kotlin_testing_pt2_example_2

kotlin_testing_pt2_example_2.kt

class Coordinate(latitude: Double, longitude: Double)

interface LocationProvider {
    fun getLastKnownLocation(): Coordinate
    fun getExactLocation(): Coordinate
}

interface TemperatureProvider {
    fun getCelsiusTemperatureAt(coordinate: Coordinate): Float
}

interface View {
    fun displayTemperature(temperature: Float)
}

class TemperaturePresenter(
        private val locationProvider: LocationProvider,
        private val temperatureProvider: TemperatureProvider,
        private val view: View) {

    fun start() {
        val lastLocation = locationProvider.getLastKnownLocation()
        val inaccurateTemperature = 
            temperatureProvider.getCelsiusTemperatureAt(lastLocation)

        view.displayTemperature(inaccurateTemperature)

        val exactLocation = locationProvider.getExactLocation()
        val accurateTemperature = 
            temperatureProvider.getCelsiusTemperatureAt(exactLocation)

        view.displayTemperature(accurateTemperature)
    }
}