MapGetTester.java revision 3c77433663281544363151bf284b0240dfd22a42 
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.annotations.GwtCompatible;
24import com.google.common.collect.testing.AbstractMapTester;
25import com.google.common.collect.testing.WrongType;
26import com.google.common.collect.testing.features.CollectionFeature;
27import com.google.common.collect.testing.features.CollectionSize;
28import com.google.common.collect.testing.features.MapFeature;
29
30/**
31 * A generic JUnit test which tests {@code get} operations on a map. Can't be
32 * invoked directly; please see
33 * {@link com.google.common.collect.testing.MapTestSuiteBuilder}.
34 *
35 * <p>This class is GWT compatible.
36 *
37 * @author Kevin Bourrillion
38 * @author Chris Povirk
39 */
40@GwtCompatible
41public class MapGetTester<K, V> extends AbstractMapTester<K, V> {
42  @CollectionSize.Require(absent = ZERO)
43  public void testGet_yes() {
44    assertEquals("get(present) should return the associated value",
45        samples.e0.getValue(), get(samples.e0.getKey()));
46  }
47
48  public void testGet_no() {
49    assertNull("get(notPresent) should return null", get(samples.e3.getKey()));
50  }
51
52  @CollectionFeature.Require(ALLOWS_NULL_QUERIES)
53  public void testGet_nullNotContainedButAllowed() {
54    assertNull("get(null) should return null", get(null));
55  }
56
57  @CollectionFeature.Require(absent = ALLOWS_NULL_QUERIES)
58  public void testGet_nullNotContainedAndUnsupported() {
59    try {
60      assertNull("get(null) should return null or throw", get(null));
61    } catch (NullPointerException tolerated) {
62    }
63  }
64
65  @MapFeature.Require(ALLOWS_NULL_KEYS)
66  @CollectionSize.Require(absent = ZERO)
67  public void testGet_nonNullWhenNullContained() {
68    initMapWithNullKey();
69    assertNull("get(notPresent) should return null", get(samples.e3.getKey()));
70  }
71
72  @MapFeature.Require(ALLOWS_NULL_KEYS)
73  @CollectionSize.Require(absent = ZERO)
74  public void testGet_nullContained() {
75    initMapWithNullKey();
76    assertEquals("get(null) should return the associated value",
77        getValueForNullKey(), get(null));
78  }
79
80  public void testGet_wrongType() {
81    try {
82      assertNull("get(wrongType) should return null or throw",
83          getMap().get(WrongType.VALUE));
84    } catch (ClassCastException tolerated) {
85    }
86  }
87}
88