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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_QUERIES;
     22 
     23 import com.google.common.collect.testing.AbstractMapTester;
     24 import com.google.common.collect.testing.WrongType;
     25 import com.google.common.collect.testing.features.CollectionSize;
     26 import com.google.common.collect.testing.features.MapFeature;
     27 
     28 /**
     29  * A generic JUnit test which tests {@code containsKey()} operations on a map.
     30  * Can't be invoked directly; please see
     31  * {@link com.google.common.collect.testing.MapTestSuiteBuilder}.
     32  *
     33  * <p>This class is GWT compatible.
     34  *
     35  * @author George van den Driessche
     36  */
     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",
     41         getMap().containsKey(samples.e0.getKey()));
     42   }
     43 
     44   public void testContains_no() {
     45     assertFalse("containsKey(notPresent) should return false",
     46         getMap().containsKey(samples.e3.getKey()));
     47   }
     48 
     49   @MapFeature.Require(ALLOWS_NULL_QUERIES)
     50   public void testContains_nullNotContainedButAllowed() {
     51     assertFalse("containsKey(null) should return false",
     52         getMap().containsKey(null));
     53   }
     54 
     55   @MapFeature.Require(absent = ALLOWS_NULL_QUERIES)
     56   public void testContains_nullNotContainedAndUnsupported() {
     57     expectNullKeyMissingWhenNullKeysUnsupported(
     58         "containsKey(null) should return false or throw");
     59   }
     60 
     61   @MapFeature.Require(ALLOWS_NULL_KEYS)
     62   @CollectionSize.Require(absent = ZERO)
     63   public void testContains_nonNullWhenNullContained() {
     64     initMapWithNullKey();
     65     assertFalse("containsKey(notPresent) should return false",
     66         getMap().containsKey(samples.e3.getKey()));
     67   }
     68 
     69   @MapFeature.Require(ALLOWS_NULL_KEYS)
     70   @CollectionSize.Require(absent = ZERO)
     71   public void testContains_nullContained() {
     72     initMapWithNullKey();
     73     assertTrue("containsKey(null) should return true",
     74         getMap().containsKey(null));
     75   }
     76 
     77   public void testContains_wrongType() {
     78     try {
     79       //noinspection SuspiciousMethodCalls
     80       assertFalse("containsKey(wrongType) should return false or throw",
     81           getMap().containsKey(WrongType.VALUE));
     82     } catch (ClassCastException tolerated) {
     83     }
     84   }
     85 }
     86