1 files changed, 95 insertions, 0 deletions
diff --git a/quickstep/tests/src/com/android/quickstep/TaskThumbnailCacheTest.java b/quickstep/tests/src/com/android/quickstep/TaskThumbnailCacheTest.java
new file mode 100644
index 0000000000..4e04261e5c
--- /dev/null
+++ b/quickstep/tests/src/com/android/quickstep/TaskThumbnailCacheTest.java
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.quickstep;
+
+import static junit.framework.Assert.assertFalse;
+import static junit.framework.Assert.assertTrue;
+
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+import android.content.res.Resources;
+
+import androidx.test.filters.SmallTest;
+
+import com.android.launcher3.R;
+import com.android.quickstep.util.TaskKeyCache;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+import java.util.concurrent.Executor;
+
+@SmallTest
+public class TaskThumbnailCacheTest {
+    @Mock
+    private Context mContext;
+
+    @Mock
+    private Resources mResource;
+
+    @Mock
+    private TaskKeyCache mTaskKeyCache;
+
+    @Before
+    public void setup() throws NoSuchFieldException {
+        MockitoAnnotations.initMocks(this);
+        when(mContext.getResources()).thenReturn(mResource);
+    }
+
+    @Test
+    public void increaseCacheSize() {
+        // Mock a cache size increase from 3 to 8
+        when(mTaskKeyCache.getMaxSize()).thenReturn(3);
+        when(mResource.getInteger((R.integer.recentsThumbnailCacheSize))).thenReturn(8);
+        TaskThumbnailCache thumbnailCache = new TaskThumbnailCache(mContext, mock(Executor.class),
+                mTaskKeyCache);
+
+        // Preload is needed when increasing size
+        assertTrue(thumbnailCache.updateCacheSizeAndRemoveExcess());
+        verify(mTaskKeyCache, times(1)).updateCacheSizeAndRemoveExcess(8);
+    }
+
+    @Test
+    public void decreaseCacheSize() {
+        // Mock a cache size decrease from 8 to 3
+        when(mTaskKeyCache.getMaxSize()).thenReturn(8);
+        when(mResource.getInteger((R.integer.recentsThumbnailCacheSize))).thenReturn(3);
+        TaskThumbnailCache thumbnailCache = new TaskThumbnailCache(mContext, mock(Executor.class),
+                mTaskKeyCache);
+        // Preload is not needed when decreasing size
+        assertFalse(thumbnailCache.updateCacheSizeAndRemoveExcess());
+        verify(mTaskKeyCache, times(1)).updateCacheSizeAndRemoveExcess(3);
+    }
+
+    @Test
+    public void keepSameCacheSize() {
+        when(mTaskKeyCache.getMaxSize()).thenReturn(3);
+        when(mResource.getInteger((R.integer.recentsThumbnailCacheSize))).thenReturn(3);
+        TaskThumbnailCache thumbnailCache = new TaskThumbnailCache(mContext, mock(Executor.class),
+                mTaskKeyCache);
+        // Preload is not needed when it has the same cache size
+        assertFalse(thumbnailCache.updateCacheSizeAndRemoveExcess());
+        verify(mTaskKeyCache, never()).updateCacheSizeAndRemoveExcess(anyInt());
+    }
+}