common/tests/org.eclipse.jpt.common.utility.tests/src/org/eclipse/jpt/common/utility/tests/internal/HashBagTests.java - dali/webtools.dali - Git at Google

 /*******************************************************************************
  * Copyright (c) 2005, 2010 Oracle. All rights reserved.
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v1.0, which accompanies this distribution
  * and is available at http://www.eclipse.org/legal/epl-v10.html.
  *
  * Contributors:
  *     Oracle - initial API and implementation
  ******************************************************************************/
 package org.eclipse.jpt.common.utility.tests.internal;

 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.ConcurrentModificationException;
 import java.util.Iterator;
 import java.util.NoSuchElementException;

 import junit.framework.TestCase;

 import org.eclipse.jpt.common.utility.internal.ArrayTools;
 import org.eclipse.jpt.common.utility.internal.Bag;
 import org.eclipse.jpt.common.utility.internal.HashBag;
 import org.eclipse.jpt.common.utility.internal.Tools;

 @SuppressWarnings("nls")
 public class HashBagTests extends TestCase {
 	private HashBag<String> bag;

 	public HashBagTests(String name) {
 		super(name);
 	}

 	@Override
 	protected void setUp() throws Exception {
 		super.setUp();
 		this.bag = this.buildBag();
 	}

 	private HashBag<String> buildBag() {
 		HashBag<String> b = new HashBag<String>();
 		b.add(null);
 		b.add(new String("one"));
 		b.add(new String("two"));
 		b.add(new String("two"));
 		b.add(new String("three"));
 		b.add(new String("three"));
 		b.add(new String("three"));
 		b.add(new String("four"));
 		b.add(new String("four"));
 		b.add(new String("four"));
 		b.add(new String("four"));
 		return b;
 	}

 	@Override
 	protected void tearDown() throws Exception {
 		TestTools.clear(this);
 		super.tearDown();
 	}

 	private Collection<String> buildCollection() {
 		Collection<String> c = new ArrayList<String>();
 		c.add(new String("foo"));
 		c.add(new String("foo"));
 		c.add(new String("bar"));
 		c.add(new String("bar"));
 		c.add(new String("bar"));
 		return c;
 	}

 	public void testCtorCollection() {
 		Collection<String> c = this.buildCollection();
 		Bag<String> b = new HashBag<String>(c);
 		for (String s : c) {
 			assertTrue(b.contains(s));
 		}
 	}

 	public void testCtorIntFloat() {
 		boolean exCaught;

 		exCaught = false;
 		try {
 			this.bag = new HashBag<String>(-20, 0.66f);
 		} catch (IllegalArgumentException ex) {
 			exCaught = true;
 		}
 		assertTrue(exCaught);

 		exCaught = false;
 		try {
 			this.bag = new HashBag<String>(20, -0.66f);
 		} catch (IllegalArgumentException ex) {
 			exCaught = true;
 		}
 		assertTrue(exCaught);
 	}

 	public void testAdd() {
 		// the other adds took place in setUp
 		assertTrue(this.bag.add("five"));

 		assertTrue(this.bag.contains("one"));
 		assertTrue(this.bag.contains("two"));
 		assertTrue(this.bag.contains("three"));
 		assertTrue(this.bag.contains("four"));
 		assertTrue(this.bag.contains("five"));
 	}

 	public void testAddCount() {
 		// the other adds took place in setUp
 		this.bag.add("minus3", -3);
 		this.bag.add("zero", 0);
 		this.bag.add("five", 5);

 		assertFalse(this.bag.contains("minus3"));
 		assertFalse(this.bag.contains("zero"));
 		assertEquals(1, this.bag.count("one"));
 		assertEquals(2, this.bag.count("two"));
 		assertEquals(3, this.bag.count("three"));
 		assertEquals(4, this.bag.count("four"));
 		assertEquals(5, this.bag.count("five"));

 		this.bag.add("three", 2);
 		assertEquals(5, this.bag.count("three"));
 	}

 	public void testAddAll() {
 		Collection<String> c = this.buildCollection();
 		assertTrue(this.bag.addAll(c));
 		for (String s : c) {
 			assertTrue(this.bag.contains(s));
 		}
 	}

 	public void testClear() {
 		assertTrue(this.bag.contains("one"));
 		assertTrue(this.bag.contains("two"));
 		assertTrue(this.bag.contains("three"));
 		assertTrue(this.bag.contains("four"));
 		assertTrue(this.bag.contains(null));
 		assertEquals(11, this.bag.size());
 		this.bag.clear();
 		assertFalse(this.bag.contains("one"));
 		assertFalse(this.bag.contains("two"));
 		assertFalse(this.bag.contains("three"));
 		assertFalse(this.bag.contains("four"));
 		assertFalse(this.bag.contains(null));
 		assertEquals(0, this.bag.size());
 	}

 	public void testClone() {
 		Bag<String> bag2 = this.bag.clone();
 		assertTrue(this.bag != bag2);
 		assertEquals(this.bag, bag2);
 		assertTrue(this.bag.hashCode() == bag2.hashCode());
 	}

 	public void testContains() {
 		assertTrue(this.bag.contains(null));
 		assertTrue(this.bag.contains("one"));
 		assertTrue(this.bag.contains("two"));
 		assertTrue(this.bag.contains("three"));
 		assertTrue(this.bag.contains("four"));
 		assertTrue(this.bag.contains(new String("four")));
 		assertTrue(this.bag.contains("fo" + "ur"));
 		assertFalse(this.bag.contains("five"));
 	}

 	public void testContainsAll() {
 		Collection<String> c = new ArrayList<String>();
 		c.add(null);
 		c.add(new String("one"));
 		c.add(new String("two"));
 		c.add(new String("three"));
 		c.add(new String("four"));
 		assertTrue(this.bag.containsAll(c));
 	}

 	public void testCount() {
 		assertEquals(0, this.bag.count("zero"));
 		assertEquals(1, this.bag.count("one"));
 		assertEquals(2, this.bag.count("two"));
 		assertEquals(3, this.bag.count("three"));
 		assertEquals(4, this.bag.count("four"));
 		assertEquals(0, this.bag.count("five"));
 	}

 	public void testEquals() {
 		Bag<String> bag2 = this.buildBag();
 		assertEquals(this.bag, bag2);
 		bag2.add("five");
 		assertFalse(this.bag.equals(bag2));
 		Collection<String> c = new ArrayList<String>(this.bag);
 		assertFalse(this.bag.equals(c));
 	}

 	public void testHashCode() {
 		Bag<String> bag2 = this.buildBag();
 		assertEquals(this.bag.hashCode(), bag2.hashCode());
 	}

 	public void testIsEmpty() {
 		assertFalse(this.bag.isEmpty());
 		this.bag.clear();
 		assertTrue(this.bag.isEmpty());
 		this.bag.add("foo");
 		assertFalse(this.bag.isEmpty());
 	}

 	public void testEmptyIterator() {
 		this.bag.clear();
 		Iterator<String> iterator = this.bag.iterator();
 		assertFalse(iterator.hasNext());

 		boolean exCaught = false;
 		Object element = null;
 		try {
 			element = iterator.next();
 			fail(element.toString());
 		} catch (NoSuchElementException ex) {
 			exCaught = true;
 		}
 		assertTrue(exCaught);

 		exCaught = false;
 		try {
 			iterator.remove();
 		} catch (IllegalStateException ex) {
 			exCaught = true;
 		}
 		assertTrue(exCaught);
 	}

 	public void testIterator() {
 		int i = 0;
 		Iterator<String> iterator = this.bag.iterator();
 		assertTrue(iterator.hasNext());
 		while (iterator.hasNext()) {
 			iterator.next();
 			i++;
 		}
 		assertEquals(11, i);
 		assertFalse(iterator.hasNext());

 		boolean exCaught = false;
 		Object element = null;
 		try {
 			element = iterator.next();
 			fail(element.toString());
 		} catch (NoSuchElementException ex) {
 			exCaught = true;
 		}
 		assertTrue(exCaught);

 		iterator.remove();
 		assertEquals(10, this.bag.size());

 		exCaught = false;
 		try {
 			iterator.remove();
 		} catch (IllegalStateException ex) {
 			exCaught = true;
 		}
 		assertTrue(exCaught);

 		// start over
 		iterator = this.bag.iterator();
 		this.bag.add("five");
 		exCaught = false;
 		try {
 			iterator.next();
 		} catch (ConcurrentModificationException ex) {
 			exCaught = true;
 		}
 		assertTrue(exCaught);
 	}

 	public void testUniqueIterator() {
 		int i = 0;
 		Iterator<String> iterator = this.bag.uniqueIterator();
 		assertTrue(iterator.hasNext());
 		while (iterator.hasNext()) {
 			iterator.next();
 			i++;
 		}
 		assertEquals(5, i);
 		assertFalse(iterator.hasNext());

 		boolean exCaught = false;
 		Object element = null;
 		try {
 			element = iterator.next();
 			fail(element.toString());
 		} catch (NoSuchElementException ex) {
 			exCaught = true;
 		}
 		assertTrue(exCaught);

 		// start over
 		iterator = this.bag.uniqueIterator();
 		Object next = null;
 		while (iterator.hasNext() && !"four".equals(next)) {
 			next = iterator.next();
 		}
 		iterator.remove();
 		assertEquals(7, this.bag.size());

 		exCaught = false;
 		try {
 			iterator.remove();
 		} catch (IllegalStateException ex) {
 			exCaught = true;
 		}
 		assertTrue(exCaught);

 		// start over
 		iterator = this.bag.uniqueIterator();
 		this.bag.add("five");
 		exCaught = false;
 		try {
 			iterator.next();
 		} catch (ConcurrentModificationException ex) {
 			exCaught = true;
 		}
 		assertTrue(exCaught);
 	}

 	public void testEntries() {
 		int i = 0;
 		Iterator<Bag.Entry<String>> iterator = this.bag.entries();
 		assertTrue(iterator.hasNext());
 		while (iterator.hasNext()) {
 			iterator.next();
 			i++;
 		}
 		assertEquals(5, i);
 		assertFalse(iterator.hasNext());

 		boolean exCaught = false;
 		Object element = null;
 		try {
 			element = iterator.next();
 			fail(element.toString());
 		} catch (NoSuchElementException ex) {
 			exCaught = true;
 		}
 		assertTrue(exCaught);

 		// start over
 		iterator = this.bag.entries();
 		Bag.Entry<String> next = null;
 		while (iterator.hasNext()) {
 			next = iterator.next();
 			if (next.getElement().equals("four")) {
 				iterator.remove();
 				break;
 			}
 		}
 		assertEquals(7, this.bag.size());

 		exCaught = false;
 		try {
 			iterator.remove();
 		} catch (IllegalStateException ex) {
 			exCaught = true;
 		}
 		assertTrue(exCaught);

 		// start over
 		iterator = this.bag.entries();
 		this.bag.add("five");
 		exCaught = false;
 		try {
 			iterator.next();
 		} catch (ConcurrentModificationException ex) {
 			exCaught = true;
 		}
 		assertTrue(exCaught);
 	}

 	public void testHashingDistribution() throws Exception {
 		Bag<String> bigBag = new HashBag<String>();
 		for (int i = 0; i < 10000; i++) {
 			bigBag.add("object" + i);
 		}

 		java.lang.reflect.Field field = bigBag.getClass().getDeclaredField("table");
 		field.setAccessible(true);
 		Object[] table = (Object[]) field.get(bigBag);
 		int bucketCount = table.length;
 		int filledBucketCount = 0;
 		for (Object o : table) {
 			if (o != null) {
 				filledBucketCount++;
 			}
 		}
 		float loadFactor = ((float) filledBucketCount) / ((float) bucketCount);
 		if ((loadFactor < 0.20) || (loadFactor > 0.80)) {
 			String msg = "poor load factor: " + loadFactor;
 			if (Tools.jvmIsSun()) {
 				fail(msg);
 			} else {
 				// poor load factor is seen in the Eclipse build environment for some reason...
 				System.out.println(this.getClass().getName() + '.' + this.getName() + " - " + msg);
 				TestTools.printSystemProperties();
 			}
 		}
 	}

 	public void testRemove() {
 		assertTrue(this.bag.remove("one"));
 		assertFalse(this.bag.contains("one"));
 		assertFalse(this.bag.remove("one"));

 		assertTrue(this.bag.remove("two"));
 		assertTrue(this.bag.remove("two"));
 		assertFalse(this.bag.contains("two"));
 		assertFalse(this.bag.remove("two"));
 	}

 	public void testRemoveCount() {
 		assertFalse(this.bag.remove("one", 0));
 		assertTrue(this.bag.contains("one"));

 		assertTrue(this.bag.remove("one", 1));
 		assertFalse(this.bag.contains("one"));
 		assertFalse(this.bag.remove("one"));

 		assertFalse(this.bag.remove("two", -3));
 		assertTrue(this.bag.remove("two", 1));
 		assertTrue(this.bag.contains("two"));

 		assertTrue(this.bag.remove("two", 1));
 		assertFalse(this.bag.contains("two"));
 		assertFalse(this.bag.remove("two"));

 		assertTrue(this.bag.remove("three", 3));
 		assertFalse(this.bag.contains("three"));
 		assertFalse(this.bag.remove("three"));
 	}

 	public void testRemoveAll() {
 		Collection<String> c = new ArrayList<String>();
 		c.add("one");
 		c.add("three");
 		assertTrue(this.bag.removeAll(c));
 		assertFalse(this.bag.contains("one"));
 		assertFalse(this.bag.contains("three"));
 		assertFalse(this.bag.remove("one"));
 		assertFalse(this.bag.remove("three"));
 		assertFalse(this.bag.removeAll(c));
 	}

 	public void testRetainAll() {
 		Collection<String> c = new ArrayList<String>();
 		c.add("one");
 		c.add("three");
 		assertTrue(this.bag.retainAll(c));
 		assertTrue(this.bag.contains("one"));
 		assertTrue(this.bag.contains("three"));
 		assertFalse(this.bag.contains("two"));
 		assertFalse(this.bag.contains("four"));
 		assertFalse(this.bag.remove("two"));
 		assertFalse(this.bag.remove("four"));
 		assertFalse(this.bag.retainAll(c));
 	}

 	public void testSize() {
 		assertTrue(this.bag.size() == 11);
 		this.bag.add("five");
 		this.bag.add("five");
 		this.bag.add("five");
 		this.bag.add("five");
 		this.bag.add("five");
 		assertEquals(16, this.bag.size());
 	}

 	public void testSerialization() throws Exception {
 		Bag<String> bag2 = TestTools.serialize(this.bag);

 		assertTrue("same object?", this.bag != bag2);
 		assertEquals(11, bag2.size());
 		assertEquals(this.bag, bag2);
 		// look for similar elements
 		assertTrue(bag2.contains(null));
 		assertTrue(bag2.contains("one"));
 		assertTrue(bag2.contains("two"));
 		assertTrue(bag2.contains("three"));
 		assertTrue(bag2.contains("four"));

 		int nullCount = 0, oneCount = 0, twoCount = 0, threeCount = 0, fourCount = 0;
 		for (String s : bag2) {
 			if (s == null) {
 				nullCount++;
 			} else if (s.equals("one")) {
 				oneCount++;
 			} else if (s.equals("two")) {
 				twoCount++;
 			} else if (s.equals("three")) {
 				threeCount++;
 			} else if (s.equals("four")) {
 				fourCount++;
 			}
 		}
 		assertEquals(1, nullCount);
 		assertEquals(1, oneCount);
 		assertEquals(2, twoCount);
 		assertEquals(3, threeCount);
 		assertEquals(4, fourCount);
 	}

 	public void testToArray() {
 		Object[] a = this.bag.toArray();
 		assertEquals(11, a.length);
 		assertTrue(ArrayTools.contains(a, null));
 		assertTrue(ArrayTools.contains(a, "one"));
 		assertTrue(ArrayTools.contains(a, "two"));
 		assertTrue(ArrayTools.contains(a, "three"));
 		assertTrue(ArrayTools.contains(a, "four"));
 	}

 	public void testToArrayObjectArray() {
 		String[] a = new String[12];
 		a[11] = "not null";
 		String[] b = this.bag.toArray(a);
 		assertEquals(a, b);
 		assertEquals(12, a.length);
 		assertTrue(ArrayTools.contains(a, null));
 		assertTrue(ArrayTools.contains(a, "one"));
 		assertTrue(ArrayTools.contains(a, "two"));
 		assertTrue(ArrayTools.contains(a, "three"));
 		assertTrue(ArrayTools.contains(a, "four"));
 		assertTrue(a[11] == null);
 	}

 	public void testToString() {
 		String s = this.bag.toString();
 		assertTrue(s.startsWith("["));
 		assertTrue(s.endsWith("]"));
 		int commaCount = 0;
 		for (int i = 0; i < s.length(); i++) {
 			if (s.charAt(i) == ',') {
 				commaCount++;
 			}
 		}
 		assertEquals(10, commaCount);
 		assertTrue(s.indexOf("one") != -1);
 		assertTrue(s.indexOf("two") != -1);
 		assertTrue(s.indexOf("three") != -1);
 		assertTrue(s.indexOf("four") != -1);
 		assertTrue(s.indexOf("null") != -1);
 	}

 }
	/*******************************************************************************
	* Copyright (c) 2005, 2010 Oracle. All rights reserved.
	* This program and the accompanying materials are made available under the
	* terms of the Eclipse Public License v1.0, which accompanies this distribution
	* and is available at http://www.eclipse.org/legal/epl-v10.html.
	*
	* Contributors:
	* Oracle - initial API and implementation
	******************************************************************************/
	package org.eclipse.jpt.common.utility.tests.internal;

	import java.util.ArrayList;
	import java.util.Collection;
	import java.util.ConcurrentModificationException;
	import java.util.Iterator;
	import java.util.NoSuchElementException;

	import junit.framework.TestCase;

	import org.eclipse.jpt.common.utility.internal.ArrayTools;
	import org.eclipse.jpt.common.utility.internal.Bag;
	import org.eclipse.jpt.common.utility.internal.HashBag;
	import org.eclipse.jpt.common.utility.internal.Tools;

	@SuppressWarnings("nls")
	public class HashBagTests extends TestCase {
	private HashBag<String> bag;

	public HashBagTests(String name) {
	super(name);
	}

	@Override
	protected void setUp() throws Exception {
	super.setUp();
	this.bag = this.buildBag();
	}

	private HashBag<String> buildBag() {
	HashBag<String> b = new HashBag<String>();
	b.add(null);
	b.add(new String("one"));
	b.add(new String("two"));
	b.add(new String("two"));
	b.add(new String("three"));
	b.add(new String("three"));
	b.add(new String("three"));
	b.add(new String("four"));
	b.add(new String("four"));
	b.add(new String("four"));
	b.add(new String("four"));
	return b;
	}

	@Override
	protected void tearDown() throws Exception {
	TestTools.clear(this);
	super.tearDown();
	}

	private Collection<String> buildCollection() {
	Collection<String> c = new ArrayList<String>();
	c.add(new String("foo"));
	c.add(new String("foo"));
	c.add(new String("bar"));
	c.add(new String("bar"));
	c.add(new String("bar"));
	return c;
	}

	public void testCtorCollection() {
	Collection<String> c = this.buildCollection();
	Bag<String> b = new HashBag<String>(c);
	for (String s : c) {
	assertTrue(b.contains(s));
	}
	}

	public void testCtorIntFloat() {
	boolean exCaught;

	exCaught = false;
	try {
	this.bag = new HashBag<String>(-20, 0.66f);
	} catch (IllegalArgumentException ex) {
	exCaught = true;
	}
	assertTrue(exCaught);

	exCaught = false;
	try {
	this.bag = new HashBag<String>(20, -0.66f);
	} catch (IllegalArgumentException ex) {
	exCaught = true;
	}
	assertTrue(exCaught);
	}

	public void testAdd() {
	// the other adds took place in setUp
	assertTrue(this.bag.add("five"));

	assertTrue(this.bag.contains("one"));
	assertTrue(this.bag.contains("two"));
	assertTrue(this.bag.contains("three"));
	assertTrue(this.bag.contains("four"));
	assertTrue(this.bag.contains("five"));
	}

	public void testAddCount() {
	// the other adds took place in setUp
	this.bag.add("minus3", -3);
	this.bag.add("zero", 0);
	this.bag.add("five", 5);

	assertFalse(this.bag.contains("minus3"));
	assertFalse(this.bag.contains("zero"));
	assertEquals(1, this.bag.count("one"));
	assertEquals(2, this.bag.count("two"));
	assertEquals(3, this.bag.count("three"));
	assertEquals(4, this.bag.count("four"));
	assertEquals(5, this.bag.count("five"));

	this.bag.add("three", 2);
	assertEquals(5, this.bag.count("three"));
	}

	public void testAddAll() {
	Collection<String> c = this.buildCollection();
	assertTrue(this.bag.addAll(c));
	for (String s : c) {
	assertTrue(this.bag.contains(s));
	}
	}

	public void testClear() {
	assertTrue(this.bag.contains("one"));
	assertTrue(this.bag.contains("two"));
	assertTrue(this.bag.contains("three"));
	assertTrue(this.bag.contains("four"));
	assertTrue(this.bag.contains(null));
	assertEquals(11, this.bag.size());
	this.bag.clear();
	assertFalse(this.bag.contains("one"));
	assertFalse(this.bag.contains("two"));
	assertFalse(this.bag.contains("three"));
	assertFalse(this.bag.contains("four"));
	assertFalse(this.bag.contains(null));
	assertEquals(0, this.bag.size());
	}

	public void testClone() {
	Bag<String> bag2 = this.bag.clone();
	assertTrue(this.bag != bag2);
	assertEquals(this.bag, bag2);
	assertTrue(this.bag.hashCode() == bag2.hashCode());
	}

	public void testContains() {
	assertTrue(this.bag.contains(null));
	assertTrue(this.bag.contains("one"));
	assertTrue(this.bag.contains("two"));
	assertTrue(this.bag.contains("three"));
	assertTrue(this.bag.contains("four"));
	assertTrue(this.bag.contains(new String("four")));
	assertTrue(this.bag.contains("fo" + "ur"));
	assertFalse(this.bag.contains("five"));
	}

	public void testContainsAll() {
	Collection<String> c = new ArrayList<String>();
	c.add(null);
	c.add(new String("one"));
	c.add(new String("two"));
	c.add(new String("three"));
	c.add(new String("four"));
	assertTrue(this.bag.containsAll(c));
	}

	public void testCount() {
	assertEquals(0, this.bag.count("zero"));
	assertEquals(1, this.bag.count("one"));
	assertEquals(2, this.bag.count("two"));
	assertEquals(3, this.bag.count("three"));
	assertEquals(4, this.bag.count("four"));
	assertEquals(0, this.bag.count("five"));
	}

	public void testEquals() {
	Bag<String> bag2 = this.buildBag();
	assertEquals(this.bag, bag2);
	bag2.add("five");
	assertFalse(this.bag.equals(bag2));
	Collection<String> c = new ArrayList<String>(this.bag);
	assertFalse(this.bag.equals(c));
	}

	public void testHashCode() {
	Bag<String> bag2 = this.buildBag();
	assertEquals(this.bag.hashCode(), bag2.hashCode());
	}

	public void testIsEmpty() {
	assertFalse(this.bag.isEmpty());
	this.bag.clear();
	assertTrue(this.bag.isEmpty());
	this.bag.add("foo");
	assertFalse(this.bag.isEmpty());
	}

	public void testEmptyIterator() {
	this.bag.clear();
	Iterator<String> iterator = this.bag.iterator();
	assertFalse(iterator.hasNext());

	boolean exCaught = false;
	Object element = null;
	try {
	element = iterator.next();
	fail(element.toString());
	} catch (NoSuchElementException ex) {
	exCaught = true;
	}
	assertTrue(exCaught);

	exCaught = false;
	try {
	iterator.remove();
	} catch (IllegalStateException ex) {
	exCaught = true;
	}
	assertTrue(exCaught);
	}

	public void testIterator() {
	int i = 0;
	Iterator<String> iterator = this.bag.iterator();
	assertTrue(iterator.hasNext());
	while (iterator.hasNext()) {
	iterator.next();
	i++;
	}
	assertEquals(11, i);
	assertFalse(iterator.hasNext());

	boolean exCaught = false;
	Object element = null;
	try {
	element = iterator.next();
	fail(element.toString());
	} catch (NoSuchElementException ex) {
	exCaught = true;
	}
	assertTrue(exCaught);

	iterator.remove();
	assertEquals(10, this.bag.size());

	exCaught = false;
	try {
	iterator.remove();
	} catch (IllegalStateException ex) {
	exCaught = true;
	}
	assertTrue(exCaught);

	// start over
	iterator = this.bag.iterator();
	this.bag.add("five");
	exCaught = false;
	try {
	iterator.next();
	} catch (ConcurrentModificationException ex) {
	exCaught = true;
	}
	assertTrue(exCaught);
	}

	public void testUniqueIterator() {
	int i = 0;
	Iterator<String> iterator = this.bag.uniqueIterator();
	assertTrue(iterator.hasNext());
	while (iterator.hasNext()) {
	iterator.next();
	i++;
	}
	assertEquals(5, i);
	assertFalse(iterator.hasNext());

	boolean exCaught = false;
	Object element = null;
	try {
	element = iterator.next();
	fail(element.toString());
	} catch (NoSuchElementException ex) {
	exCaught = true;
	}
	assertTrue(exCaught);

	// start over
	iterator = this.bag.uniqueIterator();
	Object next = null;
	while (iterator.hasNext() && !"four".equals(next)) {
	next = iterator.next();
	}
	iterator.remove();
	assertEquals(7, this.bag.size());

	exCaught = false;
	try {
	iterator.remove();
	} catch (IllegalStateException ex) {
	exCaught = true;
	}
	assertTrue(exCaught);

	// start over
	iterator = this.bag.uniqueIterator();
	this.bag.add("five");
	exCaught = false;
	try {
	iterator.next();
	} catch (ConcurrentModificationException ex) {
	exCaught = true;
	}
	assertTrue(exCaught);
	}

	public void testEntries() {
	int i = 0;
	Iterator<Bag.Entry<String>> iterator = this.bag.entries();
	assertTrue(iterator.hasNext());
	while (iterator.hasNext()) {
	iterator.next();
	i++;
	}
	assertEquals(5, i);
	assertFalse(iterator.hasNext());

	boolean exCaught = false;
	Object element = null;
	try {
	element = iterator.next();
	fail(element.toString());
	} catch (NoSuchElementException ex) {
	exCaught = true;
	}
	assertTrue(exCaught);

	// start over
	iterator = this.bag.entries();
	Bag.Entry<String> next = null;
	while (iterator.hasNext()) {
	next = iterator.next();
	if (next.getElement().equals("four")) {
	iterator.remove();
	break;
	}
	}
	assertEquals(7, this.bag.size());

	exCaught = false;
	try {
	iterator.remove();
	} catch (IllegalStateException ex) {
	exCaught = true;
	}
	assertTrue(exCaught);

	// start over
	iterator = this.bag.entries();
	this.bag.add("five");
	exCaught = false;
	try {
	iterator.next();
	} catch (ConcurrentModificationException ex) {
	exCaught = true;
	}
	assertTrue(exCaught);
	}

	public void testHashingDistribution() throws Exception {
	Bag<String> bigBag = new HashBag<String>();
	for (int i = 0; i < 10000; i++) {
	bigBag.add("object" + i);
	}

	java.lang.reflect.Field field = bigBag.getClass().getDeclaredField("table");
	field.setAccessible(true);
	Object[] table = (Object[]) field.get(bigBag);
	int bucketCount = table.length;
	int filledBucketCount = 0;
	for (Object o : table) {
	if (o != null) {
	filledBucketCount++;
	}
	}
	float loadFactor = ((float) filledBucketCount) / ((float) bucketCount);
	if ((loadFactor < 0.20) \|\| (loadFactor > 0.80)) {
	String msg = "poor load factor: " + loadFactor;
	if (Tools.jvmIsSun()) {
	fail(msg);
	} else {
	// poor load factor is seen in the Eclipse build environment for some reason...
	System.out.println(this.getClass().getName() + '.' + this.getName() + " - " + msg);
	TestTools.printSystemProperties();
	}
	}
	}

	public void testRemove() {
	assertTrue(this.bag.remove("one"));
	assertFalse(this.bag.contains("one"));
	assertFalse(this.bag.remove("one"));

	assertTrue(this.bag.remove("two"));
	assertTrue(this.bag.remove("two"));
	assertFalse(this.bag.contains("two"));
	assertFalse(this.bag.remove("two"));
	}

	public void testRemoveCount() {
	assertFalse(this.bag.remove("one", 0));
	assertTrue(this.bag.contains("one"));

	assertTrue(this.bag.remove("one", 1));
	assertFalse(this.bag.contains("one"));
	assertFalse(this.bag.remove("one"));

	assertFalse(this.bag.remove("two", -3));
	assertTrue(this.bag.remove("two", 1));
	assertTrue(this.bag.contains("two"));

	assertTrue(this.bag.remove("two", 1));
	assertFalse(this.bag.contains("two"));
	assertFalse(this.bag.remove("two"));

	assertTrue(this.bag.remove("three", 3));
	assertFalse(this.bag.contains("three"));
	assertFalse(this.bag.remove("three"));
	}

	public void testRemoveAll() {
	Collection<String> c = new ArrayList<String>();
	c.add("one");
	c.add("three");
	assertTrue(this.bag.removeAll(c));
	assertFalse(this.bag.contains("one"));
	assertFalse(this.bag.contains("three"));
	assertFalse(this.bag.remove("one"));
	assertFalse(this.bag.remove("three"));
	assertFalse(this.bag.removeAll(c));
	}

	public void testRetainAll() {
	Collection<String> c = new ArrayList<String>();
	c.add("one");
	c.add("three");
	assertTrue(this.bag.retainAll(c));
	assertTrue(this.bag.contains("one"));
	assertTrue(this.bag.contains("three"));
	assertFalse(this.bag.contains("two"));
	assertFalse(this.bag.contains("four"));
	assertFalse(this.bag.remove("two"));
	assertFalse(this.bag.remove("four"));
	assertFalse(this.bag.retainAll(c));
	}

	public void testSize() {
	assertTrue(this.bag.size() == 11);
	this.bag.add("five");
	this.bag.add("five");
	this.bag.add("five");
	this.bag.add("five");
	this.bag.add("five");
	assertEquals(16, this.bag.size());
	}

	public void testSerialization() throws Exception {
	Bag<String> bag2 = TestTools.serialize(this.bag);

	assertTrue("same object?", this.bag != bag2);
	assertEquals(11, bag2.size());
	assertEquals(this.bag, bag2);
	// look for similar elements
	assertTrue(bag2.contains(null));
	assertTrue(bag2.contains("one"));
	assertTrue(bag2.contains("two"));
	assertTrue(bag2.contains("three"));
	assertTrue(bag2.contains("four"));

	int nullCount = 0, oneCount = 0, twoCount = 0, threeCount = 0, fourCount = 0;
	for (String s : bag2) {
	if (s == null) {
	nullCount++;
	} else if (s.equals("one")) {
	oneCount++;
	} else if (s.equals("two")) {
	twoCount++;
	} else if (s.equals("three")) {
	threeCount++;
	} else if (s.equals("four")) {
	fourCount++;
	}
	}
	assertEquals(1, nullCount);
	assertEquals(1, oneCount);
	assertEquals(2, twoCount);
	assertEquals(3, threeCount);
	assertEquals(4, fourCount);
	}

	public void testToArray() {
	Object[] a = this.bag.toArray();
	assertEquals(11, a.length);
	assertTrue(ArrayTools.contains(a, null));
	assertTrue(ArrayTools.contains(a, "one"));
	assertTrue(ArrayTools.contains(a, "two"));
	assertTrue(ArrayTools.contains(a, "three"));
	assertTrue(ArrayTools.contains(a, "four"));
	}

	public void testToArrayObjectArray() {
	String[] a = new String[12];
	a[11] = "not null";
	String[] b = this.bag.toArray(a);
	assertEquals(a, b);
	assertEquals(12, a.length);
	assertTrue(ArrayTools.contains(a, null));
	assertTrue(ArrayTools.contains(a, "one"));
	assertTrue(ArrayTools.contains(a, "two"));
	assertTrue(ArrayTools.contains(a, "three"));
	assertTrue(ArrayTools.contains(a, "four"));
	assertTrue(a[11] == null);
	}

	public void testToString() {
	String s = this.bag.toString();
	assertTrue(s.startsWith("["));
	assertTrue(s.endsWith("]"));
	int commaCount = 0;
	for (int i = 0; i < s.length(); i++) {
	if (s.charAt(i) == ',') {
	commaCount++;
	}
	}
	assertEquals(10, commaCount);
	assertTrue(s.indexOf("one") != -1);
	assertTrue(s.indexOf("two") != -1);
	assertTrue(s.indexOf("three") != -1);
	assertTrue(s.indexOf("four") != -1);
	assertTrue(s.indexOf("null") != -1);
	}

	}