include roboelectric test to verify db backup is created when

initializing the db for the very first time.

Bug: 141472083
Change-Id: I84d3487bb296bf445323906e8a2d3734b1aa8594

robolectric_tests/src/com/android/launcher3/model/BackupRestoreTest.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2020 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.launcher3.model;
+
+import static com.android.launcher3.LauncherSettings.Favorites.BACKUP_TABLE_NAME;
+import static com.android.launcher3.provider.LauncherDbUtils.tableExists;
+
+import static org.junit.Assert.assertTrue;
+
+import android.database.sqlite.SQLiteDatabase;
+
+import com.android.launcher3.util.LauncherModelHelper;
+import com.android.launcher3.util.LauncherRoboTestRunner;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.annotation.LooperMode;
+
+/**
+ * Tests to verify backup and restore flow.
+ */
+@RunWith(LauncherRoboTestRunner.class)
+@LooperMode(LooperMode.Mode.PAUSED)
+public class BackupRestoreTest {
+
+    private LauncherModelHelper mModelHelper;
+    private SQLiteDatabase mDb;
+
+    @Before
+    public void setUp() {
+        mModelHelper = new LauncherModelHelper();
+        mDb = mModelHelper.provider.getDbWithRestoreDbTask();
+    }
+
+    @Test
+    public void testOnCreateDbIfNotExists_CreatesBackup() {
+        assertTrue(tableExists(mDb, BACKUP_TABLE_NAME));
+    }
+}

robolectric_tests/src/com/android/launcher3/util/TestLauncherProvider.java

@@ -4,6 +4,7 @@ import android.content.Context;
 import android.database.sqlite.SQLiteDatabase;
 
 import com.android.launcher3.LauncherProvider;
+import com.android.launcher3.provider.RestoreDbTask;
 
 /**
  * An extension of LauncherProvider backed up by in-memory database.
@@ -33,6 +34,12 @@ public class TestLauncherProvider extends LauncherProvider {
         return mOpenHelper.getWritableDatabase();
     }
 
+    public SQLiteDatabase getDbWithRestoreDbTask() {
+        RestoreDbTask.setPending(getContext(), true);
+        super.createDbIfNotExists();
+        return mOpenHelper.getWritableDatabase();
+    }
+
     private static class MyDatabaseHelper extends DatabaseHelper {
 
         private final boolean mAllowLoadDefaultFavorites;