How do I use mocking in Kotlin tests?

How do I use mocking in Kotlin tests?

You can use libraries like Mockito or MockK for mocking in Kotlin tests. Would you like an example?

Yes, please provide an example using MockK.

Sure! Here's a simple example:

class UserService(private val userRepository: UserRepository) {
    fun getUser(id: String): User? {
        return userRepository.findById(id)
    }
}

class UserServiceTest {
    private val userRepository = mockk<UserRepository>()
    private val userService = UserService(userRepository)

    @Test
    fun testGetUser() {
        val user = User("1", "John Doe")
        every { userRepository.findById("1") } returns user

        val result = userService.getUser("1")
        assertEquals(user, result)
    }
}

This mocks the UserRepository to return a predefined user.

What are the advantages of using MockK over Mockito?

MockK is designed specifically for Kotlin, offering features like coroutines support and more concise syntax. It also handles final classes and methods better.