1 /* 2 * Copyright (C) 2016 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.ZERO; 20 import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEYS; 21 import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_VALUES; 22 import static com.google.common.collect.testing.features.MapFeature.SUPPORTS_PUT; 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.Map; 29 import java.util.Map.Entry; 30 import junit.framework.AssertionFailedError; 31 import org.junit.Ignore; 32 33 /** 34 * A generic JUnit test which tests {@link Map#computeIfPresent}. Can't be invoked directly; please 35 * see {@link com.google.common.collect.testing.MapTestSuiteBuilder}. 36 * 37 * @author Louis Wasserman 38 */ 39 @GwtCompatible 40 @Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests. 41 public class MapComputeIfPresentTester<K, V> extends AbstractMapTester<K, V> { 42 43 @MapFeature.Require(SUPPORTS_PUT) testComputeIfPresent_supportedAbsent()44 public void testComputeIfPresent_supportedAbsent() { 45 assertNull( 46 "computeIfPresent(notPresent, function) should return null", 47 getMap() 48 .computeIfPresent( 49 k3(), 50 (k, v) -> { 51 throw new AssertionFailedError(); 52 })); 53 expectUnchanged(); 54 } 55 56 @MapFeature.Require(SUPPORTS_PUT) 57 @CollectionSize.Require(absent = ZERO) testComputeIfPresent_supportedPresent()58 public void testComputeIfPresent_supportedPresent() { 59 assertEquals( 60 "computeIfPresent(present, function) should return new value", 61 v3(), 62 getMap() 63 .computeIfPresent( 64 k0(), 65 (k, v) -> { 66 assertEquals(k0(), k); 67 assertEquals(v0(), v); 68 return v3(); 69 })); 70 expectReplacement(entry(k0(), v3())); 71 } 72 73 @MapFeature.Require(SUPPORTS_PUT) 74 @CollectionSize.Require(absent = ZERO) testComputeIfPresent_functionReturnsNull()75 public void testComputeIfPresent_functionReturnsNull() { 76 assertNull( 77 "computeIfPresent(present, returnsNull) should return null", 78 getMap() 79 .computeIfPresent( 80 k0(), 81 (k, v) -> { 82 assertEquals(k0(), k); 83 assertEquals(v0(), v); 84 return null; 85 })); 86 expectMissing(e0()); 87 } 88 89 @MapFeature.Require({SUPPORTS_PUT, ALLOWS_NULL_VALUES}) 90 @CollectionSize.Require(absent = ZERO) testComputeIfPresent_nullTreatedAsAbsent()91 public void testComputeIfPresent_nullTreatedAsAbsent() { 92 initMapWithNullValue(); 93 assertNull( 94 "computeIfPresent(presentAssignedToNull, function) should return null", 95 getMap() 96 .computeIfPresent( 97 getKeyForNullValue(), 98 (k, v) -> { 99 throw new AssertionFailedError(); 100 })); 101 expectReplacement(entry(getKeyForNullValue(), null)); 102 } 103 104 static class ExpectedException extends RuntimeException {} 105 106 @MapFeature.Require(SUPPORTS_PUT) 107 @CollectionSize.Require(absent = ZERO) testComputeIfPresent_functionThrows()108 public void testComputeIfPresent_functionThrows() { 109 try { 110 getMap() 111 .computeIfPresent( 112 k0(), 113 (k, v) -> { 114 assertEquals(k0(), k); 115 assertEquals(v0(), v); 116 throw new ExpectedException(); 117 }); 118 fail("Expected ExpectedException"); 119 } catch (ExpectedException expected) { 120 } 121 expectUnchanged(); 122 } 123 124 @MapFeature.Require({SUPPORTS_PUT, ALLOWS_NULL_KEYS}) 125 @CollectionSize.Require(absent = ZERO) testComputeIfPresent_nullKeySupportedPresent()126 public void testComputeIfPresent_nullKeySupportedPresent() { 127 initMapWithNullKey(); 128 assertEquals( 129 "computeIfPresent(null, function) should return new value", 130 v3(), 131 getMap() 132 .computeIfPresent( 133 null, 134 (k, v) -> { 135 assertNull(k); 136 assertEquals(getValueForNullKey(), v); 137 return v3(); 138 })); 139 140 Entry<K, V>[] expected = createArrayWithNullKey(); 141 expected[getNullLocation()] = entry(null, v3()); 142 expectContents(expected); 143 } 144 145 @MapFeature.Require({SUPPORTS_PUT, ALLOWS_NULL_KEYS}) testComputeIfPresent_nullKeySupportedAbsent()146 public void testComputeIfPresent_nullKeySupportedAbsent() { 147 assertNull( 148 "computeIfPresent(null, function) should return null", 149 getMap() 150 .computeIfPresent( 151 null, 152 (k, v) -> { 153 throw new AssertionFailedError(); 154 })); 155 expectUnchanged(); 156 } 157 158 @MapFeature.Require(absent = SUPPORTS_PUT) testComputeIfPresent_unsupportedAbsent()159 public void testComputeIfPresent_unsupportedAbsent() { 160 try { 161 getMap() 162 .computeIfPresent( 163 k3(), 164 (k, v) -> { 165 throw new AssertionFailedError(); 166 }); 167 } catch (UnsupportedOperationException tolerated) { 168 } 169 expectUnchanged(); 170 } 171 172 @MapFeature.Require(absent = SUPPORTS_PUT) 173 @CollectionSize.Require(absent = ZERO) testComputeIfPresent_unsupportedPresent()174 public void testComputeIfPresent_unsupportedPresent() { 175 try { 176 getMap().computeIfPresent(k0(), (k, v) -> v3()); 177 fail("Expected UnsupportedOperationException"); 178 } catch (UnsupportedOperationException expected) { 179 } 180 expectUnchanged(); 181 } 182 } 183