GreetingServiceMockTest.kt

@RunWith(MockitoJUnitRunner::class)
class GreetingServiceMockTest {

    @get:Rule
    var toothPickRule = ToothPickRule(this, "scope")

    @Inject
    lateinit var greetingService: GreetingService

    @Mock
    lateinit var timeService: TimeService

    @Before
    fun setup() = toothPickRule.scope.installModules(toothpickModule).inject(this)

    @Test
    fun testGreetingInTheMorning() {
        whenever(timeService.getHourOfDay()).thenReturn(9)
        assertEquals("Good morning, welcome to Toothpick", greetingService.greetings())
    }
}