Mocking Kotlin with MockK

Transcript

1. KOTLIN'DE MOCKLAMA VE MOCKK
2. BEN KIMIM ➤ Lead Android Dev @CizitzenMe ➤ https://haditok.com
3. 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.
4. TEST EDILEBILIR KOD ➤ Separations of concerns ➤ Dependency injection ➤ Clean code
5. FAKE ➤ Anlamı: Sahte ➤ Daha önceden belirlenmiş değerleri dönerek kontrollü bir ortam sağlama
6. MOCKING NEDIR? Kuzey Alaycı kuşu (Mimus polyglottos)
7. MOCK ➤ Anlamı: Taklit, Alay ➤ Unit testlerde test ettiğimiz birimin ihtiyacı olan objeleri objeleri taklit ederek, bu objeler üzerinde tam kontrol sağlar
8. NELERI KONTROL EDIYORUZ? ➤ Değişken ve fonksiyonların döneceği değerleri ➤ Fonksiyonların doğru parametreler ile çağırılıp çağrılmadığını
9. NEDEN MOCKK ➤ Saf Kotlin için bir framework ➤ Domain Specific Language(DSL)
10. data class User(val userId: String, val userName: String)
11. data class User(val userId: String, val userName: String) interface UserApi { fun deleteUser(userId: String): Boolean }
12. 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) } }
13. @Test fun basicTest() { val userApi: UserApi = mockk() }
14. @Test fun basicTest() { val userApi: UserApi = mockk() val userManager = UserManager(userApi) }
15. @Test fun basicTest() { val userApi: UserApi = mockk() val userManager = UserManager(userApi) val userId = "123" val user: User = mockk() every { user.userId } returns userId }
16. @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 }
17. @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) }
18. @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) assert(result).toBe(true) }
19. @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) assert(result).toBe(true) verify { userApi.deleteUser(userId) } }
20. @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) assert(result).toBe(true) verify { userApi.deleteUser(match { it.startsWith("12") }) } }
21. @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) assert(result).toBe(true) verify { userApi.deleteUser(any()) } }
22. @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) } }
23. OBJECT MOCK
24. object Calculator { fun add(first: Int, second: Int) = first + second }
25. object Calculator { fun add(first: Int, second: Int) = first + second } @Test fun objectMock() { val result = Calculator.add(1, 2) assert(result).toBe(3) }
26. 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) }
27. 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 }
28. 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 41 val mockedResult = Calculator.add(1, 2) }
29. 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 41 val mockedResult = Calculator.add(1, 2) assert(mockedResult).toBe(42) }
30. STATIC MOCK
31. public class CalculatorStatic { static int add(int first, int second){ return first+second; } }
32. @Test fun staticMock() { val result = CalculatorStatic.add(1, 2) assert(result).toBe(3) }
33. @Test fun staticMock() { val result = CalculatorStatic.add(1, 2) assert(result).toBe(3) mockkStatic(CalculatorStatic ::class) }
34. @Test fun staticMock() { val result = CalculatorStatic.add(1, 2) assert(result).toBe(3) mockkStatic(CalculatorStatic ::class) every { CalculatorStatic.add(1, 2) } returns 42 }
35. @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) }
36. @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) assert(mockedResult).toBe(42) }
37. COROUTINES
38. data class User(val userId: String, val userName: String) interface UserApi { suspend fun deleteUser(userId: String): Boolean }
39. 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) } }
40. @Test fun basicTest() = runBlocking { }
41. @Test fun basicTest() = runBlocking { val userApi: UserApi = mockk() val userManager = UserManager(userApi) val userId = "123" val user: User = mockk() every { user.userId } returns userId }
42. @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 }
43. @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) }
44. @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) assert(result).toBe(true) coVerify { userApi.deleteUser(userId) } }
45. LIMITASYONLAR ➤ final static ➤ inline fonksiyonlar
46. UNIT TESTS WITHOUT INTEGRATION TESTS (ZORUNLU GIF)
47. TEŞEKKÜRLER HTTPS://MOCKK.IO/