93 lines
2.9 KiB
Java
93 lines
2.9 KiB
Java
/*
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* Copyright (C) 2007 The Guava Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.common.collect;
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import com.google.common.annotations.GwtCompatible;
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import java.util.Collections;
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import java.util.Map.Entry;
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import junit.framework.TestCase;
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/**
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* Tests for {@code AbstractMapEntry}.
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*
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* @author Mike Bostock
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*/
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@GwtCompatible
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public class AbstractMapEntryTest extends TestCase {
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private static final String NK = null;
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private static final Integer NV = null;
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private static <K, V> Entry<K, V> entry(final K key, final V value) {
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return new AbstractMapEntry<K, V>() {
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@Override
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public K getKey() {
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return key;
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}
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@Override
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public V getValue() {
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return value;
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}
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};
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}
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private static <K, V> Entry<K, V> control(K key, V value) {
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return Collections.singletonMap(key, value).entrySet().iterator().next();
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}
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public void testToString() {
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assertEquals("foo=1", entry("foo", 1).toString());
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}
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public void testToStringNull() {
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assertEquals("null=1", entry(NK, 1).toString());
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assertEquals("foo=null", entry("foo", NV).toString());
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assertEquals("null=null", entry(NK, NV).toString());
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}
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public void testEquals() {
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Entry<String, Integer> foo1 = entry("foo", 1);
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assertEquals(foo1, foo1);
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assertEquals(control("foo", 1), foo1);
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assertEquals(control("bar", 2), entry("bar", 2));
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assertFalse(control("foo", 1).equals(entry("foo", 2)));
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assertFalse(foo1.equals(control("bar", 1)));
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assertFalse(foo1.equals(new Object()));
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assertFalse(foo1.equals(null));
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}
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public void testEqualsNull() {
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assertEquals(control(NK, 1), entry(NK, 1));
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assertEquals(control("bar", NV), entry("bar", NV));
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assertFalse(control(NK, 1).equals(entry(NK, 2)));
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assertFalse(entry(NK, 1).equals(control("bar", 1)));
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assertFalse(entry(NK, 1).equals(new Object()));
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assertFalse(entry(NK, 1).equals(null));
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}
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public void testHashCode() {
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assertEquals(control("foo", 1).hashCode(), entry("foo", 1).hashCode());
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assertEquals(control("bar", 2).hashCode(), entry("bar", 2).hashCode());
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}
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public void testHashCodeNull() {
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assertEquals(control(NK, 1).hashCode(), entry(NK, 1).hashCode());
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assertEquals(control("bar", NV).hashCode(), entry("bar", NV).hashCode());
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assertEquals(control(NK, NV).hashCode(), entry(NK, NV).hashCode());
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}
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}
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