001/*
002 * Copyright (C) 2007 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_KEYS;
021import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEY_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 get} operations on a map. Can't be invoked directly;
031 * please see {@link com.google.common.collect.testing.MapTestSuiteBuilder}.
032 *
033 * @author Kevin Bourrillion
034 * @author Chris Povirk
035 */
036@GwtCompatible
037public class MapGetTester<K, V> extends AbstractMapTester<K, V> {
038  @CollectionSize.Require(absent = ZERO)
039  public void testGet_yes() {
040    assertEquals("get(present) should return the associated value", v0(), get(k0()));
041  }
042
043  public void testGet_no() {
044    assertNull("get(notPresent) should return null", get(k3()));
045  }
046
047  @MapFeature.Require(ALLOWS_NULL_KEY_QUERIES)
048  public void testGet_nullNotContainedButAllowed() {
049    assertNull("get(null) should return null", get(null));
050  }
051
052  @MapFeature.Require(absent = ALLOWS_NULL_KEY_QUERIES)
053  public void testGet_nullNotContainedAndUnsupported() {
054    try {
055      assertNull("get(null) should return null or throw", get(null));
056    } catch (NullPointerException tolerated) {
057    }
058  }
059
060  @MapFeature.Require(ALLOWS_NULL_KEYS)
061  @CollectionSize.Require(absent = ZERO)
062  public void testGet_nonNullWhenNullContained() {
063    initMapWithNullKey();
064    assertNull("get(notPresent) should return null", get(k3()));
065  }
066
067  @MapFeature.Require(ALLOWS_NULL_KEYS)
068  @CollectionSize.Require(absent = ZERO)
069  public void testGet_nullContained() {
070    initMapWithNullKey();
071    assertEquals("get(null) should return the associated value", getValueForNullKey(), get(null));
072  }
073
074  public void testGet_wrongType() {
075    try {
076      assertNull("get(wrongType) should return null or throw", getMap().get(WrongType.VALUE));
077    } catch (ClassCastException tolerated) {
078    }
079  }
080}