1 /* 2 * Copyright (C) 2013 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except 5 * in compliance with the License. You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software distributed under the License 10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express 11 * or implied. See the License for the specific language governing permissions and limitations under 12 * the License. 13 */ 14 15 package com.google.common.collect.testing.testers; 16 17 import static com.google.common.collect.testing.features.CollectionSize.ONE; 18 import static com.google.common.collect.testing.features.CollectionSize.ZERO; 19 import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEYS; 20 import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_VALUES; 21 22 import com.google.common.annotations.GwtCompatible; 23 import com.google.common.collect.testing.AbstractMapTester; 24 import com.google.common.collect.testing.features.CollectionSize; 25 import com.google.common.collect.testing.features.MapFeature; 26 27 import java.util.LinkedHashMap; 28 import java.util.Map; 29 import java.util.Map.Entry; 30 import java.util.Set; 31 32 /** 33 * A generic JUnit test which tests {@code toString()} operations on a map. Can't be invoked 34 * directly; please see {@link com.google.common.collect.testing.MapTestSuiteBuilder}. 35 * 36 * @author Kevin Bourrillion 37 * @author Louis Wasserman 38 */ 39 @GwtCompatible 40 public class MapToStringTester<K, V> extends AbstractMapTester<K, V> { 41 public void testToString_minimal() { 42 assertNotNull("toString() should not return null", getMap().toString()); 43 } 44 45 @CollectionSize.Require(ZERO) 46 public void testToString_size0() { 47 assertEquals("emptyMap.toString should return {}", "{}", getMap().toString()); 48 } 49 50 @CollectionSize.Require(ONE) 51 public void testToString_size1() { 52 assertEquals( 53 "size1Map.toString should return {entry}", "{" + samples.e0 + "}", getMap().toString()); 54 } 55 56 @CollectionSize.Require(absent = ZERO) 57 @MapFeature.Require(ALLOWS_NULL_KEYS) 58 public void testToStringWithNullKey() { 59 initMapWithNullKey(); 60 testToString_formatting(); 61 } 62 63 @CollectionSize.Require(absent = ZERO) 64 @MapFeature.Require(ALLOWS_NULL_VALUES) 65 public void testToStringWithNullValue() { 66 initMapWithNullValue(); 67 testToString_formatting(); 68 } 69 70 public void testToString_formatting() { 71 assertEquals( 72 "map.toString() incorrect", expectedToString(getMap().entrySet()), getMap().toString()); 73 } 74 75 private String expectedToString(Set<Entry<K, V>> entries) { 76 Map<K, V> reference = new LinkedHashMap<K, V>(); 77 for (Map.Entry<K, V> entry : entries) { 78 reference.put(entry.getKey(), entry.getValue()); 79 } 80 return reference.toString(); 81 } 82 } 83
