guava

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 org.junit.Ignore;
28

29
/**
30
 * A generic JUnit test which tests {@code peek()} operations on a queue. Can't be invoked directly;
31
 * please see {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
32
 *
33
 * @author Jared Levy
34
 */
35
@GwtCompatible
36
@Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
37
public class QueuePeekTester<E> extends AbstractQueueTester<E> {
38
  @CollectionSize.Require(ZERO)
39
  public void testPeek_empty() {
40
    assertNull("emptyQueue.peek() should return null", getQueue().peek());
41
    expectUnchanged();
42
  }
43

44
  @CollectionSize.Require(ONE)
45
  public void testPeek_size1() {
46
    assertEquals("size1Queue.peek() should return first element", e0(), getQueue().peek());
47
    expectUnchanged();
48
  }
49

50
  @CollectionFeature.Require(KNOWN_ORDER)
51
  @CollectionSize.Require(SEVERAL)
52
  public void testPeek_sizeMany() {
53
    assertEquals("sizeManyQueue.peek() should return first element", e0(), getQueue().peek());
54
    expectUnchanged();
55
  }
56
}
57