Mockk

@Mockk
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@Mockk

Mockk which is similar to Mockito but better suited for Kotlin.

@ExtendWith(MockKExtension::class)
internal class UserServiceTest: DescribeSpec() {

    companion object {
        private const val DUPLICATED_EMAIL = "abc@naver.com"
    }

    @MockK private lateinit var userStore: UserStore
    @MockK private lateinit var userReader: UserReader
    @InjectMockKs private lateinit var userService: UserService

    init {
        describe("회원 가입") {
            val validUser = UserCommand.RegisterUser(email = DUPLICATED_EMAIL, password = "123!abACC123")

            it("이메일이 중복되는 경우 회원 가입 실패") {
                assertThrows<DuplicatedEmailException> { userService.register(validUser) }
            }
        }
    }

    override fun beforeEach(testCase: TestCase) {
        // Unit-returning functions to be relaxed
        MockKAnnotations.init(this, relaxUnitFun = true)

        every { userReader.existsByEmail(DUPLICATED_EMAIL) } returns true
        every { userStore.register(any()) } just Runs
    }
}

MockKAnnotations: Initializes properties annotated with @MockK, @RelaxedMockK, @Slot and @SpyK in provided object.
@Mockk: If you want use to this annotation then follow guides
- ```
@MockK
@AdditionalInterface(Runnable::class)
private lateinit var car: Car
```
- Dependency Injection: lateinit var

@Mockk

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