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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.CollectionSize.ONE;
21  import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
22  import static com.google.common.collect.testing.features.CollectionSize.ZERO;
23  
24  import com.google.common.annotations.GwtCompatible;
25  import com.google.common.collect.testing.features.CollectionFeature;
26  import com.google.common.collect.testing.features.CollectionSize;
27  import java.util.NoSuchElementException;
28  
29  /**
30   * A generic JUnit test which tests {@code element()} operations on a queue.
31   * Can't be invoked directly; please see
32   * {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
33   *
34   * @author Jared Levy
35   */
36  @GwtCompatible
37  public class QueueElementTester<E> extends AbstractQueueTester<E> {
38    @CollectionSize.Require(ZERO)
39    public void testElement_empty() {
40      try {
41        getQueue().element();
42        fail("emptyQueue.element() should throw");
43      } catch (NoSuchElementException expected) {
44      }
45      expectUnchanged();
46    }
47  
48    @CollectionSize.Require(ONE)
49    public void testElement_size1() {
50      assertEquals("size1Queue.element() should return first element", e0(), getQueue().element());
51      expectUnchanged();
52    }
53  
54    @CollectionFeature.Require(KNOWN_ORDER)
55    @CollectionSize.Require(SEVERAL)
56    public void testElement_sizeMany() {
57      assertEquals("sizeManyQueue.element() should return first element", e0(), getQueue().element());
58      expectUnchanged();
59    }
60  }