Replace remaining AsyncTask with RxAndroid (#2681)

app/src/test/kotlin/fr/free/nrw/commons/review/ReviewHelperTest.kt

@@ -0,0 +1,69 @@
+package fr.free.nrw.commons.review
+
+import fr.free.nrw.commons.Media
+import fr.free.nrw.commons.media.model.MwQueryPage
+import fr.free.nrw.commons.mwapi.MediaWikiApi
+import fr.free.nrw.commons.mwapi.OkHttpJsonApiClient
+import fr.free.nrw.commons.mwapi.model.RecentChange
+import io.reactivex.Single
+import junit.framework.Assert.assertTrue
+import org.junit.Before
+import org.junit.Test
+import org.mockito.ArgumentMatchers
+import org.mockito.InjectMocks
+import org.mockito.Mock
+import org.mockito.Mockito.`when`
+import org.mockito.Mockito.mock
+import org.mockito.MockitoAnnotations
+
+/**
+ * Test class for ReviewHelper
+ */
+class ReviewHelperTest {
+
+    @Mock
+    internal var okHttpJsonApiClient: OkHttpJsonApiClient? = null
+    @Mock
+    internal var mediaWikiApi: MediaWikiApi? = null
+
+    @InjectMocks
+    var reviewHelper: ReviewHelper? = null
+
+    /**
+     * Init mocks
+     */
+    @Before
+    @Throws(Exception::class)
+    fun setUp() {
+        MockitoAnnotations.initMocks(this)
+    }
+
+    /**
+     * Test for getting random media
+     */
+    @Test
+    fun getRandomMedia() {
+        `when`(okHttpJsonApiClient?.recentFileChanges)
+                .thenReturn(Single.just(listOf(RecentChange("test", "File:Test1.jpeg", "0"),
+                        RecentChange("test", "File:Test2.png", "0"),
+                        RecentChange("test", "File:Test3.jpg", "0"))))
+
+        `when`(mediaWikiApi?.pageExists(ArgumentMatchers.anyString()))
+                .thenReturn(Single.just(true))
+        val randomMedia = reviewHelper?.randomMedia?.blockingGet()
+
+        assertTrue(randomMedia is Media)
+    }
+
+    /**
+     * Test for getting first revision of file
+     */
+    @Test
+    fun getFirstRevisionOfFile() {
+        `when`(okHttpJsonApiClient?.getFirstRevisionOfFile(ArgumentMatchers.anyString()))
+                .thenReturn(Single.just(mock(MwQueryPage.Revision::class.java)))
+        val firstRevisionOfFile = reviewHelper?.getFirstRevisionOfFile("Test.jpg")?.blockingGet()
+
+        assertTrue(firstRevisionOfFile is MwQueryPage.Revision)
+    }
+}