KtorEasy controller testing: controller's testing

CreateUserTest.kt

@TestInstance(TestInstance.Lifecycle.PER_CLASS)
class CreateUserTest : BaseControllerTest() {

    private val userApi: UserApi = mockk()
    private val controller: RegistrationController by lazy { RegistrationControllerImp() }
    private val userId = 11

    init {
        startInjection(
            module {
                single(override = true) { userApi }
            }
        )
    }

    @BeforeEach
    override fun before() {
        super.before()
        clearMocks(userApi)
    }

    @Test
    fun `when creating user with correct information and user not taken, we return a valid ResponseUser`() {
        val postUser = givenAValidPostUserBody()
        val createdUser = givenAnUser(userId)

        // Arrange
        coEvery { userApi.getUserByUsername(any()) } returns null
        coEvery { userApi.createUser(any()) } returns createdUser

        runBlocking {

            // call to subject under test (Act)
            val responseUser = controller.createUser(postUser)


            // Assert
            assertThat(responseUser.id).isEqualTo(userId)
            assertThat(responseUser.name).isEqualTo(postUser.name)
            assertThat(responseUser.secondname).isEqualTo(postUser.secondname)
            assertThat(responseUser.username).isEqualTo(createdUser.username)
        }

    }
}