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/*
* Copyright (C) 2007 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;
import com.google.common.annotations.GwtCompatible;
import java.util.Collections;
import java.util.Map.Entry;
import junit.framework.TestCase;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* Tests for {@code AbstractMapEntry}.
*
* @author Mike Bostock
*/
@GwtCompatible
public class AbstractMapEntryTest extends TestCase {
private static final @Nullable String NK = null;
private static final @Nullable Integer NV = null;
private static <K, V> Entry<K, V> entry(final K key, final V value) {
return new AbstractMapEntry<K, V>() {
@Override
public K getKey() {
return key;
}
@Override
public V getValue() {
return value;
}
};
}
private static <K, V> Entry<K, V> control(K key, V value) {
return Collections.singletonMap(key, value).entrySet().iterator().next();
}
public void testToString() {
assertEquals("foo=1", entry("foo", 1).toString());
}
public void testToStringNull() {
assertEquals("null=1", entry(NK, 1).toString());
assertEquals("foo=null", entry("foo", NV).toString());
assertEquals("null=null", entry(NK, NV).toString());
}
public void testEquals() {
Entry<String, Integer> foo1 = entry("foo", 1);
// Explicitly call `equals`; `assertEquals` might return fast
assertTrue(foo1.equals(foo1));
assertEquals(control("foo", 1), foo1);
assertEquals(control("bar", 2), entry("bar", 2));
assertFalse(control("foo", 1).equals(entry("foo", 2)));
assertFalse(foo1.equals(control("bar", 1)));
assertFalse(foo1.equals(new Object()));
assertFalse(foo1.equals(null));
}
public void testEqualsNull() {
assertEquals(control(NK, 1), entry(NK, 1));
assertEquals(control("bar", NV), entry("bar", NV));
assertFalse(control(NK, 1).equals(entry(NK, 2)));
assertFalse(entry(NK, 1).equals(control("bar", 1)));
assertFalse(entry(NK, 1).equals(new Object()));
assertFalse(entry(NK, 1).equals(null));
}
public void testHashCode() {
assertEquals(control("foo", 1).hashCode(), entry("foo", 1).hashCode());
assertEquals(control("bar", 2).hashCode(), entry("bar", 2).hashCode());
}
public void testHashCodeNull() {
assertEquals(control(NK, 1).hashCode(), entry(NK, 1).hashCode());
assertEquals(control("bar", NV).hashCode(), entry("bar", NV).hashCode());
assertEquals(control(NK, NV).hashCode(), entry(NK, NV).hashCode());
}
}
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