QueuePollTester.java revision 1d580d0f6ee4f21eb309ba7b509d2c6d671c4044 
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.CollectionFeature.SUPPORTS_REMOVE;
21import static com.google.common.collect.testing.features.CollectionSize.ONE;
22import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
23import static com.google.common.collect.testing.features.CollectionSize.ZERO;
24
25import com.google.common.collect.testing.features.CollectionFeature;
26import com.google.common.collect.testing.features.CollectionSize;
27
28/**
29 * A generic JUnit test which tests {@code poll()} operations on a queue.
30 * Can't be invoked directly; please see
31 * {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
32 *
33 * <p>This class is GWT compatible.
34 *
35 * @author Jared Levy
36 */
37@SuppressWarnings("unchecked") // too many "unchecked generic array creations"
38public class QueuePollTester<E> extends AbstractQueueTester<E> {
39  @CollectionFeature.Require(SUPPORTS_REMOVE)
40  @CollectionSize.Require(ZERO)
41  public void testPoll_empty() {
42    assertNull("emptyQueue.poll() should return null", getQueue().poll());
43    expectUnchanged();
44  }
45
46  @CollectionFeature.Require(SUPPORTS_REMOVE)
47  @CollectionSize.Require(ONE)
48  public void testPoll_size1() {
49    assertEquals("size1Queue.poll() should return first element",
50        samples.e0, getQueue().poll());
51    expectMissing(samples.e0);
52  }
53
54  @CollectionFeature.Require({KNOWN_ORDER, SUPPORTS_REMOVE})
55  @CollectionSize.Require(SEVERAL)
56  public void testPoll_sizeMany() {
57    assertEquals("sizeManyQueue.poll() should return first element",
58        samples.e0, getQueue().poll());
59    expectMissing(samples.e0);
60  }
61}
62