mirror of
https://github.com/haraldk/TwelveMonkeys.git
synced 2026-04-30 00:00:01 -04:00
Added test cases + fixed some hard to find bugs.
This commit is contained in:
Harald Kuhr
@@ -0,0 +1,483 @@
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/*
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* Copyright (c) 2012, Harald Kuhr
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name "TwelveMonkeys" nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package com.twelvemonkeys.util;
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import org.junit.Ignore;
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import org.junit.Test;
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import java.util.*;
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import static org.junit.Assert.*;
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import static org.junit.Assert.assertEquals;
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/**
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* CollectionUtilTest
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*
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* @author <a href="mailto:harald.kuhr@gmail.com">Harald Kuhr</a>
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* @author last modified by $Author: haraldk$
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* @version $Id: CollectionUtilTest.java,v 1.0 24.01.12 17:39 haraldk Exp$
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*/
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public class CollectionUtilTest {
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private static final Object[] stringObjects = new Object[] {"foo", "bar", "baz"};
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private static final Object[] integerObjects = new Object[] {1, 2, 3};
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@Test
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public void testMergeArraysObject() {
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Object[] merged = (Object[]) CollectionUtil.mergeArrays(stringObjects, integerObjects);
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assertArrayEquals(new Object[] {"foo", "bar", "baz", 1, 2, 3}, merged);
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}
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@Test
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public void testMergeArraysObjectOffset() {
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Object[] merged = (Object[]) CollectionUtil.mergeArrays(stringObjects, 1, 2, integerObjects, 2, 1);
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assertArrayEquals(new Object[] {"bar", "baz", 3}, merged);
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}
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@Test(expected = IndexOutOfBoundsException.class)
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public void testMergeArraysObjectBadOffset() {
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CollectionUtil.mergeArrays(stringObjects, 4, 2, integerObjects, 2, 1);
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}
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@Test(expected = IndexOutOfBoundsException.class)
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public void testMergeArraysObjectBadSecondOffset() {
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CollectionUtil.mergeArrays(stringObjects, 1, 2, integerObjects, 4, 1);
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}
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@Test(expected = IndexOutOfBoundsException.class)
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public void testMergeArraysObjectBadLength() {
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CollectionUtil.mergeArrays(stringObjects, 1, 4, integerObjects, 2, 1);
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}
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@Test(expected = IndexOutOfBoundsException.class)
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public void testMergeArraysObjectBadSecondLength() {
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CollectionUtil.mergeArrays(stringObjects, 1, 2, integerObjects, 2, 2);
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}
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@Test(expected = IndexOutOfBoundsException.class)
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public void testMergeArraysObjectNegativeOffset() {
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CollectionUtil.mergeArrays(stringObjects, -1, 2, integerObjects, 2, 1);
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}
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@Test(expected = IndexOutOfBoundsException.class)
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public void testMergeArraysObjectNegativeSecondOffset() {
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CollectionUtil.mergeArrays(stringObjects, 1, 2, integerObjects, -1, 1);
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}
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@Test(expected = IndexOutOfBoundsException.class)
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public void testMergeArraysObjectNegativeLength() {
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CollectionUtil.mergeArrays(stringObjects, 1, -1, integerObjects, 2, 1);
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}
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@Test(expected = IndexOutOfBoundsException.class)
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public void testMergeArraysObjectNegativeSecondLength() {
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CollectionUtil.mergeArrays(stringObjects, 1, 2, integerObjects, 2, -1);
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}
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@Test
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public void testMergeArraysObjectAssignable() {
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Integer[] integers = {1, 2, 3}; // Integer assignable to Object
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Object[] merged = (Object[]) CollectionUtil.mergeArrays(stringObjects, integers);
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assertArrayEquals(new Object[] {"foo", "bar", "baz", 1, 2, 3}, merged);
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}
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@Test(expected = ArrayStoreException.class)
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public void testMergeArraysObjectIllegalType() {
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String[] strings = {"foo", "bar", "baz"};
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Integer[] integers = {1, 2, 3}; // Integer not assignable to String
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CollectionUtil.mergeArrays(strings, integers);
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}
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@Test(expected = ArrayStoreException.class)
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public void testMergeArraysNativeIllegalType() {
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char[] chars = {'a', 'b', 'c'};
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int[] integers = {1, 2, 3}; // Integer not assignable to String
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CollectionUtil.mergeArrays(chars, integers);
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}
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@Test
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public void testMergeArraysNative() {
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char[] chars = {'a', 'b', 'c'};
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char[] more = {'x', 'y', 'z'};
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char[] merged = (char[]) CollectionUtil.mergeArrays(chars, more);
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assertArrayEquals(new char[] {'a', 'b', 'c', 'x', 'y', 'z'}, merged);
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}
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@Test
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public void testSubArrayObject() {
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String[] strings = CollectionUtil.subArray(new String[] {"foo", "bar", "baz", "xyzzy"}, 1, 2);
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assertArrayEquals(new String[] {"bar", "baz"}, strings);
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}
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@Test
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public void testSubArrayNative() {
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int[] numbers = (int[]) CollectionUtil.subArray(new int[] {1, 2, 3, 4, 5}, 1, 3);
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assertArrayEquals(new int[] {2, 3, 4}, numbers);
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}
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@Test(expected = IllegalArgumentException.class)
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public void testEnumIteratorNull() {
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CollectionUtil.iterator((Enumeration<Object>) null);
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}
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@Test
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public void testEnumIterator() {
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@SuppressWarnings("unchecked")
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Iterator<String> iterator = CollectionUtil.iterator((Enumeration) new StringTokenizer("foo, bar, baz", ", "));
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int count = 0;
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for (Object stringObject : stringObjects) {
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assertTrue(iterator.hasNext());
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assertEquals(stringObject, iterator.next());
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try {
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iterator.remove();
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fail("Enumeration has no remove method, iterator.remove() must throw exception");
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}
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catch (UnsupportedOperationException expected) {
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}
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count++;
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}
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assertEquals(3, count);
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assertFalse(iterator.hasNext());
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try {
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iterator.next();
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fail("Iterator has more elements than enumeration");
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}
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catch (NoSuchElementException expected) {
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}
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}
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@Test(expected = IllegalArgumentException.class)
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public void testArrayIteratorNull() {
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CollectionUtil.iterator((Object[]) null);
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}
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@Test
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public void testArrayIterator() {
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Iterator<String> iterator = CollectionUtil.iterator(new String[] {"foo", "bar", "baz"});
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int count = 0;
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for (Object stringObject : stringObjects) {
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assertTrue(iterator.hasNext());
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assertEquals(stringObject, iterator.next());
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try {
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iterator.remove();
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fail("Array have fixed length, iterator.remove() must throw exception");
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}
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catch (UnsupportedOperationException expected) {
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}
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count++;
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}
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assertEquals(3, count);
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assertFalse(iterator.hasNext());
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try {
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iterator.next();
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fail("Iterator has more elements than array");
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}
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catch (NoSuchElementException expected) {
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}
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}
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@Test
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public void testArrayListIterator() {
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assertCorrectListIterator(CollectionUtil.iterator(new String[] {"foo", "bar", "baz"}), stringObjects);
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}
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@Test
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public void testArrayListIteratorRange() {
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assertCorrectListIterator(CollectionUtil.iterator(new String[] {"foo", "bar", "baz", "boo"}, 1, 2), new String[] {"bar", "baz"});
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}
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@Test
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public void testArrayListIteratorSanityCheckArraysAsList() {
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assertCorrectListIterator(Arrays.asList(new String[] {"foo", "bar", "baz"}).listIterator(), stringObjects);
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}
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@Test
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public void testArrayListIteratorSanityCheckArraysAsListRange() {
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// NOTE: sublist(fromInc, toExcl) vs iterator(start, length)
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assertCorrectListIterator(Arrays.asList(new String[] {"foo", "bar", "baz", "boo"}).subList(1, 3).listIterator(0), new String[] {"bar", "baz"}, false, true);
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}
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@Test
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public void testArrayListIteratorSanityCheckArraysList() {
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assertCorrectListIterator(new ArrayList<String>(Arrays.asList(new String[] {"foo", "bar", "baz"})).listIterator(), stringObjects, true, true);
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}
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@Test
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public void testArrayListIteratorSanityCheckArraysListRange() {
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// NOTE: sublist(fromInc, toExcl) vs iterator(start, length)
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assertCorrectListIterator(new ArrayList<String>(Arrays.asList(new String[] {"foo", "bar", "baz", "boo"})).subList(1, 3).listIterator(0), new String[] {"bar", "baz"}, true, true);
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}
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private void assertCorrectListIterator(ListIterator<String> iterator, final Object[] elements) {
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assertCorrectListIterator(iterator, elements, false, false);
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}
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// NOTE: The test is can only test list iterators with a starting index == 0
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private void assertCorrectListIterator(ListIterator<String> iterator, final Object[] elements, boolean skipRemove, boolean skipAdd) {
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// Index is now "before 0"
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assertEquals(-1, iterator.previousIndex());
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assertEquals(0, iterator.nextIndex());
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int count = 0;
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for (Object element : elements) {
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assertTrue("No next element for element '" + element + "' at index: " + count, iterator.hasNext());
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assertEquals(count > 0, iterator.hasPrevious());
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assertEquals(count, iterator.nextIndex());
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assertEquals(count - 1, iterator.previousIndex());
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assertEquals(element, iterator.next());
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count++;
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if (!skipRemove) {
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try {
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iterator.remove();
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fail("Array has fixed length, iterator.remove() must throw exception");
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}
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catch (UnsupportedOperationException expected) {
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}
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// Verify cursor not moving
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assertEquals(count, iterator.nextIndex());
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assertEquals(count - 1, iterator.previousIndex());
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}
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// NOTE: AbstractlList.ListItr.add() moves cursor forward, even if backing list's add() throws Exception
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// (coll) AbstractList.ListItr.add might corrupt iterator state if enclosing add throws
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// See: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6533203, fixed in Java 7
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if (!skipAdd && !("java.util.AbstractList$ListItr".equals(iterator.getClass().getName()) /* && isJava7OrLater() */)) {
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try {
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iterator.add("xyzzy");
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fail("Array has fixed length, iterator.add() must throw exception");
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}
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catch (UnsupportedOperationException expected) {
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}
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// Verify cursor not moving
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assertEquals(count, iterator.nextIndex());
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assertEquals(count - 1, iterator.previousIndex());
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}
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// Set is supported
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iterator.set(String.valueOf(count));
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}
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assertEquals(elements.length, count);
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assertFalse(iterator.hasNext());
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try {
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iterator.next();
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fail("Iterator has more elements than array");
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}
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catch (NoSuchElementException expected) {
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}
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// Index should now be "before last"
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assertEquals(elements.length - 1, iterator.previousIndex());
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assertEquals(elements.length, iterator.nextIndex());
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for (int i = count; i > 0; i--) {
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assertTrue("No previous element for element '" + elements[i - 1] + "' at index: " + (i - 1), iterator.hasPrevious());
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assertEquals(i < elements.length, iterator.hasNext());
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assertEquals(i - 1, iterator.previousIndex());
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assertEquals(i, iterator.nextIndex());
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assertEquals(String.valueOf(i), iterator.previous());
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}
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// Index should now be back "before 0"
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assertEquals(-1, iterator.previousIndex());
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assertEquals(0, iterator.nextIndex());
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assertFalse(iterator.hasPrevious());
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try {
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iterator.previous();
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fail("Iterator has more elements than array");
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}
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catch (NoSuchElementException expected) {
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}
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}
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@Test(expected = IllegalArgumentException.class)
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public void testArrayIteratorRangeNull() {
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CollectionUtil.iterator(null, 0, 0);
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}
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@Test(expected = IllegalArgumentException.class)
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public void testArrayIteratorRangeBadStart() {
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CollectionUtil.iterator(stringObjects, stringObjects.length + 1, 2);
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}
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@Test(expected = IllegalArgumentException.class)
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public void testArrayIteratorRangeBadLength() {
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CollectionUtil.iterator(stringObjects, 1, stringObjects.length);
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}
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@Test
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public void testArrayIteratorRange() {
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Iterator<String> iterator = CollectionUtil.iterator(new String[] {"foo", "bar", "baz", "xyzzy"}, 1, 2);
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for (int i = 1; i < 3; i++) {
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assertTrue(iterator.hasNext());
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assertEquals(stringObjects[i], iterator.next());
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try {
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iterator.remove();
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fail("Array has no remove method, iterator.remove() must throw exception");
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}
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catch (UnsupportedOperationException expected) {
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}
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}
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assertFalse(iterator.hasNext());
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try {
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iterator.next();
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fail("Iterator has more elements than array range");
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}
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catch (NoSuchElementException expected) {
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}
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}
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@Test(expected = IllegalArgumentException.class)
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public void testReverseOrderNull() {
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CollectionUtil.reverseOrder(null);
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}
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@Test
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public void testReverseOrder() {
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Comparator<String> naturalOrder = new NaturalOrder<String>();
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Comparator<String> reverse = CollectionUtil.reverseOrder(naturalOrder);
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assertNotNull(reverse);
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assertEquals(0, naturalOrder.compare("foo", "foo"));
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assertEquals(0, reverse.compare("foo", "foo"));
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assertTrue(naturalOrder.compare("bar", "baz") < 0);
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assertTrue(reverse.compare("bar", "baz") > 0);
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assertTrue(naturalOrder.compare("baz", "bar") > 0);
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assertTrue(reverse.compare("baz", "bar") < 0);
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}
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@Test
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public void testReverseOrderRandomIntegers() {
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Comparator<Integer> naturalOrder = new NaturalOrder<Integer>();
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Comparator<Integer> reverse = CollectionUtil.reverseOrder(naturalOrder);
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Random random = new Random(243249878l); // Stable "random" sequence
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for (int i = 0; i < 65536; i++) {
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// Verified to be ~ 50/50 lt/gt
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int integer = random.nextInt();
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int integerToo = random.nextInt();
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assertEquals(0, reverse.compare(integer, integer));
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assertEquals(0, reverse.compare(integerToo, integerToo));
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int natural = naturalOrder.compare(integer, integerToo);
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if (natural == 0) {
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// Actually never hits, but eq case is tested above
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assertEquals(0, reverse.compare(integer, integerToo));
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}
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else if (natural < 0) {
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assertTrue(reverse.compare(integer, integerToo) > 0);
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}
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else {
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assertTrue(reverse.compare(integer, integerToo) < 0);
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}
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}
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}
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@Ignore("For development only")
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@Test
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@SuppressWarnings({"UnusedDeclaration"})
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public void testGenerify() {
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List list = Collections.singletonList("foo");
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@SuppressWarnings({"unchecked"})
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Set set = new HashSet(list);
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List<String> strs0 = CollectionUtil.generify(list, String.class);
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List<Object> objs0 = CollectionUtil.generify(list, String.class);
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// List<String> strs01 = CollectionUtil.generify(list, Object.class); // Not okay
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try {
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List<String> strs1 = CollectionUtil.generify(set, String.class); // Not ok, runtime CCE unless set is null
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}
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catch (RuntimeException e) {
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e.printStackTrace();
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}
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try {
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ArrayList<String> strs01 = CollectionUtil.generify(list, String.class); // Not ok, runtime CCE unless list is null
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}
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catch (RuntimeException e) {
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e.printStackTrace();
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}
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Set<String> setstr1 = CollectionUtil.generify(set, String.class);
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Set<Object> setobj1 = CollectionUtil.generify(set, String.class);
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try {
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Set<Object> setobj44 = CollectionUtil.generify(list, String.class); // Not ok, runtime CCE unless list is null
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}
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catch (RuntimeException e) {
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e.printStackTrace();
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}
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List<String> strs2 = CollectionUtil.<List<String>, String>generify2(list);
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List<Object> objs2 = CollectionUtil.<List<Object>, String>generify2(list);
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// List<String> morestrs = CollectionUtil.<List<Object>, String>generify2(list); // Not ok
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try {
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List<String> strs3 = CollectionUtil.<List<String>, String>generify2(set); // Not ok, runtime CCE unless set is null
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}
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catch (RuntimeException e) {
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e.printStackTrace();
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}
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}
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private static class NaturalOrder<T extends Comparable<T>> implements Comparator<T> {
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public int compare(T left, T right) {
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return left.compareTo(right);
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}
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||||
}
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||||
}
|
||||
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Block a user