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 java.util.NoSuchElementException; 028 029/** 030 * A generic JUnit test which tests {@code element()} operations on a queue. Can't be invoked 031 * directly; please see {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}. 032 * 033 * @author Jared Levy 034 */ 035@GwtCompatible 036public class QueueElementTester<E> extends AbstractQueueTester<E> { 037 @CollectionSize.Require(ZERO) 038 public void testElement_empty() { 039 try { 040 getQueue().element(); 041 fail("emptyQueue.element() should throw"); 042 } catch (NoSuchElementException expected) { 043 } 044 expectUnchanged(); 045 } 046 047 @CollectionSize.Require(ONE) 048 public void testElement_size1() { 049 assertEquals("size1Queue.element() should return first element", e0(), getQueue().element()); 050 expectUnchanged(); 051 } 052 053 @CollectionFeature.Require(KNOWN_ORDER) 054 @CollectionSize.Require(SEVERAL) 055 public void testElement_sizeMany() { 056 assertEquals("sizeManyQueue.element() should return first element", e0(), getQueue().element()); 057 expectUnchanged(); 058 } 059}