1 /* 2 * Copyright (C) 2008 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.CollectionSize.SEVERAL; 20 import static com.google.common.collect.testing.features.CollectionSize.ZERO; 21 import static com.google.common.collect.testing.features.MapFeature.FAILS_FAST_ON_CONCURRENT_MODIFICATION; 22 import static com.google.common.collect.testing.features.MapFeature.SUPPORTS_REMOVE; 23 24 import com.google.common.annotations.GwtCompatible; 25 import com.google.common.collect.testing.AbstractMapTester; 26 import com.google.common.collect.testing.features.CollectionSize; 27 import com.google.common.collect.testing.features.MapFeature; 28 import java.util.ConcurrentModificationException; 29 import java.util.Iterator; 30 import java.util.Map.Entry; 31 import org.junit.Ignore; 32 33 /** 34 * A generic JUnit test which tests {@code clear()} operations on a map. Can't be invoked directly; 35 * please see {@link com.google.common.collect.testing.MapTestSuiteBuilder}. 36 * 37 * @author George van den Driessche 38 * @author Chris Povirk 39 */ 40 @GwtCompatible 41 @Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests. 42 public class MapClearTester<K, V> extends AbstractMapTester<K, V> { 43 @MapFeature.Require(SUPPORTS_REMOVE) testClear()44 public void testClear() { 45 getMap().clear(); 46 assertTrue("After clear(), a map should be empty.", getMap().isEmpty()); 47 assertEquals(0, getMap().size()); 48 assertFalse(getMap().entrySet().iterator().hasNext()); 49 } 50 51 @MapFeature.Require({FAILS_FAST_ON_CONCURRENT_MODIFICATION, SUPPORTS_REMOVE}) 52 @CollectionSize.Require(SEVERAL) testClearConcurrentWithEntrySetIteration()53 public void testClearConcurrentWithEntrySetIteration() { 54 try { 55 Iterator<Entry<K, V>> iterator = getMap().entrySet().iterator(); 56 getMap().clear(); 57 iterator.next(); 58 fail("Expected ConcurrentModificationException"); 59 } catch (ConcurrentModificationException expected) { 60 // success 61 } 62 } 63 64 @MapFeature.Require({FAILS_FAST_ON_CONCURRENT_MODIFICATION, SUPPORTS_REMOVE}) 65 @CollectionSize.Require(SEVERAL) testClearConcurrentWithKeySetIteration()66 public void testClearConcurrentWithKeySetIteration() { 67 try { 68 Iterator<K> iterator = getMap().keySet().iterator(); 69 getMap().clear(); 70 iterator.next(); 71 fail("Expected ConcurrentModificationException"); 72 } catch (ConcurrentModificationException expected) { 73 // success 74 } 75 } 76 77 @MapFeature.Require({FAILS_FAST_ON_CONCURRENT_MODIFICATION, SUPPORTS_REMOVE}) 78 @CollectionSize.Require(SEVERAL) testClearConcurrentWithValuesIteration()79 public void testClearConcurrentWithValuesIteration() { 80 try { 81 Iterator<V> iterator = getMap().values().iterator(); 82 getMap().clear(); 83 iterator.next(); 84 fail("Expected ConcurrentModificationException"); 85 } catch (ConcurrentModificationException expected) { 86 // success 87 } 88 } 89 90 @MapFeature.Require(absent = SUPPORTS_REMOVE) 91 @CollectionSize.Require(absent = ZERO) testClear_unsupported()92 public void testClear_unsupported() { 93 try { 94 getMap().clear(); 95 fail( 96 "clear() should throw UnsupportedOperation if a map does " 97 + "not support it and is not empty."); 98 } catch (UnsupportedOperationException expected) { 99 } 100 expectUnchanged(); 101 } 102 103 @MapFeature.Require(absent = SUPPORTS_REMOVE) 104 @CollectionSize.Require(ZERO) testClear_unsupportedByEmptyCollection()105 public void testClear_unsupportedByEmptyCollection() { 106 try { 107 getMap().clear(); 108 } catch (UnsupportedOperationException tolerated) { 109 } 110 expectUnchanged(); 111 } 112 } 113