Mocking Kotlin with MockK

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KOTLIN'DE MOCKLAMA VE MOCKK

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BEN KIMIM ➤ Lead Android Dev @CizitzenMe ➤ https://haditok.com

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UNIT TESTING NEDIR? ➤ Unit: En küçük test edilebilir birim (Class, Function) ➤ Birimler diğer birimlerden bağımısız olarak test edilir. ➤ Diğer birimler Mock veya Fake ile değiştirilir.

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TEST EDILEBILIR KOD ➤ Separations of concerns ➤ Dependency injection ➤ Clean code

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FAKE ➤ Anlamı: Sahte ➤ Daha önceden belirlenmiş değerleri dönerek kontrollü bir ortam sağlama

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MOCKING NEDIR? Kuzey Alaycı kuşu (Mimus polyglottos)

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MOCK ➤ Anlamı: Taklit, Alay ➤ Unit testlerde test ettiğimiz birimin ihtiyacı olan objeleri objeleri taklit ederek, bu objeler üzerinde tam kontrol sağlar

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NELERI KONTROL EDIYORUZ? ➤ Değişken ve fonksiyonların döneceği değerleri ➤ Fonksiyonların doğru parametreler ile çağırılıp çağrılmadığını

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NEDEN MOCKK ➤ Saf Kotlin için bir framework ➤ Domain Speciﬁc Language(DSL)

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data class User(val userId: String, val userName: String)

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data class User(val userId: String, val userName: String) interface UserApi { fun deleteUser(userId: String): Boolean }

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data class User(val userId: String, val userName: String) interface UserApi { fun deleteUser(userId: String): Boolean } class UserManager(private val userApi: UserApi) { fun deleteUser(user: User): Boolean { return userApi.deleteUser(user.userId) } }

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@Test fun basicTest() { val userApi: UserApi = mockk() }

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@Test fun basicTest() { val userApi: UserApi = mockk() val userManager = UserManager(userApi) }

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@Test fun basicTest() { val userApi: UserApi = mockk() val userManager = UserManager(userApi) val userId = "123" val user: User = mockk() every { user.userId } returns userId }

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@Test fun basicTest() { val userApi: UserApi = mockk() val userManager = UserManager(userApi) val userId = "123" val user: User = mockk() every { user.userId } returns userId every { userApi.deleteUser(userId) } returns true val result = userManager.deleteUser(user) }

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@MockK lateinit var userApi: UserApi @MockK lateinit var user: User val userId = “123" lateinit var userManager:UserManager @Before fun initTests() { MockKAnnotations.init(this) userManager = UserManager(userApi) every { user.userId } returns userId } @Test fun basicTest() { every { userApi.deleteUser(userId) } returns true val result = userManager.deleteUser(user) assert(result).toBe(true) verify { userApi.deleteUser(userId) } }

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OBJECT MOCK

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object Calculator { fun add(first: Int, second: Int) = first + second }

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object Calculator { fun add(first: Int, second: Int) = first + second } @Test fun objectMock() { val result = Calculator.add(1, 2) assert(result).toBe(3) }

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object Calculator { fun add(first: Int, second: Int) = first + second } @Test fun objectMock() { val result = Calculator.add(1, 2) assert(result).toBe(3) mockkObject(Calculator) }

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object Calculator { fun add(first: Int, second: Int) = first + second } @Test fun objectMock() { val result = Calculator.add(1, 2) assert(result).toBe(3) mockkObject(Calculator) every { Calculator.add(1, 2) } returns 42 }

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STATIC MOCK

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public class CalculatorStatic { static int add(int first, int second){ return first+second; } }

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@Test fun staticMock() { val result = CalculatorStatic.add(1, 2) assert(result).toBe(3) }

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@Test fun staticMock() { val result = CalculatorStatic.add(1, 2) assert(result).toBe(3) mockkStatic(CalculatorStatic ::class) }

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@Test fun staticMock() { val result = CalculatorStatic.add(1, 2) assert(result).toBe(3) mockkStatic(CalculatorStatic ::class) every { CalculatorStatic.add(1, 2) } returns 42 }

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@Test fun staticMock() { val result = CalculatorStatic.add(1, 2) assert(result).toBe(3) mockkStatic(CalculatorStatic ::class) every { CalculatorStatic.add(1, 2) } returns 41 val mockedResult = CalculatorStatic.add(1, 2) }

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COROUTINES

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data class User(val userId: String, val userName: String) interface UserApi { suspend fun deleteUser(userId: String): Boolean }

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data class User(val userId: String, val userName: String) interface UserApi { suspend fun deleteUser(userId: String): Boolean } class UserManager(private val userApi: UserApi) { suspend fun deleteUser(user: User): Boolean { return userApi.deleteUser(user.userId) } }

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@Test fun basicTest() = runBlocking { }

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@Test fun basicTest() = runBlocking { val userApi: UserApi = mockk() val userManager = UserManager(userApi) val userId = "123" val user: User = mockk() every { user.userId } returns userId }

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@Test fun basicTest() = runBlocking { val userApi: UserApi = mockk() val userManager = UserManager(userApi) val userId = "123" val user: User = mockk() every { user.userId } returns userId coEvery { userApi.deleteUser(userId) } returns true }

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@Test fun basicTest() = runBlocking { val userApi: UserApi = mockk() val userManager = UserManager(userApi) val userId = “123" val user: User = mockk() every { user.userId } returns userId coEvery { userApi.deleteUser(userId) } returns true val result = userManager.deleteUser(user) }