001/*
002 * Copyright (C) 2008 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.testers;
018
019import static com.google.common.collect.testing.features.CollectionSize.ZERO;
020import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_VALUES;
021import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_VALUE_QUERIES;
022
023import com.google.common.annotations.GwtCompatible;
024import com.google.common.collect.testing.AbstractMapTester;
025import com.google.common.collect.testing.WrongType;
026import com.google.common.collect.testing.features.CollectionSize;
027import com.google.common.collect.testing.features.MapFeature;
028
029/**
030 * A generic JUnit test which tests {@code containsValue()} operations on a map. Can't be invoked
031 * directly; please see {@link com.google.common.collect.testing.MapTestSuiteBuilder}.
032 *
033 * @author George van den Driessche
034 * @author Chris Povirk
035 */
036@GwtCompatible
037public class MapContainsValueTester<K, V> extends AbstractMapTester<K, V> {
038  @CollectionSize.Require(absent = ZERO)
039  public void testContains_yes() {
040    assertTrue("containsValue(present) should return true", getMap().containsValue(v0()));
041  }
042
043  public void testContains_no() {
044    assertFalse("containsValue(notPresent) should return false", getMap().containsValue(v3()));
045  }
046
047  @MapFeature.Require(ALLOWS_NULL_VALUE_QUERIES)
048  public void testContains_nullNotContainedButAllowed() {
049    assertFalse("containsValue(null) should return false", getMap().containsValue(null));
050  }
051
052  @MapFeature.Require(absent = ALLOWS_NULL_VALUE_QUERIES)
053  public void testContains_nullNotContainedAndUnsupported() {
054    expectNullValueMissingWhenNullValuesUnsupported(
055        "containsValue(null) should return false or throw");
056  }
057
058  @MapFeature.Require(ALLOWS_NULL_VALUES)
059  @CollectionSize.Require(absent = ZERO)
060  public void testContains_nonNullWhenNullContained() {
061    initMapWithNullValue();
062    assertFalse("containsValue(notPresent) should return false", getMap().containsValue(v3()));
063  }
064
065  @MapFeature.Require(ALLOWS_NULL_VALUES)
066  @CollectionSize.Require(absent = ZERO)
067  public void testContains_nullContained() {
068    initMapWithNullValue();
069    assertTrue("containsValue(null) should return true", getMap().containsValue(null));
070  }
071
072  public void testContains_wrongType() {
073    try {
074      // noinspection SuspiciousMethodCalls
075      assertFalse(
076          "containsValue(wrongType) should return false or throw",
077          getMap().containsValue(WrongType.VALUE));
078    } catch (ClassCastException tolerated) {
079    }
080  }
081}