Example of toothpick junit5+mockito test

ToothpickJunit5Mockito.kt

class MyCalendarPresenter @Inject constructor(private val view: IMycalendarView,
                                              private val repository: IUserMemoriesRepository) {

    fun onAttach() {
        view.showUserMemories(getMemories())
    }

    fun getMemories(): String {
        return "memories"
    }
}

// ----------------------------

interface IUserMemoriesRepository {
    fun getUserMemories(): String
}

// ----------------------------

class MyCalendarController : Controller(), IMycalendarView {

    @Inject
    lateinit var presenter: MyCalendarPresenter

    private val diHelper = DiHelper(this, Scopes.MY_CALENDAR_SCOPE)
        .init { it.installModules(MyCalendarModule(this)) }

    override fun onCreateView(@NonNull inflater: LayoutInflater, @NonNull container: ViewGroup): View {
        return inflater.inflate(R.layout.controller_my_calendar, container, false)
    }

    override fun onAttach(view: View) {
        super.onAttach(view)
        presenter.onAttach()
    }

    override fun onDestroy() {
        super.onDestroy()
        diHelper.close()
    }

    override fun showUserMemories(txt: String) {
        view?.txt?.text = txt
    }
}

// ----------------------------

@ExtendWith(MockitoExtension::class)
@MockitoSettings(strictness = Strictness.LENIENT)
class MyCalendarPresenterTest {

    @RegisterExtension val toothPickExtension: ToothPickExtension = ToothPickExtension(this, "Foo")

    @Mock
    lateinit var view: IMycalendarView
    @Mock
    lateinit var userMemoriesRepository: IUserMemoriesRepository

    lateinit var presenter: MyCalendarPresenter

    @Test
    fun onAttach_Ok() {
        //1
        val memories = "memories"

        //2
        whenever(userMemoriesRepository.getUserMemories()).thenReturn(memories)

        //3
        presenter = toothPickExtension.getInstance(MyCalendarPresenter::class.java)
        presenter.onAttach()

        //4
        verify(view).showUserMemories(eq(memories))
    }
}