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17 package com.google.common.collect.testing.google;
18
19 import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_QUERIES;
20 import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES;
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 import static com.google.common.truth.Truth.assertThat;
25
26 import com.google.common.annotations.GwtCompatible;
27 import com.google.common.collect.testing.Helpers;
28 import com.google.common.collect.testing.WrongType;
29 import com.google.common.collect.testing.features.CollectionFeature;
30 import com.google.common.collect.testing.features.CollectionSize;
31
32 import java.util.Collections;
33 import java.util.List;
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40
41 @GwtCompatible(emulated = true)
42 public class MultisetRemoveTester<E> extends AbstractMultisetTester<E> {
43 @CollectionFeature.Require(SUPPORTS_REMOVE)
44 public void testRemoveNegative() {
45 try {
46 getMultiset().remove(samples.e0, -1);
47 fail("Expected IllegalArgumentException");
48 } catch (IllegalArgumentException expected) {}
49 expectUnchanged();
50 }
51
52 @CollectionFeature.Require(absent = SUPPORTS_REMOVE)
53 public void testRemoveUnsupported() {
54 try {
55 getMultiset().remove(samples.e0, 2);
56 fail("Expected UnsupportedOperationException");
57 } catch (UnsupportedOperationException expected) {}
58 }
59
60 @CollectionFeature.Require(SUPPORTS_REMOVE)
61 public void testRemoveZeroNoOp() {
62 int originalCount = getMultiset().count(samples.e0);
63 assertEquals("old count", originalCount, getMultiset().remove(samples.e0, 0));
64 expectUnchanged();
65 }
66
67 @CollectionSize.Require(absent = ZERO)
68 @CollectionFeature.Require(SUPPORTS_REMOVE)
69 public void testRemove_occurrences_present() {
70 assertEquals("multiset.remove(present, 2) didn't return the old count",
71 1, getMultiset().remove(samples.e0, 2));
72 assertFalse("multiset contains present after multiset.remove(present, 2)",
73 getMultiset().contains(samples.e0));
74 assertEquals(0, getMultiset().count(samples.e0));
75 }
76
77 @CollectionSize.Require(SEVERAL)
78 @CollectionFeature.Require(SUPPORTS_REMOVE)
79 public void testRemove_some_occurrences_present() {
80 initThreeCopies();
81 assertEquals("multiset.remove(present, 2) didn't return the old count",
82 3, getMultiset().remove(samples.e0, 2));
83 assertTrue("multiset contains present after multiset.remove(present, 2)",
84 getMultiset().contains(samples.e0));
85 assertEquals(1, getMultiset().count(samples.e0));
86 }
87
88 @CollectionFeature.Require(SUPPORTS_REMOVE)
89 public void testRemove_occurrences_absent() {
90 assertEquals("multiset.remove(absent, 0) didn't return 0",
91 0, getMultiset().remove(samples.e3, 2));
92 }
93
94 @CollectionFeature.Require(absent = SUPPORTS_REMOVE)
95 public void testRemove_occurrences_unsupported_absent() {
96
97 try {
98 assertEquals(
99 "multiset.remove(absent, 2) didn't return 0 or throw an exception",
100 0, getMultiset().remove(samples.e3, 2));
101 } catch (UnsupportedOperationException ok) {}
102 }
103
104 @CollectionFeature.Require(SUPPORTS_REMOVE)
105 public void testRemove_occurrences_0() {
106 int oldCount = getMultiset().count(samples.e0);
107 assertEquals("multiset.remove(E, 0) didn't return the old count",
108 oldCount, getMultiset().remove(samples.e0, 0));
109 }
110
111 @CollectionFeature.Require(SUPPORTS_REMOVE)
112 public void testRemove_occurrences_negative() {
113 try {
114 getMultiset().remove(samples.e0, -1);
115 fail("multiset.remove(E, -1) didn't throw an exception");
116 } catch (IllegalArgumentException required) {}
117 }
118
119 @CollectionFeature.Require(SUPPORTS_REMOVE)
120 public void testRemove_occurrences_wrongType() {
121 assertEquals("multiset.remove(wrongType, 1) didn't return 0",
122 0, getMultiset().remove(WrongType.VALUE, 1));
123 }
124
125 @CollectionSize.Require(absent = ZERO)
126 @CollectionFeature.Require({SUPPORTS_REMOVE, ALLOWS_NULL_VALUES})
127 public void testRemove_nullPresent() {
128 initCollectionWithNullElement();
129 assertEquals(1, getMultiset().remove(null, 2));
130 assertFalse("multiset contains present after multiset.remove(present, 2)",
131 getMultiset().contains(null));
132 assertEquals(0, getMultiset().count(null));
133 }
134
135 @CollectionFeature.Require({SUPPORTS_REMOVE, ALLOWS_NULL_QUERIES})
136 public void testRemove_nullAbsent() {
137 assertEquals(0, getMultiset().remove(null, 2));
138 }
139
140 @CollectionFeature.Require(value = SUPPORTS_REMOVE, absent = ALLOWS_NULL_QUERIES)
141 public void testRemove_nullForbidden() {
142 try {
143 getMultiset().remove(null, 2);
144 fail("Expected NullPointerException");
145 } catch (NullPointerException expected) {}
146 }
147
148 @CollectionSize.Require(SEVERAL)
149 @CollectionFeature.Require(SUPPORTS_REMOVE)
150 public void testRemoveAllIgnoresCount() {
151 initThreeCopies();
152 assertTrue(getMultiset().removeAll(Collections.singleton(samples.e0)));
153 assertThat(getMultiset()).isEmpty();
154 }
155
156 @CollectionSize.Require(SEVERAL)
157 @CollectionFeature.Require(SUPPORTS_REMOVE)
158 public void testRetainAllIgnoresCount() {
159 initThreeCopies();
160 List<E> contents = Helpers.copyToList(getMultiset());
161 assertFalse(getMultiset().retainAll(Collections.singleton(samples.e0)));
162 expectContents(contents);
163 }
164 }
165