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 17package com.google.common.collect.testing.testers; 18 19import com.google.common.annotations.GwtCompatible; 20 21/** 22 * Tests {@link java.util.List#hashCode}. 23 * 24 * @author George van den Driessche 25 */ 26@GwtCompatible(emulated = true) 27public class ListHashCodeTester<E> extends AbstractListTester<E> { 28 public void testHashCode() { 29 int expectedHashCode = 1; 30 for (E element : getOrderedElements()) { 31 expectedHashCode = 31 * expectedHashCode + 32 ((element == null) ? 0 : element.hashCode()); 33 } 34 assertEquals( 35 "A List's hashCode() should be computed from those of its elements.", 36 expectedHashCode, getList().hashCode()); 37 } 38} 39 40