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
17package com.google.common.collect.testing.testers;
18
19import static com.google.common.collect.testing.features.CollectionFeature.KNOWN_ORDER;
20import static com.google.common.collect.testing.features.CollectionSize.ONE;
21import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
22import static com.google.common.collect.testing.features.CollectionSize.ZERO;
23
24import com.google.common.collect.testing.features.CollectionFeature;
25import com.google.common.collect.testing.features.CollectionSize;
26
27import 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 * <p>This class is GWT compatible.
35 *
36 * @author Jared Levy
37 */
38public class QueueElementTester<E> extends AbstractQueueTester<E> {
39  @CollectionSize.Require(ZERO)
40  public void testElement_empty() {
41    try {
42      getQueue().element();
43      fail("emptyQueue.element() should throw");
44    } catch (NoSuchElementException expected) {}
45    expectUnchanged();
46  }
47
48  @CollectionSize.Require(ONE)
49  public void testElement_size1() {
50    assertEquals("size1Queue.element() should return first element",
51        samples.e0, getQueue().element());
52    expectUnchanged();
53  }
54
55  @CollectionFeature.Require(KNOWN_ORDER)
56  @CollectionSize.Require(SEVERAL)
57  public void testElement_sizeMany() {
58    assertEquals("sizeManyQueue.element() should return first element",
59        samples.e0, getQueue().element());
60    expectUnchanged();
61  }
62}
63