Unit-Tests for Campaigns (commons-app#3258)

Author: ashishkumar468

app/src/main/java/fr/free/nrw/commons/campaigns/CampaignsPresenter.java

@@ -1,7 +1,12 @@
 package fr.free.nrw.commons.campaigns;
 
+import static fr.free.nrw.commons.di.CommonsApplicationModule.IO_THREAD;
+import static fr.free.nrw.commons.di.CommonsApplicationModule.MAIN_THREAD;
+
 import android.annotation.SuppressLint;
 
+import io.reactivex.Scheduler;
+import javax.inject.Named;
 import org.wikipedia.util.DateUtil;
 
 import java.text.ParseException;
@@ -30,14 +35,18 @@
 @Singleton
 public class CampaignsPresenter implements BasePresenter<ICampaignsView> {
     private final OkHttpJsonApiClient okHttpJsonApiClient;
+    private final Scheduler mainThreadScheduler;
+    private final Scheduler ioScheduler;
 
     private ICampaignsView view;
     private Disposable disposable;
     private Campaign campaign;
 
     @Inject
-    public CampaignsPresenter(OkHttpJsonApiClient okHttpJsonApiClient) {
+    public CampaignsPresenter(OkHttpJsonApiClient okHttpJsonApiClient, @Named(IO_THREAD)Scheduler ioScheduler, @Named(MAIN_THREAD)Scheduler mainThreadScheduler) {
         this.okHttpJsonApiClient = okHttpJsonApiClient;
+        this.mainThreadScheduler=mainThreadScheduler;
+        this.ioScheduler=ioScheduler;
     }
 
     @Override
@@ -64,8 +73,8 @@ public void getCampaigns() {
                 return;
             }
             Single<CampaignResponseDTO> campaigns = okHttpJsonApiClient.getCampaigns();
-            campaigns.observeOn(AndroidSchedulers.mainThread())
-                .subscribeOn(Schedulers.io())
+            campaigns.observeOn(mainThreadScheduler)
+                .subscribeOn(ioScheduler)
                 .subscribeWith(new SingleObserver<CampaignResponseDTO>() {
 
                     @Override public void onSubscribe(Disposable d) {
@@ -77,6 +86,7 @@ public void getCampaigns() {
                         if (campaigns == null || campaigns.isEmpty()) {
                             Timber.e("The campaigns list is empty");
                             view.showCampaigns(null);
+                            return;
                         }
                         Collections.sort(campaigns, (campaign, t1) -> {
                             Date date1, date2;

app/src/test/kotlin/fr/free/nrw/commons/campaigns/CampaignsPresenterTest.kt

@@ -0,0 +1,77 @@
+package fr.free.nrw.commons.campaigns
+
+import com.nhaarman.mockito_kotlin.verify
+import fr.free.nrw.commons.mwapi.OkHttpJsonApiClient
+import io.reactivex.Single
+import io.reactivex.schedulers.TestScheduler
+import org.junit.Before
+import org.junit.Test
+import org.mockito.Mock
+import org.mockito.Mockito
+import org.mockito.MockitoAnnotations
+import java.text.SimpleDateFormat
+import java.util.*
+import kotlin.collections.ArrayList
+
+class CampaignsPresenterTest {
+    @Mock
+    var okHttpJsonApiClient: OkHttpJsonApiClient? = null
+
+    lateinit var campaignsPresenter: CampaignsPresenter
+
+    @Mock
+    internal var view: ICampaignsView? = null
+
+    @Mock
+    internal var campaignResponseDTO: CampaignResponseDTO? = null
+    lateinit var campaignsSingle: Single<CampaignResponseDTO>
+
+    @Mock
+    var campaign: Campaign? = null
+
+    lateinit var testScheduler: TestScheduler
+
+    /**
+     * initial setup, test environment
+     */
+    @Before
+    @Throws(Exception::class)
+    fun setUp() {
+        MockitoAnnotations.initMocks(this)
+        testScheduler=TestScheduler()
+        campaignsSingle= Single.just(campaignResponseDTO)
+        campaignsPresenter= CampaignsPresenter(okHttpJsonApiClient,testScheduler,testScheduler)
+        campaignsPresenter?.onAttachView(view)
+        Mockito.`when`(okHttpJsonApiClient?.campaigns).thenReturn(campaignsSingle)
+    }
+
+    @Test
+    fun getCampaignsTestNoCampaigns() {
+        campaignsPresenter.getCampaigns()
+        verify(okHttpJsonApiClient)?.campaigns
+        testScheduler.triggerActions()
+        verify(view)?.showCampaigns(null)
+    }
+
+    @Test
+    fun getCampaignsTestNonEmptyCampaigns() {
+        campaignsPresenter.getCampaigns()
+        var campaigns= ArrayList<Campaign>()
+        campaigns.add(campaign!!)
+        val simpleDateFormat = SimpleDateFormat("yyyy-MM-dd", Locale.ROOT)
+        simpleDateFormat.timeZone = TimeZone.getTimeZone("UTC")
+        Mockito.`when`(campaignResponseDTO?.campaigns).thenReturn(campaigns)
+        var calendar = Calendar.getInstance()
+        calendar.add(Calendar.DATE,-1)
+        val startDateString = simpleDateFormat.format(calendar.time).toString()
+        calendar= Calendar.getInstance()
+        calendar.add(Calendar.DATE,3)
+        val endDateString= simpleDateFormat.format(calendar.time).toString()
+        Mockito.`when`(campaign?.endDate).thenReturn(endDateString)
+        Mockito.`when`(campaign?.startDate).thenReturn(startDateString)
+        Mockito.`when`(campaignResponseDTO?.campaigns).thenReturn(campaigns)
+        verify(okHttpJsonApiClient)?.campaigns
+        testScheduler.triggerActions()
+        verify(view)?.showCampaigns(campaign)
+    }
+}