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.CollectionSize.ONE; 21 import static com.google.common.collect.testing.features.CollectionSize.SEVERAL; 22 import static com.google.common.collect.testing.features.CollectionSize.ZERO; 23 24 import com.google.common.collect.testing.features.CollectionFeature; 25 import com.google.common.collect.testing.features.CollectionSize; 26 27 import java.util.NoSuchElementException; 28 29 /** 30 * A generic JUnit test which tests {@code element()} 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 public class QueueElementTester<E> extends AbstractQueueTester<E> { 39 @CollectionSize.Require(ZERO) 40 public void testElement_empty() { 41 try { 42 getQueue().element(); 43 fail("emptyQueue.element() should throw"); 44 } catch (NoSuchElementException expected) {} 45 expectUnchanged(); 46 } 47 48 @CollectionSize.Require(ONE) 49 public void testElement_size1() { 50 assertEquals("size1Queue.element() should return first element", 51 samples.e0, getQueue().element()); 52 expectUnchanged(); 53 } 54 55 @CollectionFeature.Require(KNOWN_ORDER) 56 @CollectionSize.Require(SEVERAL) 57 public void testElement_sizeMany() { 58 assertEquals("sizeManyQueue.element() should return first element", 59 samples.e0, getQueue().element()); 60 expectUnchanged(); 61 } 62 } 63
