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 */
16package androidx.work.impl.constraints.trackers;
17
18import static org.hamcrest.MatcherAssert.assertThat;
19import static org.hamcrest.Matchers.is;
20import static org.mockito.Mockito.mock;
21import static org.mockito.Mockito.verify;
22import static org.mockito.Mockito.verifyNoMoreInteractions;
23import static org.mockito.Mockito.when;
24
25import android.content.Context;
26import android.support.test.filters.SmallTest;
27import android.support.test.runner.AndroidJUnit4;
28
29import androidx.work.impl.constraints.ConstraintListener;
30
31import org.junit.After;
32import org.junit.Before;
33import org.junit.Test;
34import org.junit.runner.RunWith;
35
36@SmallTest
37@RunWith(AndroidJUnit4.class)
38public class ConstraintTrackerTest {
39
40    private TestConstraintTracker mTracker;
41    private Context mMockContext;
42
43    @Before
44    public void setUp() {
45        mMockContext = mock(Context.class);
46        when(mMockContext.getApplicationContext()).thenReturn(mMockContext);
47        mTracker = new TestConstraintTracker(mMockContext);
48    }
49
50    @After
51    public void tearDown() {
52        try {
53            mTracker.stopTracking();
54        } catch (IllegalArgumentException e) {
55            // Ignore any exceptions if the receiver isn't registered.
56        }
57    }
58
59    @Test
60    public void testAddListener_manyListeners_doesNotCallGetInitialStateAndStartTrackingTwice() {
61        ConstraintListener<Boolean> constraintListener1 = mock(ConstraintListener.class);
62        ConstraintListener<Boolean> constraintListener2 = mock(ConstraintListener.class);
63
64        assertThat(mTracker.mIsTracking, is(false));
65        assertThat(mTracker.mStartTrackingCount, is(0));
66        assertThat(mTracker.mGetInitialStateCount, is(0));
67
68        mTracker.addListener(constraintListener1);
69        assertThat(mTracker.mIsTracking, is(true));
70        assertThat(mTracker.mStartTrackingCount, is(1));
71        assertThat(mTracker.mGetInitialStateCount, is(1));
72
73        mTracker.addListener(constraintListener2);
74        assertThat(mTracker.mIsTracking, is(true));
75        assertThat(mTracker.mStartTrackingCount, is(1));
76        assertThat(mTracker.mGetInitialStateCount, is(1));
77    }
78
79    @Test
80    public void testAddListener_sameListener_doesNotCallGetInitialStateAndStartTrackingTwice() {
81        ConstraintListener<Boolean> constraintListener = mock(ConstraintListener.class);
82
83        assertThat(mTracker.mIsTracking, is(false));
84        assertThat(mTracker.mStartTrackingCount, is(0));
85        assertThat(mTracker.mGetInitialStateCount, is(0));
86
87        mTracker.addListener(constraintListener);
88        assertThat(mTracker.mIsTracking, is(true));
89        assertThat(mTracker.mStartTrackingCount, is(1));
90        assertThat(mTracker.mGetInitialStateCount, is(1));
91
92        mTracker.addListener(constraintListener);
93        assertThat(mTracker.mIsTracking, is(true));
94        assertThat(mTracker.mStartTrackingCount, is(1));
95        assertThat(mTracker.mGetInitialStateCount, is(1));
96    }
97
98    @Test
99    public void testAddListener_notifiesAddedListener() {
100        ConstraintListener<Boolean> constraintListener1 = mock(ConstraintListener.class);
101        ConstraintListener<Boolean> constraintListener2 = mock(ConstraintListener.class);
102
103        mTracker.mInitialState = true;
104        mTracker.addListener(constraintListener1);
105        verify(constraintListener1).onConstraintChanged(true);
106
107        mTracker.addListener(constraintListener2);
108        verify(constraintListener2).onConstraintChanged(true);
109        verifyNoMoreInteractions(constraintListener1);
110    }
111
112    @Test
113    public void testAddListener_constraintNotSet() {
114        ConstraintListener<Boolean> constraintListener1 = mock(ConstraintListener.class);
115        ConstraintListener<Boolean> constraintListener2 = mock(ConstraintListener.class);
116
117        mTracker.addListener(constraintListener1);
118        mTracker.addListener(constraintListener2);
119        verify(constraintListener1).onConstraintChanged(null);
120        verify(constraintListener2).onConstraintChanged(null);
121    }
122
123    @Test
124    public void testSetState_newState_notifiesAllListeners() {
125        ConstraintListener<Boolean> constraintListener1 = mock(ConstraintListener.class);
126        ConstraintListener<Boolean> constraintListener2 = mock(ConstraintListener.class);
127
128        mTracker.addListener(constraintListener1);
129        mTracker.addListener(constraintListener2);
130        verify(constraintListener1).onConstraintChanged(null);
131        verify(constraintListener2).onConstraintChanged(null);
132
133        mTracker.setState(true);
134        verify(constraintListener1).onConstraintChanged(true);
135        verify(constraintListener2).onConstraintChanged(true);
136    }
137
138    @Test
139    public void testSetState_sameState_doesNotNotify() {
140        ConstraintListener<Boolean> constraintListener1 = mock(ConstraintListener.class);
141        ConstraintListener<Boolean> constraintListener2 = mock(ConstraintListener.class);
142
143        mTracker.addListener(constraintListener1);
144        mTracker.addListener(constraintListener2);
145        verify(constraintListener1).onConstraintChanged(null);
146        verify(constraintListener2).onConstraintChanged(null);
147
148        mTracker.setState(false);
149        verify(constraintListener1).onConstraintChanged(false);
150        verify(constraintListener2).onConstraintChanged(false);
151
152        mTracker.setState(false);
153        verifyNoMoreInteractions(constraintListener1);
154        verifyNoMoreInteractions(constraintListener2);
155    }
156
157    @Test
158    public void testRemoveListener() {
159        ConstraintListener<Boolean> constraintListener1 = mock(ConstraintListener.class);
160        ConstraintListener<Boolean> constraintListener2 = mock(ConstraintListener.class);
161
162        mTracker.addListener(constraintListener1);
163        mTracker.addListener(constraintListener2);
164
165        mTracker.removeListener(constraintListener1);
166        assertThat(mTracker.mIsTracking, is(true));
167        assertThat(mTracker.mStopTrackingCount, is(0));
168
169        mTracker.removeListener(constraintListener2);
170        assertThat(mTracker.mIsTracking, is(false));
171        assertThat(mTracker.mStopTrackingCount, is(1));
172    }
173
174    private static class TestConstraintTracker extends ConstraintTracker<Boolean> {
175        boolean mIsTracking;
176        int mGetInitialStateCount;
177        int mStartTrackingCount;
178        int mStopTrackingCount;
179        Boolean mInitialState = null;
180
181        TestConstraintTracker(Context context) {
182            super(context);
183        }
184
185        @Override
186        public Boolean getInitialState() {
187            mGetInitialStateCount++;
188            return mInitialState;
189        }
190
191        @Override
192        public void startTracking() {
193            mIsTracking = true;
194            mStartTrackingCount++;
195        }
196
197        @Override
198        public void stopTracking() {
199            mIsTracking = false;
200            mStopTrackingCount++;
201        }
202    }
203}
204