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      1 /*
      2  * Copyright 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 androidx.recyclerview.selection;
     18 
     19 import static org.junit.Assert.assertEquals;
     20 import static org.junit.Assert.assertFalse;
     21 import static org.junit.Assert.assertTrue;
     22 
     23 import android.support.test.filters.SmallTest;
     24 import android.support.test.runner.AndroidJUnit4;
     25 
     26 import org.junit.Before;
     27 import org.junit.Test;
     28 import org.junit.runner.RunWith;
     29 
     30 @RunWith(AndroidJUnit4.class)
     31 @SmallTest
     32 public class OperationMonitorTest {
     33 
     34     private OperationMonitor mMonitor;
     35     private TestListener mListener;
     36 
     37     @Before
     38     public void setUp() {
     39         mMonitor = new OperationMonitor();
     40         mListener = new TestListener(mMonitor);
     41     }
     42 
     43     @Test
     44     public void testNotStarted() {
     45         assertFalse(mMonitor.isStarted());
     46     }
     47 
     48     @Test
     49     public void testStarted() {
     50         mMonitor.start();
     51         assertTrue(mMonitor.isStarted());
     52     }
     53 
     54     @Test
     55     public void testStopped() {
     56         mMonitor.start();
     57         mMonitor.stop();
     58         assertFalse(mMonitor.isStarted());
     59     }
     60 
     61     @Test
     62     public void testStartedCallsListener() {
     63         mMonitor.addListener(mListener);
     64         mMonitor.start();
     65         mListener.assertLastState(true);
     66         mMonitor.stop();
     67         mListener.assertLastState(false);
     68     }
     69 
     70     @Test
     71     public void testRemoveListener() {
     72         mMonitor.addListener(mListener);
     73         mMonitor.removeListener(mListener);
     74         mMonitor.start();
     75         mListener.assertLastState(false);
     76     }
     77 
     78     private static final class TestListener implements OperationMonitor.OnChangeListener {
     79 
     80         private boolean mLastState;
     81         private OperationMonitor mMonitor;
     82 
     83         TestListener(OperationMonitor monitor) {
     84             mMonitor = monitor;
     85         }
     86 
     87         @Override
     88         public void onChanged() {
     89             mLastState = mMonitor.isStarted();
     90         }
     91 
     92         void assertLastState(boolean expected) {
     93             assertEquals(expected, mLastState);
     94         }
     95     }
     96 }
     97