IvanShafran

class ShowRateUsLogicTest : Spek({
    // property declaration, setup and preparation are skipped
    describe("show rate us logic") {
        context("first conditions checks") {
            context("buy clicked once") {
                beforeEachTest {
                    prepareConditions(buyClickedTimes = 1)
                }

                it("should not show 'rate us'") {

IvanShafran

class ShowRateUsLogicTest {
    // property declaration and setup are skipped
    private fun prepareConditions(
        buyClickedTimes: Int = 0, 
        isNeverShownAgainClicked: Boolean = false,
        isRateNowClicked: Boolean = false, 
        lastShownTimeMillis: Long = 0, 
        currentTimeMillis: Long = 0
    ) {
        repeat(buyClickedTimes) { buyPreferences.incrementBuyCount() }

IvanShafran

public class ShowRateUsLogicTest {
    // property declaration is skipped
    @Before public void setUp() {
        final Context mockedContext = new SPMockBuilder().createContext();
        rateUsPreferences = new RateUsPreferencesImpl(mockedContext);
        buyPreferences = new BuyPreferencesImpl(mockedContext);
        time = Mockito.mock(Time.class);
        showRateUsLogic = new ShowRateUsLogic(rateUsPreferences, buyPreferences, time);
    }

IvanShafran

public class ShowRateUsLogicTest {
    // property declaration is skipped
    @Before public void setUp() {
        rateUsPreferences = new RateUsPreferencesMock();
        buyPreferences = new BuyPreferencesMock();
        time = new TimeMock();
        showRateUsLogic = new ShowRateUsLogic(rateUsPreferences, buyPreferences, time);
    }

    @Test public void onFirstCheckAndOneClickItShouldNotShow() {

IvanShafran

public class ShowRateUsLogicTest {
    private RateUsPreferencesMock rateUsPreferences;
    private BuyPreferencesMock buyPreferences;
    private TimeMock time;
    private ShowRateUsLogic showRateUsLogic;

    @Test public void test1() {
        rateUsPreferences = new RateUsPreferencesMock();
        buyPreferences = new BuyPreferencesMock();
        time = new TimeMock();

IvanShafran

public class BuyPreferencesMock implements BuyPreferences {
    private int count;

    @Override public void incrementBuyCount() {
        ++count;
    }

    @Override public int getBuyCount() {
        return count;
    }

IvanShafran

class ShowRateUsLogic(
    private val rateUsPreferences: RateUsPreferences,
    private val buyPreferences: BuyPreferences,
    private val time: Time
) {
    fun shouldShowRateUs(): Boolean {
        val timeFromLastShown = time.getCurrentTimeMillis() - rateUsPreferences.getLastShownTimeMillis()
        return when {
            // User doesn't want to see "rate us" again
            rateUsPreferences.isNeverShownAgainClicked() -> false

IvanShafran

interface Time {
    fun getCurrentTimeMillis(): Long
}

class TimeImpl : Time {
    override fun getCurrentTimeMillis() = System.currentTimeMillis()
}

IvanShafran

class BuyPreferencesImpl(context: Context) : BuyPreferences {
    companion object {
        private val PREFERENCES_FILENAME = "BUY_PREFERENCES"
        private val BUY_COUNT_KEY = "BUY_COUNT_KEY"
    }

    private val sharedPreferences = context.getSharedPreferences(
        PREFERENCES_FILENAME, 
        Context.MODE_PRIVATE
    )

IvanShafran

interface BuyPreferences {
    fun incrementBuyCount()
    fun getBuyCount(): Int
}

class BuyPreferencesImpl(context: Context) : BuyPreferences {
    // ...
    private val sharedPreferences: SharedPreferences = context.getSharedPreferences(...)

    override fun incrementBuyCount() {