1 /*
2  * Copyright (C) 2017 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.documentsui.prefs;
18 
19 import android.content.SharedPreferences;
20 
21 import androidx.test.InstrumentationRegistry;
22 import androidx.test.filters.SmallTest;
23 import androidx.test.runner.AndroidJUnit4;
24 
25 import com.android.documentsui.testing.TestConsumer;
26 
27 import org.junit.After;
28 import org.junit.Before;
29 import org.junit.Test;
30 import org.junit.runner.RunWith;
31 
32 import java.util.concurrent.TimeUnit;
33 
34 @RunWith(AndroidJUnit4.class)
35 @SmallTest
36 public class PreferencesMonitorTest {
37 
38     private static final String LOCAL_PREFERENCE = "rootViewMode-testRoot";
39 
40     private SharedPreferences mPrefs;
41     private PreferencesMonitor mMonitor;
42     private TestConsumer<String> mConsumer;
43 
44     @Before
setUp()45     public void setUp() {
46         mConsumer = new TestConsumer<>();
47         mPrefs = InstrumentationRegistry.getContext().getSharedPreferences("MonitorTest0", 0);
48         mMonitor = new PreferencesMonitor("Poodles", mPrefs, mConsumer);
49         mMonitor.start();
50     }
51 
52     @After
tearDown()53     public void tearDown() {
54         mMonitor.stop();
55     }
56 
57     @Test
testReportsChangesToListener()58     public void testReportsChangesToListener() throws Exception {
59         mPrefs.edit().putInt(LOCAL_PREFERENCE, 1).apply();
60         // internally the monitor waits for notification of changes.
61         mConsumer.waitForCall(100, TimeUnit.MILLISECONDS);
62         mConsumer.assertLastArgument(LOCAL_PREFERENCE);
63     }
64 }
65