1 /* 2 * Copyright (C) 2015 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 17 package com.google.common.collect.testing.testers; 18 19 import static com.google.common.collect.testing.features.CollectionFeature.FAILS_FAST_ON_CONCURRENT_MODIFICATION; 20 import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_ITERATOR_REMOVE; 21 import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_REMOVE; 22 import static com.google.common.collect.testing.features.CollectionSize.SEVERAL; 23 import static com.google.common.collect.testing.features.CollectionSize.ZERO; 24 25 import com.google.common.annotations.GwtCompatible; 26 import com.google.common.collect.testing.AbstractCollectionTester; 27 import com.google.common.collect.testing.features.CollectionFeature; 28 import com.google.common.collect.testing.features.CollectionSize; 29 import java.util.Collection; 30 import java.util.ConcurrentModificationException; 31 import java.util.Iterator; 32 import java.util.function.Predicate; 33 import org.junit.Ignore; 34 35 /** 36 * A generic JUnit test which tests {@link Collection#removeIf}. Can't be invoked directly; please 37 * see {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}. 38 * 39 * @author Louis Wasserman 40 */ 41 @GwtCompatible 42 @SuppressWarnings("unchecked") // too many "unchecked generic array creations" 43 @Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests. 44 public class CollectionRemoveIfTester<E> extends AbstractCollectionTester<E> { 45 @CollectionFeature.Require(SUPPORTS_ITERATOR_REMOVE) testRemoveIf_alwaysFalse()46 public void testRemoveIf_alwaysFalse() { 47 assertFalse("removeIf(x -> false) should return false", collection.removeIf(x -> false)); 48 expectUnchanged(); 49 } 50 51 @CollectionFeature.Require(SUPPORTS_ITERATOR_REMOVE) 52 @CollectionSize.Require(absent = ZERO) testRemoveIf_sometimesTrue()53 public void testRemoveIf_sometimesTrue() { 54 assertTrue( 55 "removeIf(isEqual(present)) should return true", 56 collection.removeIf(Predicate.isEqual(samples.e0()))); 57 expectMissing(samples.e0()); 58 } 59 60 @CollectionFeature.Require(SUPPORTS_ITERATOR_REMOVE) 61 @CollectionSize.Require(absent = ZERO) testRemoveIf_allPresent()62 public void testRemoveIf_allPresent() { 63 assertTrue("removeIf(x -> true) should return true", collection.removeIf(x -> true)); 64 expectContents(); 65 } 66 67 @CollectionFeature.Require({SUPPORTS_ITERATOR_REMOVE, FAILS_FAST_ON_CONCURRENT_MODIFICATION}) 68 @CollectionSize.Require(SEVERAL) testRemoveIfSomeMatchesConcurrentWithIteration()69 public void testRemoveIfSomeMatchesConcurrentWithIteration() { 70 try { 71 Iterator<E> iterator = collection.iterator(); 72 assertTrue(collection.removeIf(Predicate.isEqual(samples.e0()))); 73 iterator.next(); 74 fail("Expected ConcurrentModificationException"); 75 } catch (ConcurrentModificationException expected) { 76 // success 77 } 78 } 79 80 @CollectionFeature.Require(absent = SUPPORTS_REMOVE) 81 @CollectionSize.Require(ZERO) testRemoveIf_unsupportedEmptyCollection()82 public void testRemoveIf_unsupportedEmptyCollection() { 83 try { 84 assertFalse( 85 "removeIf(Predicate) should return false or throw " + "UnsupportedOperationException", 86 collection.removeIf( 87 x -> { 88 throw new AssertionError("predicate should never be called"); 89 })); 90 } catch (UnsupportedOperationException tolerated) { 91 } 92 expectUnchanged(); 93 } 94 95 @CollectionFeature.Require(absent = SUPPORTS_REMOVE) 96 @CollectionSize.Require(absent = ZERO) testRemoveIf_alwaysTrueUnsupported()97 public void testRemoveIf_alwaysTrueUnsupported() { 98 try { 99 collection.removeIf(x -> true); 100 fail("removeIf(x -> true) should throw " + "UnsupportedOperationException"); 101 } catch (UnsupportedOperationException expected) { 102 } 103 expectUnchanged(); 104 assertTrue(collection.contains(samples.e0())); 105 } 106 } 107