17dd252788645e940eada959bdde927426e2531c9Paul Duffin/* 27dd252788645e940eada959bdde927426e2531c9Paul Duffin * Copyright (C) 2008 The Guava Authors 37dd252788645e940eada959bdde927426e2531c9Paul Duffin * 47dd252788645e940eada959bdde927426e2531c9Paul Duffin * Licensed under the Apache License, Version 2.0 (the "License"); 57dd252788645e940eada959bdde927426e2531c9Paul Duffin * you may not use this file except in compliance with the License. 67dd252788645e940eada959bdde927426e2531c9Paul Duffin * You may obtain a copy of the License at 77dd252788645e940eada959bdde927426e2531c9Paul Duffin * 87dd252788645e940eada959bdde927426e2531c9Paul Duffin * http://www.apache.org/licenses/LICENSE-2.0 97dd252788645e940eada959bdde927426e2531c9Paul Duffin * 107dd252788645e940eada959bdde927426e2531c9Paul Duffin * Unless required by applicable law or agreed to in writing, software 117dd252788645e940eada959bdde927426e2531c9Paul Duffin * distributed under the License is distributed on an "AS IS" BASIS, 127dd252788645e940eada959bdde927426e2531c9Paul Duffin * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 137dd252788645e940eada959bdde927426e2531c9Paul Duffin * See the License for the specific language governing permissions and 147dd252788645e940eada959bdde927426e2531c9Paul Duffin * limitations under the License. 157dd252788645e940eada959bdde927426e2531c9Paul Duffin */ 167dd252788645e940eada959bdde927426e2531c9Paul Duffin 177dd252788645e940eada959bdde927426e2531c9Paul Duffinpackage com.google.common.collect.testing.testers; 187dd252788645e940eada959bdde927426e2531c9Paul Duffin 197dd252788645e940eada959bdde927426e2531c9Paul Duffinimport com.google.common.annotations.GwtCompatible; 207dd252788645e940eada959bdde927426e2531c9Paul Duffin 217dd252788645e940eada959bdde927426e2531c9Paul Duffin/** 227dd252788645e940eada959bdde927426e2531c9Paul Duffin * Tests {@link java.util.List#hashCode}. 237dd252788645e940eada959bdde927426e2531c9Paul Duffin * 247dd252788645e940eada959bdde927426e2531c9Paul Duffin * @author George van den Driessche 257dd252788645e940eada959bdde927426e2531c9Paul Duffin */ 267dd252788645e940eada959bdde927426e2531c9Paul Duffin@GwtCompatible(emulated = true) 277dd252788645e940eada959bdde927426e2531c9Paul Duffinpublic class ListHashCodeTester<E> extends AbstractListTester<E> { 287dd252788645e940eada959bdde927426e2531c9Paul Duffin public void testHashCode() { 297dd252788645e940eada959bdde927426e2531c9Paul Duffin int expectedHashCode = 1; 307dd252788645e940eada959bdde927426e2531c9Paul Duffin for (E element : getOrderedElements()) { 317dd252788645e940eada959bdde927426e2531c9Paul Duffin expectedHashCode = 31 * expectedHashCode + 327dd252788645e940eada959bdde927426e2531c9Paul Duffin ((element == null) ? 0 : element.hashCode()); 337dd252788645e940eada959bdde927426e2531c9Paul Duffin } 347dd252788645e940eada959bdde927426e2531c9Paul Duffin assertEquals( 357dd252788645e940eada959bdde927426e2531c9Paul Duffin "A List's hashCode() should be computed from those of its elements.", 367dd252788645e940eada959bdde927426e2531c9Paul Duffin expectedHashCode, getList().hashCode()); 377dd252788645e940eada959bdde927426e2531c9Paul Duffin } 387dd252788645e940eada959bdde927426e2531c9Paul Duffin} 397dd252788645e940eada959bdde927426e2531c9Paul Duffin 40