Added unit-tests for CacheController (#3275)

app/src/main/java/fr/free/nrw/commons/caching/CacheController.java

@@ -23,8 +23,8 @@ public class CacheController {
     private static final int EARTH_RADIUS = 6378137;
 
     @Inject
-    CacheController() {
+    public CacheController(QuadTree quadTree) {
-        quadTree = new QuadTree<>(-180, -90, +180, +90);
+        this.quadTree = quadTree;
     }
 
     public void setQtPoint(double decLongitude, double decLatitude) {

app/src/main/java/fr/free/nrw/commons/di/CommonsApplicationModule.java

@@ -7,6 +7,7 @@ import android.view.inputmethod.InputMethodManager;
 
 import androidx.collection.LruCache;
 
+import com.github.varunpant.quadtree.QuadTree;
 import com.google.gson.Gson;
 
 import org.wikipedia.AppAdapter;
@@ -26,6 +27,7 @@ import fr.free.nrw.commons.BuildConfig;
 import fr.free.nrw.commons.R;
 import fr.free.nrw.commons.auth.AccountUtil;
 import fr.free.nrw.commons.auth.SessionManager;
+import fr.free.nrw.commons.caching.CacheController;
 import fr.free.nrw.commons.data.DBOpenHelper;
 import fr.free.nrw.commons.kvstore.JsonKvStore;
 import fr.free.nrw.commons.location.LocationServiceManager;
@@ -197,4 +199,14 @@ public class CommonsApplicationModule {
     public String provideLoggedInUsername() {
         return Objects.toString(AppAdapter.get().getUserName(), "");
     }
+
+    /**
+     * Provides quad tree
+     *
+     * @return
+     */
+    @Provides
+    public QuadTree providesQuadTres() {
+        return new QuadTree<>(-180, -90, +180, +90);
+    }
 }

app/src/test/kotlin/fr/free/nrw/commons/cache/CacheControllerTest.kt

@@ -0,0 +1,48 @@
+package fr.free.nrw.commons.cache
+
+import com.github.varunpant.quadtree.Point
+import com.github.varunpant.quadtree.QuadTree
+import com.nhaarman.mockito_kotlin.verify
+import fr.free.nrw.commons.caching.CacheController
+import org.junit.Before
+import org.junit.Test
+import org.mockito.ArgumentMatchers
+import org.mockito.Mock
+import org.mockito.Mockito
+import org.mockito.MockitoAnnotations
+
+class CacheControllerTest {
+    /**
+     * initial setup, test environment
+     */
+    private lateinit var cacheController: CacheController
+
+    @Mock
+    private lateinit var quadTree: QuadTree<List<String>>
+
+    private lateinit var points: Array<Point<List<String>>>
+
+    var value = ArrayList<String>()
+
+
+    @Before
+    @Throws(Exception::class)
+    fun setUp() {
+        MockitoAnnotations.initMocks(this)
+        val point = Point<List<String>>(1.0, 1.0, value)
+        points = arrayOf(point)
+        value.add("1")
+        cacheController = CacheController(quadTree)
+        Mockito.`when`(quadTree.searchWithin(ArgumentMatchers.anyDouble(), ArgumentMatchers.anyDouble(), ArgumentMatchers.anyDouble(), ArgumentMatchers.anyDouble())).thenReturn(points)
+    }
+
+    /**
+     * Test find category
+     */
+    @Test
+    fun testFindCategory() {
+        val findCategory = cacheController.findCategory()
+        verify(quadTree).searchWithin(ArgumentMatchers.anyDouble(), ArgumentMatchers.anyDouble(), ArgumentMatchers.anyDouble(), ArgumentMatchers.anyDouble())
+        assert(findCategory.size == 1)
+    }
+}