001/*
002 * Copyright (C) 2012 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.google;
018
019import static com.google.common.collect.testing.features.CollectionFeature.SERIALIZABLE;
020
021import com.google.common.annotations.GwtCompatible;
022import com.google.common.annotations.GwtIncompatible;
023import com.google.common.collect.BiMap;
024import com.google.common.collect.testing.Helpers;
025import com.google.common.collect.testing.features.CollectionFeature;
026import com.google.common.testing.SerializableTester;
027import java.io.Serializable;
028import java.lang.reflect.Method;
029import java.util.Collections;
030import java.util.List;
031import org.junit.Ignore;
032
033/**
034 * Tests for the {@code inverse} view of a BiMap.
035 *
036 * <p>This assumes that {@code bimap.inverse().inverse() == bimap}, which is not technically
037 * required but is fulfilled by all current implementations.
038 *
039 * @author Louis Wasserman
040 */
041@GwtCompatible(emulated = true)
042@Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
043public class BiMapInverseTester<K, V> extends AbstractBiMapTester<K, V> {
044
045  public void testInverseSame() {
046    assertSame(getMap(), getMap().inverse().inverse());
047  }
048
049  @CollectionFeature.Require(SERIALIZABLE)
050  public void testInverseSerialization() {
051    BiMapPair<K, V> pair = new BiMapPair<>(getMap());
052    BiMapPair<K, V> copy = SerializableTester.reserialize(pair);
053    assertEquals(pair.forward, copy.forward);
054    assertEquals(pair.backward, copy.backward);
055    assertSame(copy.backward, copy.forward.inverse());
056    assertSame(copy.forward, copy.backward.inverse());
057  }
058
059  private static class BiMapPair<K, V> implements Serializable {
060    final BiMap<K, V> forward;
061    final BiMap<V, K> backward;
062
063    BiMapPair(BiMap<K, V> original) {
064      this.forward = original;
065      this.backward = original.inverse();
066    }
067
068    private static final long serialVersionUID = 0;
069  }
070
071  /**
072   * Returns {@link Method} instances for the tests that assume that the inverse will be the same
073   * after serialization.
074   */
075  @GwtIncompatible // reflection
076  public static List<Method> getInverseSameAfterSerializingMethods() {
077    return Collections.singletonList(getMethod("testInverseSerialization"));
078  }
079
080  @GwtIncompatible // reflection
081  private static Method getMethod(String methodName) {
082    return Helpers.getMethod(BiMapInverseTester.class, methodName);
083  }
084}