testlist.java

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/*
 * Copyright 1999-2004 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.io.IOException;
import java.io.Serializable;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.AbstractCollection;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.ConcurrentModificationException;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.NoSuchElementException;


/**
 * Tests base {@link java.util.List} methods and contracts.
 * <p>
 * To use, simply extend this class, and implement
 * the {@link #makeList} method.
 * <p>
 * If your {@link List} fails one of these tests by design,
 * you may still use this base set of cases.  Simply override the
 * test case (method) your {@link List} fails.
 *
 * @author Rodney Waldhoff
 * @author Paul Jack
 * @version $Id: TestList.java,v 1.13.2.1 2004/05/22 12:14:05 scolebourne Exp $
 */
public abstract class TestList extends TestCollection {


    public TestList(String testName) {
        super(testName);
    }


    /**
     *  Return a new, empty {@link List} to be used for testing.
     *
     *  @return an empty list for testing.
     */
    protected abstract List makeEmptyList();


    /**
     *  Return a new, full {@link List} to be used for testing.
     *
     *  @return a full list for testing
     */
    protected List makeFullList() {
        // only works if list supports optional "addAll(Collection)" 
        List list = makeEmptyList();
        list.addAll(Arrays.asList(getFullElements()));
        return list;
    }


    /**
     *  Returns {@link makeEmptyList()}.
     *
     *  @return an empty list to be used for testing
     */
    final protected Collection makeCollection() {
        return makeEmptyList();
    }


    /**
     *  Returns {@link makeFullList()}.
     *
     *  @return a full list to be used for testing
     */
    final protected Collection makeFullCollection() {
        return makeFullList();
    }


    /**
     *  Returns the {@link collection} field cast to a {@link List}.
     *
     *  @return the collection field as a List
     */
    protected List getList() {
        return (List)collection;
    } 


    /**
     *  Returns the {@link confirmed} field cast to a {@link List}.
     *
     *  @return the confirmed field as a List
     */
    protected List getConfirmedList() {
        return (List)confirmed;
    }


    /**
     *  Tests bounds checking for {@link List#add(int, Object)} on an
     *  empty list.
     */
    public void testListAddByIndexBoundsChecking() {
        if (!isAddSupported()) return;

        List list = makeEmptyList();
        Object element = getOtherElements()[0];

        try {
            list.add(Integer.MIN_VALUE, element);
            fail("List.add should throw IndexOutOfBoundsException " +
              "[Integer.MIN_VALUE]");
        } catch(IndexOutOfBoundsException e) {
            // expected
        }

        try {
            list.add(-1, element);
            fail("List.add should throw IndexOutOfBoundsException [-1]");
        } catch(IndexOutOfBoundsException e) {
            // expected
        }

        try {
            list.add(1, element);
            fail("List.add should throw IndexOutOfBoundsException [1]");
        } catch(IndexOutOfBoundsException e) {
            // expected
        }

        try {
            list.add(Integer.MAX_VALUE, element);
            fail("List.add should throw IndexOutOfBoundsException " + 
              "[Integer.MAX_VALUE]");
        } catch(IndexOutOfBoundsException e) {
            // expected
        }
    }


    /**
     *  Tests bounds checking for {@link List#add(int, Object)} on a
     *  full list.
     */
    public void testListAddByIndexBoundsChecking2() {
        if (!isAddSupported()) return;

        List list = makeFullList();
        Object element = getOtherElements()[0];

        try {
            list.add(Integer.MIN_VALUE, element);
            fail("List.add should throw IndexOutOfBoundsException " +
              "[Integer.MIN_VALUE]");
        } catch(IndexOutOfBoundsException e) {
            // expected
        }

        try {
            list.add(-1, element);
            fail("List.add should throw IndexOutOfBoundsException [-1]");
        } catch(IndexOutOfBoundsException e) {
            // expected
        }

        try {
            list.add(list.size() + 1, element);
            fail("List.add should throw IndexOutOfBoundsException [size + 1]");
        } catch(IndexOutOfBoundsException e) {
            // expected
        }

        try {
            list.add(Integer.MAX_VALUE, element);
            fail("List.add should throw IndexOutOfBoundsException " + 
              "[Integer.MAX_VALUE]");
        } catch(IndexOutOfBoundsException e) {
            // expected
        }

    }


    /**
     *  Tests {@link List#add(int,Object)}.
     */
    public void testListAddByIndex() {
        if (!isAddSupported()) return;

        Object element = getOtherElements()[0];
        int max = getFullElements().length;

        for (int i = 0; i <= max; i++) {
            resetFull();
            ((List)collection).add(i, element);
            ((List)confirmed).add(i, element);
            verify();
        }
    }


    /**
     *  Tests {@link List#equals(Object)}.
     */
    public void testListEquals() {
        resetEmpty();
        List list = getList();
        assertTrue("Empty lists should be equal", list.equals(confirmed));
        verify();
        assertTrue("Empty list should equal self", list.equals(list));
        verify();

        List list2 = Arrays.asList(getFullElements());
        assertTrue("Empty list shouldn't equal full", !list.equals(list2));
        verify();

        list2 = Arrays.asList(getOtherElements());
        assertTrue("Empty list shouldn't equal other", !list.equals(list2));
        verify();

        resetFull();
        list = getList();
        assertTrue("Full lists should be equal", list.equals(confirmed));
        verify();
        assertTrue("Full list should equal self", list.equals(list));
        verify();

        list2 = makeEmptyList();
        assertTrue("Full list shouldn't equal empty", !list.equals(list2));
        verify();

        list2 = Arrays.asList(getOtherElements());
        assertTrue("Full list shouldn't equal other", !list.equals(list2));
        verify();

        list2 = Arrays.asList(getFullElements());
        Collections.reverse(list2);
        assertTrue("Full list shouldn't equal full list with same elements" +
          " but different order", !list.equals(list2));
        verify();

        assertTrue("List shouldn't equal String", !list.equals(""));
        verify();

        final List listForC = Arrays.asList(getFullElements());
        Collection c = new AbstractCollection() {
            public int size() {
                return listForC.size();
            }

            public Iterator iterator() {
                return listForC.iterator();
            }
        };

        assertTrue("List shouldn't equal nonlist with same elements " +
          " in same order", !list.equals(c));
        verify();
    }


    /**
     *  Tests {@link List#hashCode()}.
     */
    public void testListHashCode() {
        resetEmpty();
        int hash1 = collection.hashCode();
        int hash2 = confirmed.hashCode();
        assertEquals("Empty lists should have equal hashCodes", hash1, hash2);
        verify();

        resetFull();
        hash1 = collection.hashCode();
        hash2 = confirmed.hashCode();
        assertEquals("Full lists should have equal hashCodes", hash1, hash2);
        verify();
    }


    /**
     *  Tests {@link List#get(int)}.
     */
    public void testListGetByIndex() {
        resetFull();
        List list = getList();
        Object[] elements = getFullElements();
        for (int i = 0; i < elements.length; i++) {
            assertEquals("List should contain correct elements", 
              elements[i], list.get(i));
            verify();
        }
    }


    /**
     *  Tests bounds checking for {@link List#get(int)} on an
     *  empty list.
     */
    public void testListGetByIndexBoundsChecking() {
        List list = makeEmptyList();

        try {
            list.get(Integer.MIN_VALUE);
            fail("List.get should throw IndexOutOfBoundsException " +
              "[Integer.MIN_VALUE]");
        } catch(IndexOutOfBoundsException e) {
            // expected
        }

        try {
            list.get(-1);
            fail("List.get should throw IndexOutOfBoundsException [-1]");
        } catch(IndexOutOfBoundsException e) {
            // expected
        }

        try {
            list.get(0);
            fail("List.get should throw IndexOutOfBoundsException [0]");
        } catch(IndexOutOfBoundsException e) {
            // expected
        }

        try {
            list.get(1);
            fail("List.get should throw IndexOutOfBoundsException [1]");
        } catch(IndexOutOfBoundsException e) {
            // expected
        }

        try {
            list.get(Integer.MAX_VALUE);
            fail("List.get should throw IndexOutOfBoundsException " +
              "[Integer.MAX_VALUE]");
        } catch(IndexOutOfBoundsException e) {
            // expected
        }
    }


    /**
     *  Tests bounds checking for {@link List#get(int)} on a
     *  full list.
     */
    public void testListGetByIndexBoundsChecking2() {
        List list = makeFullList();

        try {
            list.get(Integer.MIN_VALUE);
            fail("List.get should throw IndexOutOfBoundsException " + 
              "[Integer.MIN_VALUE]");
        } catch(IndexOutOfBoundsException e) {
            // expected
        }

        try {
            list.get(-1);
            fail("List.get should throw IndexOutOfBoundsException [-1]");
        } catch(IndexOutOfBoundsException e) {