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diff --git a/tests/src/com/android/wallpaper/testing/TestCategoryProvider.java b/tests/src/com/android/wallpaper/testing/TestCategoryProvider.java
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+++ b/tests/src/com/android/wallpaper/testing/TestCategoryProvider.java
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+/*
+ * Copyright (C) 2019 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.wallpaper.testing;
+
+import android.os.Handler;
+
+import com.android.wallpaper.model.Category;
+import com.android.wallpaper.model.CategoryProvider;
+import com.android.wallpaper.model.CategoryReceiver;
+import com.android.wallpaper.model.ImageCategory;
+import com.android.wallpaper.model.WallpaperInfo;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Test implementation of {@link CategoryProvider}.
+ */
+public class TestCategoryProvider implements CategoryProvider {
+    private final List<Category> mCategories;
+
+    public TestCategoryProvider() {
+        Category category1 = new ImageCategory(
+                "My photos" /* title */,
+                "image_wallpapers" /* collection */,
+                0 /* priority */);
+
+        ArrayList<WallpaperInfo> wallpapers = new ArrayList<>();
+        WallpaperInfo wallpaperInfo = new com.android.wallpaper.testing.TestWallpaperInfo(0);
+        wallpapers.add(wallpaperInfo);
+        Category category2 = new com.android.wallpaper.testing.TestWallpaperCategory(
+                "Test category", "init_collection", wallpapers,
+                1 /* priority */);
+
+        mCategories = new ArrayList<>();
+        mCategories.add(category1);
+        mCategories.add(category2);
+    }
+
+    @Override
+    public void fetchCategories(CategoryReceiver receiver, boolean forceRefresh) {
+        // Mimic real behavior by fetching asynchronously.
+        new Handler().post(new Runnable() {
+            @Override
+            public void run() {
+                List<Category> categories = getTestCategories();
+                for (Category category : categories) {
+                    receiver.onCategoryReceived(category);
+                }
+                receiver.doneFetchingCategories();
+            }
+        });
+    }
+
+    @Override
+    public int getSize() {
+        return mCategories == null ? 0 : mCategories.size();
+    }
+
+    @Override
+    public Category getCategory(int index) {
+        return mCategories == null ? null : mCategories.get(index);
+    }
+
+    @Override
+    public Category getCategory(String collectionId) {
+        Category category;
+        for (int i = 0; i < mCategories.size(); i++) {
+            category = mCategories.get(i);
+            if (category.getCollectionId().equals(collectionId)) {
+                return category;
+            }
+        }
+        return null;
+    }
+
+    /** Returns a list of test Category objects used by this TestCategoryProvider. */
+    public List<Category> getTestCategories() {
+        return mCategories;
+    }
+}