Add a deletion helper view for clearing space.

This view provides an interface which allows users to clear out
apps and other data which they may no longer need to alleviate
storage pressure. This implementation gives the bits to uninstall
apps which have not been used within the last 60 days from the
system.

A future patch will add in the ability to extend the deletion helper
view to have additional clearing types.

Change-Id: I65cba54ca247d52227e67e2fa9b84fe63fb8ab34
(cherry picked from commit a671272bf6)

tests/unit/src/com/android/settings/deletionhelper/PackageDeletionTaskTest.java

@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2016 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.settings.deletionhelper;
+
+import android.test.AndroidTestCase;
+import android.content.pm.IPackageDeleteObserver;
+import android.content.pm.PackageManager;
+import android.os.RemoteException;
+import android.test.mock.MockPackageManager;
+import android.test.suitebuilder.annotation.SmallTest;
+
+import com.android.settings.deletionhelper.PackageDeletionTask;
+import com.android.settings.deletionhelper.PackageDeletionTask.Callback;
+
+import java.util.Set;
+import java.util.HashSet;
+
+public class PackageDeletionTaskTest extends AndroidTestCase {
+    private FakePackageManager mPackageManager;
+    private Set<String> mDeletedApps;
+
+    @Override
+    protected void setUp() throws Exception {
+        mPackageManager = new FakePackageManager();
+        mDeletedApps = new HashSet<String>();
+    }
+
+    @SmallTest
+    public void testDeleteNoApps() throws Exception {
+        runTask(new HashSet<String>(), false);
+    }
+
+    @SmallTest
+    public void testDeleteOneApp() throws Exception {
+        HashSet<String> appsToDelete = new HashSet<String>();
+        appsToDelete.add("app.test1");
+        runTask(appsToDelete, false);
+    }
+
+    @SmallTest
+    public void testDeleteManyApps() throws Exception {
+        HashSet<String> appsToDelete = new HashSet<String>();
+        appsToDelete.add("app.test1");
+        appsToDelete.add("app.test2");
+        runTask(appsToDelete, false);
+    }
+
+    @SmallTest
+    public void testDeleteFails() throws Exception {
+        HashSet<String> appsToDelete = new HashSet<String>();
+        appsToDelete.add("app.test1");
+        mPackageManager.deletionSucceeds = false;
+        runTask(appsToDelete, true);
+    }
+
+    private void runTask(HashSet<String> appsToDelete, boolean shouldFail) {
+        PackageDeletionTask task = new PackageDeletionTask(mPackageManager, appsToDelete,
+                new VerifierCallback(appsToDelete, shouldFail));
+        task.run();
+    }
+
+    class FakePackageManager extends MockPackageManager {
+        public boolean deletionSucceeds = true;
+
+        @Override
+        public void deletePackageAsUser(String packageName, IPackageDeleteObserver observer,
+                                        int flags, int userId) {
+            int resultCode;
+            if (deletionSucceeds) {
+                resultCode = PackageManager.DELETE_SUCCEEDED;
+                mDeletedApps.add(packageName);
+            } else {
+                resultCode = PackageManager.DELETE_FAILED_INTERNAL_ERROR;
+            }
+
+            try {
+                observer.packageDeleted(packageName, resultCode);
+            } catch (RemoteException e) {
+                fail(e.toString());
+            }
+        }
+    }
+
+    class VerifierCallback extends Callback {
+        private Set<String> mExpectedDeletedApps;
+        private boolean mShouldFail;
+
+        public VerifierCallback(HashSet<String> expectedDeletedApps, boolean shouldFail) {
+            mExpectedDeletedApps = expectedDeletedApps;
+            mShouldFail = shouldFail;
+        }
+
+        @Override
+        public void onSuccess() {
+            System.out.println("lol");
+            assertFalse(mShouldFail);
+            assertEquals(mExpectedDeletedApps, mDeletedApps);
+        }
+
+        @Override
+        public void onError() {
+            assertTrue(mShouldFail);
+        }
+    }
+
+}