RecyclerViewSmoothScrollerTest.java revision bf134220bd242d4228e78ddd849d2a92ae7dfe4d 
1/*
2 * Copyright 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
17package androidx.recyclerview.widget;
18
19import static org.hamcrest.CoreMatchers.is;
20import static org.hamcrest.MatcherAssert.assertThat;
21import static org.mockito.Mockito.mock;
22import static org.mockito.Mockito.never;
23import static org.mockito.Mockito.spy;
24import static org.mockito.Mockito.verify;
25
26import android.support.test.InstrumentationRegistry;
27import android.support.test.filters.SmallTest;
28import android.support.test.runner.AndroidJUnit4;
29import android.view.View;
30
31import org.junit.Test;
32import org.junit.runner.RunWith;
33
34@RunWith(AndroidJUnit4.class)
35@SmallTest
36public class RecyclerViewSmoothScrollerTest {
37
38    @Test
39    public void stop_whileRunning_isRunningIsFalseInOnStop() {
40        RecyclerView recyclerView = new RecyclerView(InstrumentationRegistry.getContext());
41        RecyclerView.LayoutManager layoutManager = mock(RecyclerView.LayoutManager.class);
42        recyclerView.setLayoutManager(layoutManager);
43        MockSmoothScroller mockSmoothScroller = spy(new MockSmoothScroller());
44        mockSmoothScroller.setTargetPosition(0);
45        mockSmoothScroller.start(recyclerView, layoutManager);
46
47        mockSmoothScroller.stop();
48
49        verify(mockSmoothScroller).onStop();
50        assertThat(mockSmoothScroller.mWasRunningInOnStop, is(false));
51    }
52
53    @Test
54    public void stop_whileNotRunning_doesNotCallOnStop() {
55        RecyclerView.SmoothScroller mockSmoothScroller = spy(new MockSmoothScroller());
56        mockSmoothScroller.stop();
57        verify(mockSmoothScroller, never()).onStop();
58    }
59
60    public static class MockSmoothScroller extends RecyclerView.SmoothScroller {
61
62        boolean mWasRunningInOnStop;
63
64        @Override
65        protected void onStart() {
66
67        }
68
69        @Override
70        protected void onStop() {
71            mWasRunningInOnStop = isRunning();
72        }
73
74        @Override
75        protected void onSeekTargetStep(int dx, int dy, RecyclerView.State state,
76                Action action) {
77
78        }
79
80        @Override
81        protected void onTargetFound(View targetView, RecyclerView.State state,
82                Action action) {
83
84        }
85    }
86
87}
88