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The source code/* * Copyright 2001-2004 The Apache Software Foundation * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.commons.collections; import java.util.ArrayList; import java.util.Arrays; import java.util.Collection; import java.util.List; import junit.framework.Test; import org.apache.commons.collections.list.PredicatedList; /** * Tests for ListUtils. * * @version $Revision: 1.19 $ $Date: 2004/06/02 22:12:14 $ * * @author Stephen Colebourne * @author Neil O'Toole * @author Matthew Hawthorne */ public class TestListUtils extends BulkTest { public TestListUtils(String name) { super(name); } public static Test suite() { return BulkTest.makeSuite(TestListUtils.class); } public void testNothing() { } public void testpredicatedList() { Predicate predicate = new Predicate() { public boolean evaluate(Object o) { return o instanceof String; } }; List list = ListUtils.predicatedList(new ArrayStack(), predicate); assertTrue("returned object should be a PredicatedList", list instanceof PredicatedList); try { list = ListUtils.predicatedList(new ArrayStack(), null); fail("Expecting IllegalArgumentException for null predicate."); } catch (IllegalArgumentException ex) { // expected } try { list = ListUtils.predicatedList(null, predicate); fail("Expecting IllegalArgumentException for null list."); } catch (IllegalArgumentException ex) { // expected } } public void testLazyList() { List list = ListUtils.lazyList(new ArrayList(), new Factory() { private int index; public Object create() { index++; return new Integer(index); } }); assertNotNull((Integer)list.get(5)); assertEquals(6, list.size()); assertNotNull((Integer)list.get(5)); assertEquals(6, list.size()); } public void testEquals() { Collection data = Arrays.asList( new String[] { "a", "b", "c" }); List a = new ArrayList( data ); List b = new ArrayList( data ); assertEquals(true, a.equals(b)); assertEquals(true, ListUtils.isEqualList(a, b)); a.clear(); assertEquals(false, ListUtils.isEqualList(a, b)); assertEquals(false, ListUtils.isEqualList(a, null)); assertEquals(false, ListUtils.isEqualList(null, b)); assertEquals(true, ListUtils.isEqualList(null, null)); } public void testHashCode() { Collection data = Arrays.asList( new String[] { "a", "b", "c" }); List a = new ArrayList( data ); List b = new ArrayList( data ); assertEquals(true, a.hashCode() == b.hashCode()); assertEquals(true, a.hashCode() == ListUtils.hashCodeForList(a)); assertEquals(true, b.hashCode() == ListUtils.hashCodeForList(b)); assertEquals(true, ListUtils.hashCodeForList(a) == ListUtils.hashCodeForList(b)); a.clear(); assertEquals(false, ListUtils.hashCodeForList(a) == ListUtils.hashCodeForList(b)); assertEquals(0, ListUtils.hashCodeForList(null)); } } |
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