QueuePollTester.java revision 7dd252788645e940eada959bdde927426e2531c9
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.annotations.GwtCompatible; 26import com.google.common.collect.testing.features.CollectionFeature; 27import com.google.common.collect.testing.features.CollectionSize; 28 29/** 30 * A generic JUnit test which tests {@code poll()} 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 */ 38@SuppressWarnings("unchecked") // too many "unchecked generic array creations" 39@GwtCompatible 40public class QueuePollTester<E> extends AbstractQueueTester<E> { 41 @CollectionFeature.Require(SUPPORTS_REMOVE) 42 @CollectionSize.Require(ZERO) 43 public void testPoll_empty() { 44 assertNull("emptyQueue.poll() should return null", getQueue().poll()); 45 expectUnchanged(); 46 } 47 48 @CollectionFeature.Require(SUPPORTS_REMOVE) 49 @CollectionSize.Require(ONE) 50 public void testPoll_size1() { 51 assertEquals("size1Queue.poll() should return first element", 52 samples.e0, getQueue().poll()); 53 expectMissing(samples.e0); 54 } 55 56 @CollectionFeature.Require({KNOWN_ORDER, SUPPORTS_REMOVE}) 57 @CollectionSize.Require(SEVERAL) 58 public void testPoll_sizeMany() { 59 assertEquals("sizeManyQueue.poll() should return first element", 60 samples.e0, getQueue().poll()); 61 expectMissing(samples.e0); 62 } 63} 64