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.google; 18 19 import static com.google.common.collect.testing.features.CollectionSize.ONE; 20 import static com.google.common.collect.testing.features.CollectionSize.SEVERAL; 21 import static com.google.common.collect.testing.features.CollectionSize.ZERO; 22 23 import com.google.common.annotations.GwtCompatible; 24 import com.google.common.collect.HashMultiset; 25 import com.google.common.collect.Multiset; 26 import com.google.common.collect.Multisets; 27 import com.google.common.collect.testing.WrongType; 28 import com.google.common.collect.testing.features.CollectionSize; 29 30 import java.lang.reflect.Method; 31 import java.util.Arrays; 32 import java.util.List; 33 34 /** 35 * A generic JUnit test which tests multiset-specific read operations. 36 * Can't be invoked directly; please see 37 * {@link com.google.common.collect.testing.SetTestSuiteBuilder}. 38 * 39 * @author Jared Levy 40 */ 41 @GwtCompatible 42 public class MultisetReadsTester<E> extends AbstractMultisetTester<E> { testCount_0()43 public void testCount_0() { 44 assertEquals("multiset.count(missing) didn't return 0", 45 0, getMultiset().count(samples.e3)); 46 } 47 48 @CollectionSize.Require(absent = ZERO) testCount_1()49 public void testCount_1() { 50 assertEquals("multiset.count(present) didn't return 1", 51 1, getMultiset().count(samples.e0)); 52 } 53 54 @CollectionSize.Require(SEVERAL) testCount_3()55 public void testCount_3() { 56 initThreeCopies(); 57 assertEquals("multiset.count(thriceContained) didn't return 3", 58 3, getMultiset().count(samples.e0)); 59 } 60 testCount_null()61 public void testCount_null() { 62 assertEquals("multiset.count(null) didn't return 0", 63 0, getMultiset().count(null)); 64 } 65 testCount_wrongType()66 public void testCount_wrongType() { 67 assertEquals("multiset.count(wrongType) didn't return 0", 68 0, getMultiset().count(WrongType.VALUE)); 69 } 70 71 @CollectionSize.Require(absent = ZERO) testElementSet_contains()72 public void testElementSet_contains() { 73 assertTrue("multiset.elementSet().contains(present) returned false", 74 getMultiset().elementSet().contains(samples.e0)); 75 } 76 77 @CollectionSize.Require(absent = ZERO) testEntrySet_contains()78 public void testEntrySet_contains() { 79 assertTrue("multiset.entrySet() didn't contain [present, 1]", 80 getMultiset().entrySet().contains( 81 Multisets.immutableEntry(samples.e0, 1))); 82 } 83 testEntrySet_contains_count0()84 public void testEntrySet_contains_count0() { 85 assertFalse("multiset.entrySet() contains [missing, 0]", 86 getMultiset().entrySet().contains( 87 Multisets.immutableEntry(samples.e3, 0))); 88 } 89 testEntrySet_contains_nonentry()90 public void testEntrySet_contains_nonentry() { 91 assertFalse("multiset.entrySet() contains a non-entry", 92 getMultiset().entrySet().contains(samples.e0)); 93 } 94 testEntrySet_twice()95 public void testEntrySet_twice() { 96 assertEquals("calling multiset.entrySet() twice returned unequal sets", 97 getMultiset().entrySet(), getMultiset().entrySet()); 98 } 99 100 @CollectionSize.Require(ZERO) testEntrySet_hashCode_size0()101 public void testEntrySet_hashCode_size0() { 102 assertEquals("multiset.entrySet() has incorrect hash code", 103 0, getMultiset().entrySet().hashCode()); 104 } 105 106 @CollectionSize.Require(ONE) testEntrySet_hashCode_size1()107 public void testEntrySet_hashCode_size1() { 108 assertEquals("multiset.entrySet() has incorrect hash code", 109 1 ^ samples.e0.hashCode(), getMultiset().entrySet().hashCode()); 110 } 111 testEquals_yes()112 public void testEquals_yes() { 113 assertTrue("multiset doesn't equal a multiset with the same elements", 114 getMultiset().equals(HashMultiset.create(getSampleElements()))); 115 } 116 testEquals_differentSize()117 public void testEquals_differentSize() { 118 Multiset<E> other = HashMultiset.create(getSampleElements()); 119 other.add(samples.e0); 120 assertFalse("multiset equals a multiset with a different size", 121 getMultiset().equals(other)); 122 } 123 124 @CollectionSize.Require(absent = ZERO) testEquals_differentElements()125 public void testEquals_differentElements() { 126 Multiset<E> other = HashMultiset.create(getSampleElements()); 127 other.remove(samples.e0); 128 other.add(samples.e3); 129 assertFalse("multiset equals a multiset with different elements", 130 getMultiset().equals(other)); 131 } 132 133 @CollectionSize.Require(ZERO) testHashCode_size0()134 public void testHashCode_size0() { 135 assertEquals("multiset has incorrect hash code", 136 0, getMultiset().hashCode()); 137 } 138 139 @CollectionSize.Require(ONE) testHashCode_size1()140 public void testHashCode_size1() { 141 assertEquals("multiset has incorrect hash code", 142 1 ^ samples.e0.hashCode(), getMultiset().hashCode()); 143 } 144 145 /** 146 * Returns {@link Method} instances for the read tests that assume multisets 147 * support duplicates so that the test of {@code Multisets.forSet()} can 148 * suppress them. 149 */ getReadsDuplicateInitializingMethods()150 public static List<Method> getReadsDuplicateInitializingMethods() { 151 return Arrays.asList( 152 Platform.getMethod(MultisetReadsTester.class, "testCount_3")); 153 } 154 } 155