Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Testing & RxJava2 (AppBuilders 2018)
Search
Sasa Sekulic
April 16, 2018
Programming
3
420
Testing & RxJava2 (AppBuilders 2018)
With RxJava you can write some complex, multithreaded code - and testing it is easy!
Sasa Sekulic
April 16, 2018
Tweet
Share
More Decks by Sasa Sekulic
See All by Sasa Sekulic
Testing & RxJava2 (GrowIT Serbia 2018)
mrsasha
0
62
Management for developers v.2
mrsasha
0
49
Management for developers
mrsasha
1
180
Reactive programming on Android - why and how v2 (CodeMobile 2017)
mrsasha
0
88
Reactive programming on Android - why and how (Droidcon Krakow 2016)
mrsasha
0
250
Reactive programming on Android - why and how (Droidcon UK 2016)
mrsasha
6
520
Recipes in RxJava for Android, v.3
mrsasha
1
250
Recipes in RxJava for Android, v.2
mrsasha
3
1.3k
Recipes in RxJava for Android
mrsasha
7
1.6k
Other Decks in Programming
See All in Programming
家族・子育て重視/沖縄在住を維持しながらエンジニアとしてのキャリアをどのように育てていくか?
ug
0
260
The Weight of Data: Rethinking Cloud-Native Systems for the Age of AI
hollycummins
0
250
Denoでフロントエンド開発 2025年春版 / Frontend Development with Deno (Spring 2025)
petamoriken
1
1.3k
custom_lintで始めるチームルール管理
akaboshinit
0
200
エンジニア未経験が最短で戦力になるためのTips
gokana
0
250
Building Scalable Mobile Projects: Fast Builds, High Reusability and Clear Ownership
cyrilmottier
2
210
AIコードエディタの基盤となるLLMのFlutter性能評価
alquist4121
0
190
Kubernetesで実現できるPlatform Engineering の現在地
nwiizo
3
1.8k
PsySHから紐解くREPLの仕組み
muno92
PRO
1
540
snacks.nvim内のセットアップ不要なプラグインを紹介 / introduce_snacks_nvim
uhooi
0
380
これだけは知っておきたいクラス設計の基礎知識 version 2
masuda220
PRO
23
5.4k
いまさら聞けない生成AI入門: 「生成AIを高速キャッチアップ」
soh9834
15
4.3k
Featured
See All Featured
It's Worth the Effort
3n
184
28k
Automating Front-end Workflow
addyosmani
1369
200k
Rebuilding a faster, lazier Slack
samanthasiow
80
8.9k
The Power of CSS Pseudo Elements
geoffreycrofte
75
5.7k
Code Review Best Practice
trishagee
67
18k
Practical Orchestrator
shlominoach
186
10k
Cheating the UX When There Is Nothing More to Optimize - PixelPioneers
stephaniewalter
280
13k
Building Applications with DynamoDB
mza
94
6.3k
YesSQL, Process and Tooling at Scale
rocio
172
14k
Refactoring Trust on Your Teams (GOTO; Chicago 2020)
rmw
34
2.9k
Put a Button on it: Removing Barriers to Going Fast.
kastner
60
3.8k
Typedesign – Prime Four
hannesfritz
41
2.6k
Transcript
None
None
test() Observable.just(1) .test() .assertValue(1) val subject = PublishSubject.create<Int>()
val subject = PublishSubject.create<Int>() subject.onNext(1) subject.test() .assertValueCount(1) .assertValue(1)
TestObserver val testObserver = Observable.just(1).test() testObserver.assertValue(1) val subject
= PublishSubject.create<Int>() val testObserver = subject.test() val testObserver = subject.test() subject.onNext(1) testObserver.assertValueCount(1) testObserver.assertValue(1) subject.onNext(2) testObserver.assertValueCount(2) testObserver.assertValues(1, 2)
Observable.just(1) .test() .assertValueCount(1) .assertValue(1) .assertValue({ it == 1 }) .assertNoValues()
.assertValuesOnly(1) Observable.just(1, 2) .test() .assertValueCount(2) .assertValues(1, 2) .assertValueAt(0, 1) .assertValueAt(0) { it == 1 } .assertNever(3)
Observable.just(1) .test() .assertTerminated() .assertComplete() .assertNoErrors() .assertSubscribed() .assertNotComplete() .assertNotTerminated() .assertNotTerminated() .assertEmpty()
.assertError(PaymentException("test")) .assertError(PaymentMethodNotSupportedException::class.java) .assertError({error -> error.cause == PaymentException("test")}) .assertErrorMessage("test")
assertResult() assertSubscribed().assertValues() .assertNoErrors().assertComplete() Observable.just(1, 2).test() .assertResult(1, 2) assertFailure()
assertSubscribed().assertValues() .assertError().assertNotComplete() Observable.error<Int>(RuntimeException("test")).test() .assertFailure(RuntimeException::class.java) .assertFailure(Predicate { it -> it == RuntimeException() }) .assertFailureAndMessage(RuntimeException::class.java, "test")
assertFailure() Observable.error<Int>(RuntimeException("test")) .startWith(Observable.just(1, 2)) .test() .assertFailure(RuntimeException::class.java, 1, 2) .assertFailure(RuntimeException::class.java)
.assertFailure(Predicate { it -> it == RuntimeException() }) .assertFailureAndMessage(RuntimeException::class.java, "test")
val zippedObservable1 = Observable.error<Int>(Throwable("error 1")) val zippedObservable2 = Observable.error<Int>(Throwable("error 2"))
Observable.zip(zippedObservable1, zippedObservable2, BiFunction({first: Observable.zip(zippedObservable1, zippedObservable2, BiFunction({first: Int, second: Int -> first + second})) .test() .assertErrorMessage("error 1") .assertErrorMessage("error 2")
Observable.just(1).test() .await() .await(1, TimeUnit.SECONDS) Observable.just(1).test() .awaitTerminalEvent() Observable.just(1, 2) Observable.just(1, 2)
.delay (2, TimeUnit.SECONDS) .test() .awaitDone(2, TimeUnit.SECONDS) .awaitCount(2, BaseTestConsumer.TestWaitStrategy.SLEEP_1000MS, 2000) .assertTimeout()
Schedulers Observable.just(1) .observeOn(Schedulers.io()) .test() .assertValue(1) Schedulers Schedulers
Schedulers
Schedulers RxJavaPlugins.setIoSchedulerHandler { Schedulers.trampoline() } Observable.just(1) .observeOn(Schedulers.io()) .test() .assertValue(1) Schedulers
Schedulers RxJavaPlugins.setIoSchedulerHandler { Schedulers.trampoline() } RxJavaPlugins.setComputationSchedulerHandler { Schedulers.trampoline() } RxJavaPlugins.setNewThreadSchedulerHandler { Schedulers.trampoline() } Schedulers RxAndroidPlugins.reset() RxAndroidPlugins.setInitMainThreadSchedulerHandler {Schedulers.trampoline()}
Schedulers @Rule class TrampolineSchedulerRule : TestRule { override fun apply(base:
Statement, d: Description): Statement { return object : Statement() { @Throws(Throwable::class) override fun evaluate() { RxJavaPlugins.setIoSchedulerHandler… try { base.evaluate() } finally { RxJavaPlugins.reset() } } } } }
Schedulers @Rule @Rule val schedulerRule = TrampolineSchedulerRule() https://medium.com/@fabioCollini/testing-asynchronous-rxjava-code-using-mockito-
8ad831a16877 https://www.infoq.com/articles/Testing-RxJava
Schedulers Schedulers interface SchedulerProvider { fun ui(): Scheduler fun computation():
Scheduler fun io(): Scheduler } class AppSchedulerProvider : SchedulerProvider { override fun ui() = AndroidSchedulers.mainThread() override fun computation() = Schedulers.computation() override fun io() = Schedulers.io() } class TrampolineSchedulerProvider : SchedulerProvider { override fun ui() = Schedulers.trampoline() override fun computation() = Schedulers.trampoline() override fun io() = Schedulers.trampoline() }
Schedulers class UsesSchedulerProvider (schedulers: SchedulerProvider) { … … }
fun methodWithWorker(scheduler: Scheduler): AtomicInteger { val counter = AtomicInteger() val
worker = scheduler.createWorker() worker.schedule({ counter.incrementAndGet() }) worker.schedule({ counter.incrementAndGet() }) return counter } val scheduler = TestScheduler() val counter = methodWithWorker(scheduler) Assert.assertEquals(2, counter.get()) testScheduler.triggerActions() Assert.assertEquals(2, counter.get())
TestScheduler val timedoutObservable = Observable.never<Int>() .timeout(5, TimeUnit.SECONDS) timedoutObservable.test() .assertError(TimeoutException::class.java) timeout()
timeout(5, TimeUnit.SECONDS) == timeout(5, TimeUnit.SECONDS, Schedulers.computation())
TestScheduler val scheduler = TestScheduler() val timedoutObservable = Observable.never<Int>() val
timedoutObservable = Observable.never<Int>() .timeout(5, TimeUnit.SECONDS, ,scheduler) advanceTimeBy() scheduler.advanceTimeBy(5, TimeUnit.SECONDS) timedoutObservable.test() .assertError(TimeoutException::class.java)
TestScheduler TestScheduler val scheduler = TestScheduler(2, TimeUnit.SECONDS) advanceTimeTo() Scheduler.advanceTimeTo(5, TimeUnit.SECONDS)
TestScheduler TestScheduler val currentTime = scheduler.now(TimeUnit.SECONDS)