kotlin_testing_pt2_example_1_test_3

kotlin_testing_pt2_example_1_test_3.kt

class TemperaturePresenterTest {

  private val lastLocation = Coordinate(41.5, 8.9)
  private val currentLocation = Coordinate(38.7, 9.7)

  val locationProvider: LocationProvider = mock {
      on { getLastKnownLocation() }.then { lastLocation }
      on { getExactLocation() }.then { currentLocation }
  }

  val temperatureProvider: TemperatureProvider = mock()
  val view: View = mock()

  var tested: TemperaturePresenter = TemperaturePresenter(
            locationProvider, temperatureProvider, view)

  @Test
  fun `display temperature for last known location first, and then for exact location`() {
      whenever(temperatureProvider.getCelsiusTemperatureAt(lastLocation))
              .thenReturn(18f)

      whenever(temperatureProvider.getCelsiusTemperatureAt(currentLocation))
              .thenReturn(21f)

      tested.start()

      inOrder(temperatureProvider, view).apply {
          verify(temperatureProvider).getCelsiusTemperatureAt(lastLocation)
          verify(view).displayTemperature(18f)

          verify(temperatureProvider).getCelsiusTemperatureAt(currentLocation)
          verify(view).displayTemperature(21f)
      }
  }
}