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;
028import org.junit.Ignore;
029
030/**
031 * A generic JUnit test which tests {@code get} operations on a map. Can't be invoked directly;
032 * please see {@link com.google.common.collect.testing.MapTestSuiteBuilder}.
033 *
034 * @author Kevin Bourrillion
035 * @author Chris Povirk
036 */
037@GwtCompatible
038@Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
039public class MapGetTester<K, V> extends AbstractMapTester<K, V> {
040  @CollectionSize.Require(absent = ZERO)
041  public void testGet_yes() {
042    assertEquals("get(present) should return the associated value", v0(), get(k0()));
043  }
044
045  public void testGet_no() {
046    assertNull("get(notPresent) should return null", get(k3()));
047  }
048
049  @MapFeature.Require(ALLOWS_NULL_KEY_QUERIES)
050  public void testGet_nullNotContainedButAllowed() {
051    assertNull("get(null) should return null", get(null));
052  }
053
054  @MapFeature.Require(absent = ALLOWS_NULL_KEY_QUERIES)
055  public void testGet_nullNotContainedAndUnsupported() {
056    try {
057      assertNull("get(null) should return null or throw", get(null));
058    } catch (NullPointerException tolerated) {
059    }
060  }
061
062  @MapFeature.Require(ALLOWS_NULL_KEYS)
063  @CollectionSize.Require(absent = ZERO)
064  public void testGet_nonNullWhenNullContained() {
065    initMapWithNullKey();
066    assertNull("get(notPresent) should return null", get(k3()));
067  }
068
069  @MapFeature.Require(ALLOWS_NULL_KEYS)
070  @CollectionSize.Require(absent = ZERO)
071  public void testGet_nullContained() {
072    initMapWithNullKey();
073    assertEquals("get(null) should return the associated value", getValueForNullKey(), get(null));
074  }
075
076  public void testGet_wrongType() {
077    try {
078      assertNull("get(wrongType) should return null or throw", getMap().get(WrongType.VALUE));
079    } catch (ClassCastException tolerated) {
080    }
081  }
082}