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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.KNOWN_ORDER;
20  import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_REMOVE;
21  import static com.google.common.collect.testing.features.CollectionSize.ONE;
22  import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
23  import static com.google.common.collect.testing.features.CollectionSize.ZERO;
24  
25  import com.google.common.annotations.GwtCompatible;
26  import com.google.common.collect.testing.features.CollectionFeature;
27  import com.google.common.collect.testing.features.CollectionSize;
28  import java.util.NoSuchElementException;
29  
30  /**
31   * A generic JUnit test which tests {@code remove()} operations on a queue.
32   * Can't be invoked directly; please see
33   * {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
34   *
35   * @author Jared Levy
36   */
37  @SuppressWarnings("unchecked") // too many "unchecked generic array creations"
38  @GwtCompatible
39  public class QueueRemoveTester<E> extends AbstractQueueTester<E> {
40    @CollectionFeature.Require(SUPPORTS_REMOVE)
41    @CollectionSize.Require(ZERO)
42    public void testRemove_empty() {
43      try {
44        getQueue().remove();
45        fail("emptyQueue.remove() should throw");
46      } catch (NoSuchElementException expected) {
47      }
48      expectUnchanged();
49    }
50  
51    @CollectionFeature.Require(SUPPORTS_REMOVE)
52    @CollectionSize.Require(ONE)
53    public void testRemove_size1() {
54      assertEquals("size1Queue.remove() should return first element", e0(), getQueue().remove());
55      expectMissing(e0());
56    }
57  
58    @CollectionFeature.Require({KNOWN_ORDER, SUPPORTS_REMOVE})
59    @CollectionSize.Require(SEVERAL)
60    public void testRemove_sizeMany() {
61      assertEquals("sizeManyQueue.remove() should return first element", e0(), getQueue().remove());
62      expectMissing(e0());
63    }
64  }