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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.CollectionFeature.ALLOWS_NULL_VALUES;
20  import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_ADD;
21  
22  import com.google.common.annotations.GwtCompatible;
23  import com.google.common.collect.testing.features.CollectionFeature;
24  
25  /**
26   * A generic JUnit test which tests offer operations on a queue. Can't be
27   * invoked directly; please see
28   * {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
29   *
30   * @author Jared Levy
31   */
32  @SuppressWarnings("unchecked") // too many "unchecked generic array creations"
33  @GwtCompatible
34  public class QueueOfferTester<E> extends AbstractQueueTester<E> {
35    @CollectionFeature.Require(SUPPORTS_ADD)
36    public void testOffer_supportedNotPresent() {
37      assertTrue("offer(notPresent) should return true", getQueue().offer(e3()));
38      expectAdded(e3());
39    }
40  
41    @CollectionFeature.Require({SUPPORTS_ADD, ALLOWS_NULL_VALUES})
42    public void testOffer_nullSupported() {
43      assertTrue("offer(null) should return true", getQueue().offer(null));
44      expectAdded((E) null);
45    }
46  
47    @CollectionFeature.Require(value = SUPPORTS_ADD, absent = ALLOWS_NULL_VALUES)
48    public void testOffer_nullUnsupported() {
49      try {
50        getQueue().offer(null);
51        fail("offer(null) should throw");
52      } catch (NullPointerException expected) {
53      }
54      expectUnchanged();
55      expectNullMissingWhenNullUnsupported("Should not contain null after unsupported offer(null)");
56    }
57  }