1/*
2 * Copyright (C) 2007 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.common.collect.testing.testers;
18
19import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_QUERIES;
20import static com.google.common.collect.testing.features.CollectionSize.ZERO;
21import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEYS;
22
23import com.google.common.collect.testing.AbstractMapTester;
24import com.google.common.collect.testing.WrongType;
25import com.google.common.collect.testing.features.CollectionFeature;
26import com.google.common.collect.testing.features.CollectionSize;
27import com.google.common.collect.testing.features.MapFeature;
28
29/**
30 * A generic JUnit test which tests {@code get} operations on a map. Can't be
31 * invoked directly; please see
32 * {@link com.google.common.collect.testing.MapTestSuiteBuilder}.
33 *
34 * <p>This class is GWT compatible.
35 *
36 * @author Kevin Bourrillion
37 * @author Chris Povirk
38 */
39public class MapGetTester<K, V> extends AbstractMapTester<K, V> {
40  @CollectionSize.Require(absent = ZERO)
41  public void testGet_yes() {
42    assertEquals("get(present) should return the associated value",
43        samples.e0.getValue(), get(samples.e0.getKey()));
44  }
45
46  public void testGet_no() {
47    assertNull("get(notPresent) should return null", get(samples.e3.getKey()));
48  }
49
50  @CollectionFeature.Require(ALLOWS_NULL_QUERIES)
51  public void testGet_nullNotContainedButAllowed() {
52    assertNull("get(null) should return null", get(null));
53  }
54
55  @CollectionFeature.Require(absent = ALLOWS_NULL_QUERIES)
56  public void testGet_nullNotContainedAndUnsupported() {
57    try {
58      assertNull("get(null) should return null or throw", get(null));
59    } catch (NullPointerException tolerated) {
60    }
61  }
62
63  @MapFeature.Require(ALLOWS_NULL_KEYS)
64  @CollectionSize.Require(absent = ZERO)
65  public void testGet_nonNullWhenNullContained() {
66    initMapWithNullKey();
67    assertNull("get(notPresent) should return null", get(samples.e3.getKey()));
68  }
69
70  @MapFeature.Require(ALLOWS_NULL_KEYS)
71  @CollectionSize.Require(absent = ZERO)
72  public void testGet_nullContained() {
73    initMapWithNullKey();
74    assertEquals("get(null) should return the associated value",
75        getValueForNullKey(), get(null));
76  }
77
78  public void testGet_wrongType() {
79    try {
80      assertNull("get(wrongType) should return null or throw",
81          getMap().get(WrongType.VALUE));
82    } catch (ClassCastException tolerated) {
83    }
84  }
85}
86