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.CollectionFeature.SUPPORTS_REMOVE; 21 import static com.google.common.collect.testing.features.CollectionSize.ONE; 22 import static com.google.common.collect.testing.features.CollectionSize.SEVERAL; 23 import static com.google.common.collect.testing.features.CollectionSize.ZERO; 24 25 import com.google.common.annotations.GwtCompatible; 26 import com.google.common.collect.testing.features.CollectionFeature; 27 import 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 * @author Jared Levy 35 */ 36 @SuppressWarnings("unchecked") // too many "unchecked generic array creations" 37 @GwtCompatible 38 public class QueuePollTester<E> extends AbstractQueueTester<E> { 39 @CollectionFeature.Require(SUPPORTS_REMOVE) 40 @CollectionSize.Require(ZERO) testPoll_empty()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) testPoll_size1()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) testPoll_sizeMany()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