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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  
17  package com.google.common.collect.testing.testers;
18  
19  import static com.google.common.collect.testing.features.CollectionSize.ZERO;
20  import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEYS;
21  import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEY_QUERIES;
22  
23  import com.google.common.annotations.GwtCompatible;
24  import com.google.common.collect.testing.AbstractMapTester;
25  import com.google.common.collect.testing.WrongType;
26  import com.google.common.collect.testing.features.CollectionSize;
27  import 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   * @author Kevin Bourrillion
35   * @author Chris Povirk
36   */
37  @GwtCompatible
38  public class MapGetTester<K, V> extends AbstractMapTester<K, V> {
39    @CollectionSize.Require(absent = ZERO)
40    public void testGet_yes() {
41      assertEquals("get(present) should return the associated value", v0(), get(k0()));
42    }
43  
44    public void testGet_no() {
45      assertNull("get(notPresent) should return null", get(k3()));
46    }
47  
48    @MapFeature.Require(ALLOWS_NULL_KEY_QUERIES)
49    public void testGet_nullNotContainedButAllowed() {
50      assertNull("get(null) should return null", get(null));
51    }
52  
53    @MapFeature.Require(absent = ALLOWS_NULL_KEY_QUERIES)
54    public void testGet_nullNotContainedAndUnsupported() {
55      try {
56        assertNull("get(null) should return null or throw", get(null));
57      } catch (NullPointerException tolerated) {
58      }
59    }
60  
61    @MapFeature.Require(ALLOWS_NULL_KEYS)
62    @CollectionSize.Require(absent = ZERO)
63    public void testGet_nonNullWhenNullContained() {
64      initMapWithNullKey();
65      assertNull("get(notPresent) should return null", get(k3()));
66    }
67  
68    @MapFeature.Require(ALLOWS_NULL_KEYS)
69    @CollectionSize.Require(absent = ZERO)
70    public void testGet_nullContained() {
71      initMapWithNullKey();
72      assertEquals("get(null) should return the associated value", getValueForNullKey(), get(null));
73    }
74  
75    public void testGet_wrongType() {
76      try {
77        assertNull("get(wrongType) should return null or throw", getMap().get(WrongType.VALUE));
78      } catch (ClassCastException tolerated) {
79      }
80    }
81  }