Unit-Tests for Campaigns (#3258)

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)
+    }
+}