1/* 2 * Copyright (C) 2007 The Guava Authors 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 com.google.common.collect.testing.testers; 18 19import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES; 20import static com.google.common.collect.testing.features.CollectionFeature.FAILS_FAST_ON_CONCURRENT_MODIFICATION; 21import static com.google.common.collect.testing.features.CollectionFeature.RESTRICTS_ELEMENTS; 22import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_ADD; 23import static com.google.common.collect.testing.features.CollectionSize.ZERO; 24 25import com.google.common.annotations.GwtCompatible; 26import com.google.common.collect.testing.AbstractCollectionTester; 27import com.google.common.collect.testing.features.CollectionFeature; 28import com.google.common.collect.testing.features.CollectionSize; 29 30import java.util.ConcurrentModificationException; 31import java.util.Iterator; 32 33/** 34 * A generic JUnit test which tests {@code add} operations on a collection. 35 * Can't be invoked directly; please see 36 * {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}. 37 * 38 * @author Chris Povirk 39 * @author Kevin Bourrillion 40 */ 41@SuppressWarnings("unchecked") // too many "unchecked generic array creations" 42@GwtCompatible(emulated = true) 43public class CollectionAddTester<E> extends AbstractCollectionTester<E> { 44 @CollectionFeature.Require(SUPPORTS_ADD) 45 public void testAdd_supportedNotPresent() { 46 assertTrue("add(notPresent) should return true", 47 collection.add(samples.e3)); 48 expectAdded(samples.e3); 49 } 50 51 @CollectionFeature.Require(absent = SUPPORTS_ADD) 52 public void testAdd_unsupportedNotPresent() { 53 try { 54 collection.add(samples.e3); 55 fail("add(notPresent) should throw"); 56 } catch (UnsupportedOperationException expected) { 57 } 58 expectUnchanged(); 59 expectMissing(samples.e3); 60 } 61 62 @CollectionFeature.Require(absent = SUPPORTS_ADD) 63 @CollectionSize.Require(absent = ZERO) 64 public void testAdd_unsupportedPresent() { 65 try { 66 assertFalse("add(present) should return false or throw", 67 collection.add(samples.e0)); 68 } catch (UnsupportedOperationException tolerated) { 69 } 70 expectUnchanged(); 71 } 72 73 @CollectionFeature.Require( 74 value = {SUPPORTS_ADD, ALLOWS_NULL_VALUES}, 75 absent = RESTRICTS_ELEMENTS) 76 public void testAdd_nullSupported() { 77 assertTrue("add(null) should return true", collection.add(null)); 78 expectAdded((E) null); 79 } 80 81 @CollectionFeature.Require(value = SUPPORTS_ADD, 82 absent = ALLOWS_NULL_VALUES) 83 public void testAdd_nullUnsupported() { 84 try { 85 collection.add(null); 86 fail("add(null) should throw"); 87 } catch (NullPointerException expected) { 88 } 89 expectUnchanged(); 90 expectNullMissingWhenNullUnsupported( 91 "Should not contain null after unsupported add(null)"); 92 } 93 94 @CollectionFeature.Require({SUPPORTS_ADD, 95 FAILS_FAST_ON_CONCURRENT_MODIFICATION}) 96 @CollectionSize.Require(absent = ZERO) 97 public void testAddConcurrentWithIteration() { 98 try { 99 Iterator<E> iterator = collection.iterator(); 100 assertTrue(collection.add(samples.e3)); 101 iterator.next(); 102 fail("Expected ConcurrentModificationException"); 103 } catch (ConcurrentModificationException expected) { 104 // success 105 } 106 } 107} 108 109