001/*
002 * Copyright (C) 2008 The Guava Authors
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package com.google.common.collect.testing.testers;
018
019import static com.google.common.collect.testing.features.CollectionFeature.KNOWN_ORDER;
020import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_REMOVE;
021import static com.google.common.collect.testing.features.CollectionSize.ONE;
022import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
023import static com.google.common.collect.testing.features.CollectionSize.ZERO;
024
025import com.google.common.annotations.GwtCompatible;
026import com.google.common.collect.testing.features.CollectionFeature;
027import com.google.common.collect.testing.features.CollectionSize;
028import org.junit.Ignore;
029
030/**
031 * A generic JUnit test which tests {@code poll()} operations on a queue. Can't be invoked directly;
032 * please see {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
033 *
034 * @author Jared Levy
035 */
036@GwtCompatible
037@Ignore("test runners must not instantiate and run this directly, only via suites we build")
038// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
039@SuppressWarnings("JUnit4ClassUsedInJUnit3")
040public class QueuePollTester<E> extends AbstractQueueTester<E> {
041  @CollectionFeature.Require(SUPPORTS_REMOVE)
042  @CollectionSize.Require(ZERO)
043  public void testPoll_empty() {
044    assertNull("emptyQueue.poll() should return null", getQueue().poll());
045    expectUnchanged();
046  }
047
048  @CollectionFeature.Require(SUPPORTS_REMOVE)
049  @CollectionSize.Require(ONE)
050  public void testPoll_size1() {
051    assertEquals("size1Queue.poll() should return first element", e0(), getQueue().poll());
052    expectMissing(e0());
053  }
054
055  @CollectionFeature.Require({KNOWN_ORDER, SUPPORTS_REMOVE})
056  @CollectionSize.Require(SEVERAL)
057  public void testPoll_sizeMany() {
058    assertEquals("sizeManyQueue.poll() should return first element", e0(), getQueue().poll());
059    expectMissing(e0());
060  }
061}