1 /* 2 * Copyright (C) 2014 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.inputmethod.latin.utils; 18 19 import static org.junit.Assert.assertEquals; 20 import static org.junit.Assert.assertFalse; 21 import static org.junit.Assert.assertTrue; 22 import static org.junit.Assert.fail; 23 24 import androidx.test.filters.SmallTest; 25 import androidx.test.runner.AndroidJUnit4; 26 27 import com.android.inputmethod.latin.common.CollectionUtils; 28 29 import org.junit.Test; 30 import org.junit.runner.RunWith; 31 32 import java.util.ArrayList; 33 import java.util.Arrays; 34 import java.util.Collections; 35 import java.util.HashMap; 36 import java.util.List; 37 import java.util.Map; 38 39 /** 40 * Tests for {@link CollectionUtils}. 41 */ 42 @SmallTest 43 @RunWith(AndroidJUnit4.class) 44 public class CollectionUtilsTests { 45 /** 46 * Tests that {@link CollectionUtils#arrayAsList(Object[],int,int)} fails as expected 47 * with some invalid inputs. 48 */ 49 @Test testArrayAsListFailure()50 public void testArrayAsListFailure() { 51 final String[] array = { "0", "1" }; 52 // Negative start 53 try { 54 CollectionUtils.arrayAsList(array, -1, 1); 55 fail("Failed to catch start < 0"); 56 } catch (final IllegalArgumentException e) { 57 assertEquals("Invalid start: -1 end: 1 with array.length: 2", e.getMessage()); 58 } 59 // start > end 60 try { 61 CollectionUtils.arrayAsList(array, 1, -1); 62 fail("Failed to catch start > end"); 63 } catch (final IllegalArgumentException e) { 64 assertEquals("Invalid start: 1 end: -1 with array.length: 2", e.getMessage()); 65 } 66 // end > array.length 67 try { 68 CollectionUtils.arrayAsList(array, 1, 3); 69 fail("Failed to catch end > array.length"); 70 } catch (final IllegalArgumentException e) { 71 assertEquals("Invalid start: 1 end: 3 with array.length: 2", e.getMessage()); 72 } 73 } 74 75 /** 76 * Tests that {@link CollectionUtils#arrayAsList(Object[],int,int)} gives the expected 77 * results for a few valid inputs. 78 */ 79 @Test testArrayAsList()80 public void testArrayAsList() { 81 final ArrayList<String> empty = new ArrayList<>(); 82 assertEquals(empty, CollectionUtils.arrayAsList(new String[] {}, 0, 0)); 83 final String[] array = { "0", "1", "2", "3", "4" }; 84 assertEquals(empty, CollectionUtils.arrayAsList(array, 0, 0)); 85 assertEquals(empty, CollectionUtils.arrayAsList(array, 1, 1)); 86 assertEquals(empty, CollectionUtils.arrayAsList(array, array.length, array.length)); 87 final ArrayList<String> expected123 = new ArrayList<>(Arrays.asList("1", "2", "3")); 88 assertEquals(expected123, CollectionUtils.arrayAsList(array, 1, 4)); 89 } 90 91 /** 92 * Tests that {@link CollectionUtils#isNullOrEmpty(java.util.Collection)} gives the expected 93 * results for a few cases. 94 */ 95 @Test testIsNullOrEmpty()96 public void testIsNullOrEmpty() { 97 assertTrue(CollectionUtils.isNullOrEmpty((List<String>) null)); 98 assertTrue(CollectionUtils.isNullOrEmpty((Map<String, String>) null)); 99 assertTrue(CollectionUtils.isNullOrEmpty(new ArrayList<String>())); 100 assertTrue(CollectionUtils.isNullOrEmpty(new HashMap<String, String>())); 101 assertFalse(CollectionUtils.isNullOrEmpty(Collections.singletonList("Not empty"))); 102 assertFalse(CollectionUtils.isNullOrEmpty(Collections.singletonMap("Not", "empty"))); 103 } 104 } 105