1. JUnit 5
kotlin
import org.junit.jupiter.api.Test
import org.junit.jupiter.api.Assertions.assertEquals
class MyTest {
@Test
fun myTestMethod() {
val result = 2 + 2
assertEquals(4, result)
}
}
2. Spek
kotlin
import org.spekframework.spek2.Spek
import org.spekframework.spek2.style.gherkin.Feature
object MySpec : Spek({
Feature("Calculator") {
Scenario("Adding two numbers") {
val calculator = Calculator()
Given("two numbers") {
val a = 2
val b = 3
}
When("adding them") {
calculator.add(a, b)
}
Then("the result should be their sum") {
assertEquals(5, calculator.result)
}
}
}
})
3. Kotest
kotlin
import io.kotest.core.spec.style.BehaviorSpec
import io.kotest.matchers.shouldBe
class MyTest : BehaviorSpec() {
init {
given("two numbers") {
val a = 2
val b = 3
`when`("adding them") {
val result = a + b
then("the result should be their sum") {
result shouldBe 5
}
}
}
}
}
4. MockK
kotlin
import io.mockk.every
import io.mockk.mockk
import io.mockk.verify
interface UserRepository {
fun getUser(id: String): User
}
class UserService(private val userRepository: UserRepository) {
fun getUserByUsername(username: String): User? {
val user = userRepository.getUser(username)
return if (user.username == username) user else null
}
}
class UserServiceTest {
private val userRepository: UserRepository = mockk()
private val userService = UserService(userRepository)
@Test
fun testGetUserByUsername() {
val user = User("john", "John Doe")
every { userRepository.getUser("john") } returns user
val result = userService.getUserByUsername("john")
assertEquals(user, result)
verify { userRepository.getUser("john") }
}
}
