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.CollectionFeature.ALLOWS_NULL_QUERIES;
20 import static com.google.common.collect.testing.features.CollectionSize.ZERO;
21 import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEYS;
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.CollectionFeature;
27 import com.google.common.collect.testing.features.CollectionSize;
28 import 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  * @author Kevin Bourrillion
36  * @author Chris Povirk
37  */
38 @GwtCompatible
39 public class MapGetTester<K, V> extends AbstractMapTester<K, V> {
40   @CollectionSize.Require(absent = ZERO)
testGet_yes()41   public void testGet_yes() {
42     assertEquals("get(present) should return the associated value",
43         samples.e0.getValue(), get(samples.e0.getKey()));
44   }
45 
testGet_no()46   public void testGet_no() {
47     assertNull("get(notPresent) should return null", get(samples.e3.getKey()));
48   }
49 
50   @CollectionFeature.Require(ALLOWS_NULL_QUERIES)
testGet_nullNotContainedButAllowed()51   public void testGet_nullNotContainedButAllowed() {
52     assertNull("get(null) should return null", get(null));
53   }
54 
55   @CollectionFeature.Require(absent = ALLOWS_NULL_QUERIES)
testGet_nullNotContainedAndUnsupported()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)
testGet_nonNullWhenNullContained()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)
testGet_nullContained()72   public void testGet_nullContained() {
73     initMapWithNullKey();
74     assertEquals("get(null) should return the associated value",
75         getValueForNullKey(), get(null));
76   }
77 
testGet_wrongType()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