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State of Testing in otlin @inyaki_mwc

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https://pusher.com/state-of-kotlin

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https://insights.stackoverflow.com/survey/2018#most-loved-dreaded-and-wanted

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https://pusher.com/state-of-kotlin https://insights.stackoverflow.com/survey/2018#most-loved-dreaded-and-wanted

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*.dex *.class Java complier application.apk

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*.dex *.class Java complier Kotlin complier application.apk

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Kotlin JVM NATIVE JS Android Server IOS MacOs Linux Windows Web Assembly

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Kotlin

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Kotlin Nullability Language Features Sealed Classes HOF Lambdas Contracts Inlining Data Classes …

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Kotlin Nullability Language Features Sealed Classes HOF Lambdas Contracts Inlining Data Classes … Static Tools

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Kotlin Nullability Language Features Sealed Classes HOF Lambdas Contracts Inlining Data Classes … Static Tools Lint Koshry Detekt …

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Kotlin Nullability Language Features Sealed Classes HOF Lambdas Contracts Inlining Data Classes … Static Tools Lint Koshry Detekt … Testing

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sourceSets { test { java.srcDirs += "src/test/kotlin" } }

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sourceSets { test { java.srcDirs += "src/test/kotlin" } }

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@Test public void testThreeReturnsFizz() { final FizzBuzz fizzBuzz = new FizzBuzz(); assertTrue(“Fizz", fizzBuzz.get(3)); }

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@Test public void testThreeReturnsFizz() { final FizzBuzz fizzBuzz = new FizzBuzz(); assertTrue(“Fizz", fizzBuzz.get(3)); } @Test fun testThreeReturnsFizz() { val fizzBuzz = FizzBuzz() assertTrue("Fizz" == fizzBuzz.get(3)) }

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@Test public void testThreeReturnsFizz() { final FizzBuzz fizzBuzz = new FizzBuzz(); assertTrue(“Fizz", fizzBuzz.get(3)); } @Test fun testThreeReturnsFizz() { val fizzBuzz = FizzBuzz() assertTrue("Fizz" == fizzBuzz.get(3)) }

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@Test public void testThreeReturnsFizz() { final FizzBuzz fizzBuzz = new FizzBuzz(); assertTrue(“Fizz", fizzBuzz.get(3)); } @Test fun testThreeReturnsFizz() { val fizzBuzz = FizzBuzz() assertTrue("Fizz" == fizzBuzz.get(3)) }

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@Test fun testThreeReturnsFizz() { val fizzBuzz = FizzBuzz() assertTrue("Fizz" == fizzBuzz.get(3)) }

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@Test fun testThreeReturnsFizz() { val fizzBuzz = FizzBuzz() assertTrue("Fizz" == fizzBuzz.get(3)) } @Test fun `three returns Fizz`() { val fizzBuzz = FizzBuzz() assertTrue("Fizz" == fizzBuzz.get(3)) }

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@Test public void testUseCaseGetSectorPerformanceDataCallsRepository() { // Arrange when(detailsSectorRepository.getSectorPerformanceData("1")) .thenReturn(Observable.just(getMockListSectorDomain())); // Act getDaily.getSectorByType("1"); // Assert verify(detailsSectorRepository).getSectorPerformanceData("1"); }

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@Test public void testUseCaseGetSectorPerformanceDataCallsRepository() { // Arrange when(detailsSectorRepository.getSectorPerformanceData("1")) .thenReturn(Observable.just(getMockListSectorDomain())); // Act getDaily.getSectorByType("1"); // Assert verify(detailsSectorRepository).getSectorPerformanceData("1"); }

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@Test fun testUseCaseGetSectorPerformanceDataCallsRepository() { // Arrange when(detailsSectorRepository.getSectorPerformanceData("1")) .thenReturn(Observable.just(emptyList())) // Act getDaily.getSectorByType("1") // Assert verify(detailsSectorRepository).getSectorPerformanceData("1") }

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@Test fun testUseCaseGetSectorPerformanceDataCallsRepository() { // Arrange when(detailsSectorRepository.getSectorPerformanceData("1")) .thenReturn(Observable.just(emptyList())) // Act getDaily.getSectorByType("1") // Assert verify(detailsSectorRepository).getSectorPerformanceData("1") }

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@Test fun testUseCaseGetSectorPerformanceDataCallsRepository() { // Arrange when(detailsSectorRepository.getSectorPerformanceData("1")) .thenReturn(Observable.just(emptyList())) // Act getDaily.getSectorByType("1") // Assert verify(detailsSectorRepository).getSectorPerformanceData("1") }

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@Test fun testUseCaseGetSectorPerformanceDataCallsRepository() { // Arrange `when`(detailsSectorRepository.getSectorPerformanceData("1")) .thenReturn(Observable.just(emptyList())) // Act getDaily.getSectorByType("1") // Assert verify(detailsSectorRepository).getSectorPerformanceData("1") } import org.mockito.Mockito.`when`

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https://github.com/nhaarman/mockito-kotlin

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https://github.com/nhaarman/mockito-kotlin @Test fun testUseCaseGetSectorPerformanceDataCallsRepository() { // Arrange whenever(detailsSectorRepository.getSectorPerformanceData("1")) .thenReturn(Observable.just(emptyList())) // Act getDaily.getSectorByType("1") // Assert verify(detailsSectorRepository).getSectorPerformanceData("1") }

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https://github.com/nhaarman/mockito-kotlin @Test fun testUseCaseGetSectorPerformanceDataCallsRepository() { // Arrange whenever(detailsSectorRepository.getSectorPerformanceData("1")) .thenReturn(Observable.just(emptyList())) // Act getDaily.getSectorByType("1") // Assert verify(detailsSectorRepository).getSectorPerformanceData("1") }

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val db = mock { on { getDetailsBySector(anyString()) } doReturn (Observable.just(getMockListSectorDb())) }

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val db = mock { on { getDetailsBySector(anyString()) } doReturn (Observable.just(getMockListSectorDb())) }

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val db = mock { on { getDetailsBySector(anyString()) } doReturn (Observable.just(getMockListSectorDb())) } fun on(methodCall: T.() -> R): OngoingStubbing { return try { Mockito.`when`(mock.methodCall()) } catch (e: NullPointerException) { throw MockitoKotlinException( "", e ) } }

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@Query("SELECT * FROM DetailSectorDb WHERE description= :description") suspend fun getDetailsBySector(description: String): List

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@Query("SELECT * FROM DetailSectorDb WHERE description= :description") suspend fun getDetailsBySector(description: String): List

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@Query("SELECT * FROM DetailSectorDb WHERE description= :description") suspend fun getDetailsBySector(description: String): List val db = mock { onBlocking { getDetailsBySector(anyString()) } doReturn getMockListSectorDb() }

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@Query("SELECT * FROM DetailSectorDb WHERE description= :description") suspend fun getDetailsBySector(description: String): List val db = mock { onBlocking { getDetailsBySector(anyString()) } doReturn getMockListSectorDb() }

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@Query("SELECT * FROM DetailSectorDb WHERE description= :description") suspend fun getDetailsBySector(description: String): List val db = mock { onBlocking { getDetailsBySector(anyString()) } doReturn getMockListSectorDb() } fun KStubbing.onBlocking( m: suspend T.() -> R ): OngoingStubbing { return runBlocking { Mockito.`when`(mock.m()) } }

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@Query("SELECT * FROM DetailSectorDb WHERE description= :description") suspend fun getDetailsBySector(description: String): List val db = mock { onBlocking { getDetailsBySector(anyString()) } doReturn getMockListSectorDb() } fun KStubbing.onBlocking( m: suspend T.() -> R ): OngoingStubbing { return runBlocking { Mockito.`when`(mock.m()) } }

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https://github.com/kotlintest/kotlintest

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https://github.com/kotlintest/kotlintest

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https://github.com/kotlintest/kotlintest Testing Styles Matchers/Assertions Inspectors Property Testing

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https://github.com/kotlintest/kotlintest Testing Styles Matchers/Assertions Inspectors Property Testing

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https://github.com/kotlintest/kotlintest String Spec Fun Spec Should Spec Word Spec Feature Spec Behavior Spec Free Spec Testing Styles Matchers/Assertions Inspectors Property Testing

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https://github.com/kotlintest/kotlintest String Spec Fun Spec Should Spec Word Spec Feature Spec Behavior Spec Free Spec Testing Styles Matchers/Assertions Inspectors Property Testing class MyTests : StringSpec({ "strings.length should return size of string" { "hello".length shouldBe 5 } })

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https://github.com/kotlintest/kotlintest String Spec Fun Spec Should Spec Word Spec Feature Spec Behavior Spec Free Spec Testing Styles Matchers/Assertions Inspectors Property Testing class GetPairsImplTest : BehaviorSpec({ given("GetPairs Implementation") { `when`("There are no Pairs ") { val pairRepository = mock { } val getPairs = GetPairsImpl(pairRepository) whenever(pairRepository.getPairs()).thenReturn(emptyList()) getPairs.get() then("I should sync Pairs") { verify(pairRepository).syncPairs() } } } })

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https://github.com/kotlintest/kotlintest Testing Styles Matchers/Assertions Inspectors Property Testing

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https://github.com/kotlintest/kotlintest Testing Styles Matchers/Assertions Inspectors Property Testing

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https://github.com/kotlintest/kotlintest Testing Styles Matchers/Assertions Inspectors Property Testing General Collections Types Files Threads Dates

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https://github.com/kotlintest/kotlintest Testing Styles Matchers/Assertions Inspectors Property Testing General Collections Types Files Threads Dates clientIsConnected.shouldBeTrue() status.shouldBe("connected")

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https://github.com/kotlintest/kotlintest Testing Styles Matchers/Assertions Inspectors Property Testing General Collections Types Files Threads Dates clientIsConnected.shouldBeTrue() status.shouldBe("connected") clientIsConnected shouldBe true status shouldBe("connected")

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https://github.com/kotlintest/kotlintest Testing Styles Matchers/Assertions Inspectors Property Testing https://arrow-kt.io/

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https://github.com/kotlintest/kotlintest Testing Styles Matchers/Assertions Inspectors Property Testing https://arrow-kt.io/

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https://github.com/kotlintest/kotlintest Testing Styles Matchers/Assertions Inspectors Property Testing

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https://github.com/kotlintest/kotlintest Testing Styles Matchers/Assertions Inspectors Property Testing

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https://github.com/kotlintest/kotlintest Testing Styles Matchers/Assertions Inspectors Property Testing class TestInspectors : StringSpec({ "All the elements in the list formatted" { val xs = listOf("aa_1", "aa_2", "aa_3") xs.forAll { it.shouldContain("_") it.shouldStartWith("aa") } } })

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https://github.com/kotlintest/kotlintest Testing Styles Matchers/Assertions Inspectors Property Testing class TestInspectors : StringSpec({ "All the elements in the list formatted" { val xs = listOf("aa_1", "aa_2", "aa_3") xs.forAll { it.shouldContain("_") it.shouldStartWith("aa") } } })

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https://github.com/kotlintest/kotlintest Testing Styles Matchers/Assertions Inspectors Property Testing class TestInspectors : StringSpec({ "All the elements in the list formatted" { val xs = listOf("aa_1", "aa_2", "aa_3") xs.forAll { it.shouldContain("_") it.shouldStartWith("aa") } } }) forAll forNone forAtMostOne forAtLeastOne forAny

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https://github.com/kotlintest/kotlintest Testing Styles Matchers/Assertions Inspectors Property Testing

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https://github.com/kotlintest/kotlintest Testing Styles Matchers/Assertions Inspectors Property Testing "String size" { assertAll { a: String, b: String -> (a + b).length shouldBe a.length + b.length } }

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https://github.com/kotlintest/kotlintest testImplementation("io.kotlintest:kotlintest-runner-junit5:3.3.0")

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https://github.com/kotlintest/kotlintest val test by tasks.getting(Test::class) { useJUnitPlatform { } } testImplementation("io.kotlintest:kotlintest-runner-junit5:3.3.0")

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description.should(endWith(value))

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description.should(endWith(value)) description should endWith(value)

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description.should(endWith(value)) description should endWith(value) infix fun T.should(matcher: Matcher)

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description.should(endWith(value)) description should endWith(value) infix fun T.should(matcher: Matcher)

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description.should(endWith(value)) description should endWith(value) infix fun T.should(matcher: Matcher)

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description.should(endWith(value)) description should endWith(value) infix fun T.should(matcher: Matcher)

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DEMO

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I am your Father Luke DEMO

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onView(withId(R.id.overview_sectors_list)) .perform(click()) .check(matches(isDisplayed()))

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val description: KTextView = KTextView { withId(R.id.text_view_small) } val title: KTextView = KTextView { withId(R.id.text_view_large) }

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val description: KTextView = KTextView { withId(R.id.text_view_small) } val title: KTextView = KTextView { withId(R.id.text_view_large) } @Test fun testContentScreen() { screen { content { isVisible() } description { click() isVisible() hasAnyText() } title { isVisible() hasAnyText() } } }

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val description: KTextView = KTextView { withId(R.id.text_view_small) } val title: KTextView = KTextView { withId(R.id.text_view_large) } @Test fun testContentScreen() { screen { content { isVisible() } description { click() isVisible() hasAnyText() } title { isVisible() hasAnyText() } } }

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val description: KTextView = KTextView { withId(R.id.text_view_small) }

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val description: KTextView = KTextView { withId(R.id.text_view_small) } class KTextView : KBaseView, TextViewAssertions { constructor(function: ViewBuilder.() -> Unit) : super(function) constructor(parent: Matcher, function: ViewBuilder.() -> Unit) : super(parent, function) }

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val description: KTextView = KTextView { withId(R.id.text_view_small) } class KTextView : KBaseView, TextViewAssertions { constructor(function: ViewBuilder.() -> Unit) : super(function) constructor(parent: Matcher, function: ViewBuilder.() -> Unit) : super(parent, function) }

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val description: KTextView = KTextView { withId(R.id.text_view_small) } class KTextView : KBaseView, TextViewAssertions { constructor(function: ViewBuilder.() -> Unit) : super(function) constructor(parent: Matcher, function: ViewBuilder.() -> Unit) : super(parent, function) } constructor(function: ViewBuilder.() -> Unit) { view = ViewBuilder().apply(function).getViewInteraction() }

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Spek MockK https://mockk.io/ Kluent https://markusamshove.github.io/Kluent/ https://spekframework.org/ https://www.kotlinresources.com/library/assertk/ AssertK

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Strategies Testing Kotlin Mockito Kotlin Kotlin Test Kakao https://github.com/nhaarman/mockito-kotlin https://github.com/kotlintest/kotlintest https://github.com/agoda-com/Kakao

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@inyaki_mwc Thanks