kotlin

kotlin_testing_pt2_example_1_test_1.kt

class TemperaturePresenterTest {

    @Mock lateinit var locationProvider: LocationProvider
    @Mock lateinit var temperatureProvider: TemperatureProvider
    @Mock lateinit var view: View

    lateinit var tested: TemperaturePresenter

    @Before
    fun setUp() {
        MockitoAnnotations.initMocks(this)

        tested = TemperaturePresenter(locationProvider, temperatureProvider, view)
    }

    @Test
    fun testInexactTemperatureIsDisplayedFollowedByExactTemperature() {
        val lastLocation = Coordinate(41.5, 8.9)
        val currentLocation = Coordinate(38.7, 9.7)

        Mockito.`when`(locationProvider.getLastKnownLocation())
            .thenReturn(lastLocation)
        
        Mockito.`when`(locationProvider.getExactLocation())
            .thenReturn(currentLocation)

        Mockito.`when`(temperatureProvider.getCelsiusTemperatureAt(lastLocation))
            .thenReturn(18f)
        
        Mockito.`when`(temperatureProvider.getCelsiusTemperatureAt(currentLocation))
            .thenReturn(21f)

        tested.start()

        val inOrder = Mockito.inOrder(temperatureProvider, view)

        inOrder.verify<TemperatureProvider>(temperatureProvider)
            .getCelsiusTemperatureAt(lastLocation)

        inOrder.verify<View>(view).displayTemperature(18f)

        inOrder.verify<TemperatureProvider>(temperatureProvider)
            .getCelsiusTemperatureAt(currentLocation)

        inOrder.verify<View>(view).displayTemperature(21f)
    }
}