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/*
* Copyright (C) 2008 The Guava Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.common.collect.testing.testers;
import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEYS;
import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_VALUES;
import com.google.common.collect.testing.AbstractMapTester;
import com.google.common.collect.testing.Helpers;
import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.collect.testing.features.MapFeature;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
/**
* Tests {@link java.util.Map#equals}.
*
* <p>This class is GWT compatible.
*
* @author George van den Driessche
* @author Chris Povirk
*/
public class MapEqualsTester<K, V> extends AbstractMapTester<K, V> {
public void testEquals_otherMapWithSameEntries() {
assertTrue(
"A Map should equal any other Map containing the same entries.",
getMap().equals(newHashMap(getSampleEntries())));
}
@CollectionSize.Require(absent = CollectionSize.ZERO)
public void testEquals_otherMapWithDifferentEntries() {
Map<K, V> other = newHashMap(getSampleEntries(getNumEntries() - 1));
Entry<K, V> e3 = getSubjectGenerator().samples().e3;
other.put(e3.getKey(), e3.getValue());
assertFalse(
"A Map should not equal another Map containing different entries.",
getMap().equals(other)
);
}
@CollectionSize.Require(absent = CollectionSize.ZERO)
@MapFeature.Require(ALLOWS_NULL_KEYS)
public void testEquals_containingNullKey() {
Collection<Map.Entry<K, V>> entries = getSampleEntries(getNumEntries() - 1);
entries.add(entry(null, samples.e3.getValue()));
resetContainer(getSubjectGenerator().create(entries.toArray()));
assertTrue("A Map should equal any other Map containing the same entries,"
+ " even if some keys are null.",
getMap().equals(newHashMap(entries)));
}
@CollectionSize.Require(absent = CollectionSize.ZERO)
public void testEquals_otherContainsNullKey() {
Collection<Map.Entry<K, V>> entries = getSampleEntries(getNumEntries() - 1);
entries.add(entry(null, samples.e3.getValue()));
Map<K, V> other = newHashMap(entries);
assertFalse(
"Two Maps should not be equal if exactly one of them contains a null "
+ "key.",
getMap().equals(other));
}
@CollectionSize.Require(absent = CollectionSize.ZERO)
@MapFeature.Require(ALLOWS_NULL_VALUES)
public void testEquals_containingNullValue() {
Collection<Map.Entry<K, V>> entries = getSampleEntries(getNumEntries() - 1);
entries.add(entry(samples.e3.getKey(), null));
resetContainer(getSubjectGenerator().create(entries.toArray()));
assertTrue("A Map should equal any other Map containing the same entries,"
+ " even if some values are null.",
getMap().equals(newHashMap(entries)));
}
@CollectionSize.Require(absent = CollectionSize.ZERO)
public void testEquals_otherContainsNullValue() {
Collection<Map.Entry<K, V>> entries = getSampleEntries(getNumEntries() - 1);
entries.add(entry(samples.e3.getKey(), null));
Map<K, V> other = newHashMap(entries);
assertFalse(
"Two Maps should not be equal if exactly one of them contains a null "
+ "value.",
getMap().equals(other));
}
@CollectionSize.Require(absent = CollectionSize.ZERO)
public void testEquals_smallerMap() {
Collection<Map.Entry<K, V>> fewerEntries
= getSampleEntries(getNumEntries() - 1);
assertFalse("Maps of different sizes should not be equal.",
getMap().equals(newHashMap(fewerEntries)));
}
public void testEquals_largerMap() {
Collection<Map.Entry<K, V>> moreEntries
= getSampleEntries(getNumEntries() + 1);
assertFalse("Maps of different sizes should not be equal.",
getMap().equals(newHashMap(moreEntries)));
}
public void testEquals_list() {
assertFalse("A List should never equal a Map.",
getMap().equals(Helpers.copyToList(getMap().entrySet())));
}
private static <K, V> HashMap<K, V> newHashMap(
Collection<? extends Map.Entry<? extends K, ? extends V>> entries) {
HashMap<K, V> map = new HashMap<K, V>();
for (Map.Entry<? extends K, ? extends V> entry : entries) {
map.put(entry.getKey(), entry.getValue());
}
return map;
}
}
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