1 /*
2  * Copyright (C) 2020 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 
17 package com.android.frameworks.inprocesstests;
18 
19 import static com.google.common.truth.Truth.assertThat;
20 
21 import android.os.Process;
22 
23 import androidx.test.platform.app.InstrumentationRegistry;
24 
25 import org.junit.Test;
26 
27 import java.io.BufferedReader;
28 import java.io.FileReader;
29 
30 public class InstrumentSystemServerTest {
31 
32     private static final String TAG = "InstrumentSystemServerTest";
33 
34     @Test
testCodeIsRunningInSystemServer()35     public void testCodeIsRunningInSystemServer() throws Exception {
36         assertThat(InstrumentationRegistry.getInstrumentation().getTargetContext().getPackageName())
37                 .isEqualTo("android");
38         assertThat(Process.myUid()).isEqualTo(Process.SYSTEM_UID);
39         assertThat(readCmdLine()).isEqualTo("system_server");
40     }
41 
readCmdLine()42     private static String readCmdLine() throws Exception {
43         BufferedReader in = null;
44         try {
45             in = new BufferedReader(new FileReader("/proc/self/cmdline"));
46             return in.readLine().trim();
47         } finally {
48             in.close();
49         }
50     }
51 
52 }
53