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      1 /*
      2  * Copyright (C) 2018 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package android.permission.cts;
     17 
     18 import static org.junit.Assert.fail;
     19 
     20 import org.junit.runner.RunWith;
     21 import org.junit.Test;
     22 
     23 import android.content.pm.PackageInfo;
     24 import android.content.pm.PackageManager;
     25 import android.os.UserHandle;
     26 import android.support.test.InstrumentationRegistry;
     27 import android.support.test.filters.SmallTest;
     28 import android.support.test.runner.AndroidJUnit4;
     29 
     30 import java.util.List;
     31 
     32 /**
     33  * Build, install and run tests with following command:
     34  * atest AppIdleStatePermissionTest
     35  */
     36 @SmallTest
     37 @RunWith(AndroidJUnit4.class)
     38 public class AppIdleStatePermissionTest {
     39 
     40     /**
     41      * Verify that the {@link android.Manifest.permission#CHANGE_APP_IDLE_STATE}
     42      * permission is only held by at most one package.
     43      */
     44     @Test
     45     public void testChangeAppIdleStatePermission() throws Exception {
     46         final PackageManager pm = InstrumentationRegistry.getContext().getPackageManager();
     47         final List<PackageInfo> holding = pm.getPackagesHoldingPermissions(new String[]{
     48                 android.Manifest.permission.CHANGE_APP_IDLE_STATE
     49         }, PackageManager.MATCH_SYSTEM_ONLY);
     50 
     51         int count = 0;
     52         String pkgNames = "";
     53         for (PackageInfo pkg : holding) {
     54             int uid = pm.getApplicationInfo(pkg.packageName, 0).uid;
     55             if (UserHandle.isApp(uid)) {
     56                 pkgNames += pkg.packageName + "\n";
     57                 count++;
     58             }
     59         }
     60         if (count > 1) {
     61             fail("Only one app may hold the CHANGE_APP_IDLE_STATE permission; found packages: \n"
     62                     + pkgNames);
     63         }
     64     }
     65 }