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 androidx.room.integration.testapp.paging; 18 19 import static junit.framework.Assert.assertFalse; 20 21 import static org.hamcrest.CoreMatchers.is; 22 import static org.hamcrest.MatcherAssert.assertThat; 23 24 import android.support.test.filters.SmallTest; 25 import android.support.test.runner.AndroidJUnit4; 26 27 import androidx.annotation.NonNull; 28 import androidx.room.integration.testapp.test.TestDatabaseTest; 29 import androidx.room.integration.testapp.test.TestUtil; 30 import androidx.room.integration.testapp.vo.User; 31 import androidx.room.paging.LimitOffsetDataSource; 32 33 import org.junit.After; 34 import org.junit.Test; 35 import org.junit.runner.RunWith; 36 37 import java.util.ArrayList; 38 import java.util.List; 39 40 @SmallTest 41 @RunWith(AndroidJUnit4.class) 42 public class LimitOffsetDataSourceTest extends TestDatabaseTest { 43 44 @After 45 public void teardown() { 46 mUserDao.deleteEverything(); 47 } 48 49 private LimitOffsetDataSource<User> loadUsersByAgeDesc() { 50 return (LimitOffsetDataSource<User>) mUserDao.loadUsersByAgeDesc().create(); 51 } 52 53 @Test 54 public void emptyPage() { 55 LimitOffsetDataSource<User> dataSource = loadUsersByAgeDesc(); 56 assertThat(dataSource.countItems(), is(0)); 57 } 58 59 @Test 60 public void loadCount() { 61 createUsers(6); 62 LimitOffsetDataSource<User> dataSource = loadUsersByAgeDesc(); 63 assertThat(dataSource.countItems(), is(6)); 64 } 65 66 @Test 67 public void singleItem() { 68 List<User> users = createUsers(1); 69 LimitOffsetDataSource<User> dataSource = loadUsersByAgeDesc(); 70 assertThat(dataSource.countItems(), is(1)); 71 List<User> initial = dataSource.loadRange(0, 10); 72 73 assertThat(initial.get(0), is(users.get(0))); 74 assertFalse(dataSource.loadRange(1, 10).iterator().hasNext()); 75 } 76 77 @Test 78 public void initial() { 79 List<User> users = createUsers(10); 80 LimitOffsetDataSource<User> dataSource = loadUsersByAgeDesc(); 81 assertThat(dataSource.countItems(), is(10)); 82 List<User> initial = dataSource.loadRange(0, 1); 83 assertThat(initial.get(0), is(users.get(0))); 84 List<User> second = dataSource.loadRange(1, 1); 85 assertThat(second.get(0), is(users.get(1))); 86 } 87 88 @Test 89 public void loadAll() { 90 List<User> users = createUsers(10); 91 92 LimitOffsetDataSource<User> dataSource = loadUsersByAgeDesc(); 93 List<User> all = dataSource.loadRange(0, 10); 94 assertThat(users, is(all)); 95 } 96 97 @Test 98 public void loadAfter() { 99 List<User> users = createUsers(10); 100 LimitOffsetDataSource<User> dataSource = loadUsersByAgeDesc(); 101 List<User> result = dataSource.loadRange(4, 2); 102 assertThat(result, is(users.subList(4, 6))); 103 } 104 105 @NonNull 106 private List<User> createUsers(int count) { 107 List<User> users = new ArrayList<>(); 108 for (int i = 0; i < count; i++) { 109 User user = TestUtil.createUser(i); 110 user.setAge(1); 111 mUserDao.insert(user); 112 users.add(user); 113 } 114 return users; 115 } 116 } 117
