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 com.google.common.collect.testing.AbstractCollectionTester; 20 import com.google.common.collect.testing.Helpers; 21 22 import java.util.Collection; 23 import java.util.List; 24 25 /** 26 * Base class for list testers. 27 * 28 * <p>This class is GWT compatible. 29 * 30 * @author George van den Driessche 31 */ 32 public class AbstractListTester<E> extends AbstractCollectionTester<E> { 33 /* 34 * Previously we had a field named list that was initialized to the value of 35 * collection in setUp(), but that caused problems when a tester changed the 36 * value of list or collection but not both. 37 */ 38 protected final List<E> getList() { 39 return (List<E>) collection; 40 } 41 42 /** 43 * {@inheritDoc} 44 * <p> 45 * The {@code AbstractListTester} implementation overrides 46 * {@link AbstractCollectionTester#expectContents(Collection)} to verify that 47 * the order of the elements in the list under test matches what is expected. 48 */ 49 @Override protected void expectContents(Collection<E> expectedCollection) { 50 List<E> expectedList = Helpers.copyToList(expectedCollection); 51 // Avoid expectEquals() here to delay reason manufacture until necessary. 52 if (getList().size() != expectedList.size()) { 53 fail("size mismatch: " + reportContext(expectedList)); 54 } 55 for (int i = 0; i < expectedList.size(); i++) { 56 E expected = expectedList.get(i); 57 E actual = getList().get(i); 58 if (expected != actual && 59 (expected == null || !expected.equals(actual))) { 60 fail("mismatch at index " + i + ": " + reportContext(expectedList)); 61 } 62 } 63 } 64 65 /** 66 * Used to delay string formatting until actually required, as it 67 * otherwise shows up in the test execution profile when running an 68 * extremely large numbers of tests. 69 */ 70 private String reportContext(List<E> expected) { 71 return Platform.format("expected collection %s; actual collection %s", 72 expected, this.collection); 73 } 74 } 75
