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.CollectionSize.ONE; 021import static com.google.common.collect.testing.features.CollectionSize.SEVERAL; 022import static com.google.common.collect.testing.features.CollectionSize.ZERO; 023 024import com.google.common.annotations.GwtCompatible; 025import com.google.common.collect.testing.features.CollectionFeature; 026import com.google.common.collect.testing.features.CollectionSize; 027import org.junit.Ignore; 028 029/** 030 * A generic JUnit test which tests {@code peek()} operations on a queue. Can't be invoked directly; 031 * please see {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}. 032 * 033 * @author Jared Levy 034 */ 035@GwtCompatible 036@Ignore("test runners must not instantiate and run this directly, only via suites we build") 037// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests. 038@SuppressWarnings("JUnit4ClassUsedInJUnit3") 039public class QueuePeekTester<E> extends AbstractQueueTester<E> { 040 @CollectionSize.Require(ZERO) 041 public void testPeek_empty() { 042 assertNull("emptyQueue.peek() should return null", getQueue().peek()); 043 expectUnchanged(); 044 } 045 046 @CollectionSize.Require(ONE) 047 public void testPeek_size1() { 048 assertEquals("size1Queue.peek() should return first element", e0(), getQueue().peek()); 049 expectUnchanged(); 050 } 051 052 @CollectionFeature.Require(KNOWN_ORDER) 053 @CollectionSize.Require(SEVERAL) 054 public void testPeek_sizeMany() { 055 assertEquals("sizeManyQueue.peek() should return first element", e0(), getQueue().peek()); 056 expectUnchanged(); 057 } 058}