001/* 002 * Copyright (C) 2015 The Guava Authors 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package com.google.common.collect.testing.testers; 018 019import static com.google.common.collect.testing.features.CollectionSize.ZERO; 020import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEYS; 021import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_VALUES; 022import static com.google.common.collect.testing.features.MapFeature.SUPPORTS_PUT; 023 024import com.google.common.annotations.GwtCompatible; 025import com.google.common.collect.testing.AbstractMapTester; 026import com.google.common.collect.testing.features.CollectionSize; 027import com.google.common.collect.testing.features.MapFeature; 028import java.util.Map; 029import org.junit.Ignore; 030 031/** 032 * A generic JUnit test which tests {@link Map#putIfAbsent}. Can't be invoked directly; please see 033 * {@link com.google.common.collect.testing.MapTestSuiteBuilder}. 034 * 035 * @author Louis Wasserman 036 */ 037@GwtCompatible 038@Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests. 039public class MapPutIfAbsentTester<K, V> extends AbstractMapTester<K, V> { 040 041 @MapFeature.Require(SUPPORTS_PUT) 042 public void testPutIfAbsent_supportedAbsent() { 043 assertNull( 044 "putIfAbsent(notPresent, value) should return null", getMap().putIfAbsent(k3(), v3())); 045 expectAdded(e3()); 046 } 047 048 @MapFeature.Require(SUPPORTS_PUT) 049 @CollectionSize.Require(absent = ZERO) 050 public void testPutIfAbsent_supportedPresent() { 051 assertEquals( 052 "putIfAbsent(present, value) should return existing value", 053 v0(), 054 getMap().putIfAbsent(k0(), v3())); 055 expectUnchanged(); 056 } 057 058 @MapFeature.Require(absent = SUPPORTS_PUT) 059 public void testPutIfAbsent_unsupportedAbsent() { 060 try { 061 getMap().putIfAbsent(k3(), v3()); 062 fail("putIfAbsent(notPresent, value) should throw"); 063 } catch (UnsupportedOperationException expected) { 064 } 065 expectUnchanged(); 066 expectMissing(e3()); 067 } 068 069 @MapFeature.Require(absent = SUPPORTS_PUT) 070 @CollectionSize.Require(absent = ZERO) 071 public void testPutIfAbsent_unsupportedPresentExistingValue() { 072 try { 073 assertEquals( 074 "putIfAbsent(present, existingValue) should return present or throw", 075 v0(), 076 getMap().putIfAbsent(k0(), v0())); 077 } catch (UnsupportedOperationException tolerated) { 078 } 079 expectUnchanged(); 080 } 081 082 @MapFeature.Require(absent = SUPPORTS_PUT) 083 @CollectionSize.Require(absent = ZERO) 084 public void testPutIfAbsent_unsupportedPresentDifferentValue() { 085 try { 086 getMap().putIfAbsent(k0(), v3()); 087 } catch (UnsupportedOperationException tolerated) { 088 } 089 expectUnchanged(); 090 } 091 092 @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_KEYS) 093 public void testPutIfAbsent_nullKeyUnsupported() { 094 try { 095 getMap().putIfAbsent(null, v3()); 096 fail("putIfAbsent(null, value) should throw"); 097 } catch (NullPointerException expected) { 098 } 099 expectUnchanged(); 100 expectNullKeyMissingWhenNullKeysUnsupported( 101 "Should not contain null key after unsupported putIfAbsent(null, value)"); 102 } 103 104 @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_VALUES) 105 public void testPutIfAbsent_nullValueUnsupported() { 106 try { 107 getMap().putIfAbsent(k3(), null); 108 fail("putIfAbsent(key, null) should throw"); 109 } catch (NullPointerException expected) { 110 } 111 expectUnchanged(); 112 expectNullValueMissingWhenNullValuesUnsupported( 113 "Should not contain null value after unsupported put(key, null)"); 114 } 115 116 @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_VALUES) 117 @CollectionSize.Require(absent = ZERO) 118 public void testPutIfAbsent_putWithNullValueUnsupported() { 119 try { 120 getMap().putIfAbsent(k0(), null); 121 } catch (NullPointerException tolerated) { 122 } 123 expectUnchanged(); 124 expectNullValueMissingWhenNullValuesUnsupported( 125 "Should not contain null after unsupported putIfAbsent(present, null)"); 126 } 127}