 18:00
- 2. RxJava? ● Useful forcombining, transforming, manipulating streams of data ● How to unit test?
- 3. What to unittest? ● Observables - composition of operators ● Code that uses Rx (e.g. presenters)
- 4. Let’s set anexample
- 5. What will wetest?
- 6. What will wetest? DataManager methods:
- 7.
- 8. Tip #1 Separate dataproviders
- 9. Test skeleton 1/3 mocked subjectof testing
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- 12. Test examples* * notbest practices
- 13. Wrong test #1 Works. →But only if getPlanets() is run on the immediate thread
- 14. Wrong test #1 Works. →But only if getPlanets() is run on the immediate thread
- 15. Not immediate thread Runson another thread!
- 16. Wrong test #1- on another thread Fails. → getPlanets() switches thread, Assert happens “too soon”
- 17. Wrong test #2- blocking Works. → it waits for the getPlanets() single to complete.
- 18. Wrong test #2- countdown Blocks here
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- 20. Tip #2 Single /Observable transformer Network thread
- 21. Tip #2 -in manager Compose with scheduler transformer
- 22. Tip #2 -in test No op transformation.
- 23. Tip #3 (thebig one)* * best practices
- 24. Built-in classes ● TestSubscriber ●TestScheduler ● TestSubject
- 25. Tip #3 [1/3]- TestSubscriber ● Subscriber with additional test methods ● Part of RxJava
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- 27. ● Blocking ○ awaitTerminalEvent() TestSubscribermethods Will block
- 28. ● Assertions ○ Completion ■assertCompleted() / assertNotCompleted() ■ assertTerminalEvent() / assertNoTerminalEvent() TestSubscriber methods
- 29. ● Assertions ○ Errors ■assertNoErrors() ■ assertError(Class / Throwable) TestSubscriber methods
- 30. ● Assertions ○ Values ■assertNoValues() ■ assertValueCount(int) ■ assertValue(T) / assertValues(T…) TestSubscriber methods
- 31. ● Get values ○Values ■ List<T> getOnNextEvents() ○ Errors ■ List<Throwable> getOnErrorEvents() TestSubscriber methods
- 32. Tip #3 [2/3]- TestScheduler
- 33. ● Time “manipulation” ○Advance time ■ advanceTimeBy(long, TimeUnit) ■ advanceTimeTo (long, TimeUnit) ○ Force trigger ■ triggerActions() TestScheduler methods
- 34. Tip #3 [3/3]- TestSubject ● Enables us to queue events with a delay ○ onNext(T, delayMs) ○ onCompleted(delayMs) ○ onError(Throwable, delayMs)
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- 37. ● Use RxJava ●Make your code unit-testable ● Be aware of threading ● Use built-in testing utils Recap
- 38.