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1   /*
2    * Copyright (C) 2008 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 containsKey()} operations on a map.
31   * Can't be invoked directly; please see
32   * {@link com.google.common.collect.testing.MapTestSuiteBuilder}.
33   *
34   * @author George van den Driessche
35   */
36  @GwtCompatible
37  public class MapContainsKeyTester<K, V> extends AbstractMapTester<K, V> {
38    @CollectionSize.Require(absent = ZERO)
39    public void testContains_yes() {
40      assertTrue("containsKey(present) should return true", getMap().containsKey(k0()));
41    }
42  
43    public void testContains_no() {
44      assertFalse("containsKey(notPresent) should return false", getMap().containsKey(k3()));
45    }
46  
47    @MapFeature.Require(ALLOWS_NULL_KEY_QUERIES)
48    public void testContains_nullNotContainedButAllowed() {
49      assertFalse("containsKey(null) should return false", getMap().containsKey(null));
50    }
51  
52    @MapFeature.Require(absent = ALLOWS_NULL_KEY_QUERIES)
53    public void testContains_nullNotContainedAndUnsupported() {
54      expectNullKeyMissingWhenNullKeysUnsupported("containsKey(null) should return false or throw");
55    }
56  
57    @MapFeature.Require(ALLOWS_NULL_KEYS)
58    @CollectionSize.Require(absent = ZERO)
59    public void testContains_nonNullWhenNullContained() {
60      initMapWithNullKey();
61      assertFalse("containsKey(notPresent) should return false", getMap().containsKey(k3()));
62    }
63  
64    @MapFeature.Require(ALLOWS_NULL_KEYS)
65    @CollectionSize.Require(absent = ZERO)
66    public void testContains_nullContained() {
67      initMapWithNullKey();
68      assertTrue("containsKey(null) should return true", getMap().containsKey(null));
69    }
70  
71    public void testContains_wrongType() {
72      try {
73        //noinspection SuspiciousMethodCalls
74        assertFalse(
75            "containsKey(wrongType) should return false or throw",
76            getMap().containsKey(WrongType.VALUE));
77      } catch (ClassCastException tolerated) {
78      }
79    }
80  }