concurrent/src/test/java/ConcurrentHashMapTest.java - platform/external/apache-harmony - Git at Google

 /*
  * Written by Doug Lea with assistance from members of JCP JSR-166
  * Expert Group and released to the public domain, as explained at
  * http://creativecommons.org/licenses/publicdomain
  * Other contributors include Andrew Wright, Jeffrey Hayes,
  * Pat Fisher, Mike Judd.
  */

 import junit.framework.*;
 import java.util.*;
 import java.util.concurrent.*;
 import java.util.Enumeration;
 import java.io.*;

 public class ConcurrentHashMapTest extends JSR166TestCase{
     public static void main(String[] args) {
 	junit.textui.TestRunner.run (suite());
     }
     public static Test suite() {
 	return new TestSuite(ConcurrentHashMapTest.class);
     }

     /**
      * Create a map from Integers 1-5 to Strings "A"-"E".
      */
     private static ConcurrentHashMap map5() {
 	ConcurrentHashMap map = new ConcurrentHashMap(5);
         assertTrue(map.isEmpty());
 	map.put(one, "A");
 	map.put(two, "B");
 	map.put(three, "C");
 	map.put(four, "D");
 	map.put(five, "E");
         assertFalse(map.isEmpty());
         assertEquals(5, map.size());
 	return map;
     }

     /**
      *  clear removes all pairs
      */
     public void testClear() {
         ConcurrentHashMap map = map5();
 	map.clear();
 	assertEquals(map.size(), 0);
     }

     /**
      *  Maps with same contents are equal
      */
     public void testEquals() {
         ConcurrentHashMap map1 = map5();
         ConcurrentHashMap map2 = map5();
         assertEquals(map1, map2);
         assertEquals(map2, map1);
 	map1.clear();
         assertFalse(map1.equals(map2));
         assertFalse(map2.equals(map1));
     }

     /**
      *  contains returns true for contained value
      */
     public void testContains() {
         ConcurrentHashMap map = map5();
 	assertTrue(map.contains("A"));
         assertFalse(map.contains("Z"));
     }

     /**
      *  containsKey returns true for contained key
      */
     public void testContainsKey() {
         ConcurrentHashMap map = map5();
 	assertTrue(map.containsKey(one));
         assertFalse(map.containsKey(zero));
     }

     /**
      *  containsValue returns true for held values
      */
     public void testContainsValue() {
         ConcurrentHashMap map = map5();
 	assertTrue(map.containsValue("A"));
         assertFalse(map.containsValue("Z"));
     }

     /**
      *   enumeration returns an enumeration containing the correct
      *   elements
      */
     public void testEnumeration() {
         ConcurrentHashMap map = map5();
 	Enumeration e = map.elements();
 	int count = 0;
 	while(e.hasMoreElements()){
 	    count++;
 	    e.nextElement();
 	}
 	assertEquals(5, count);
     }

     /**
      *  get returns the correct element at the given key,
      *  or null if not present
      */
     public void testGet() {
         ConcurrentHashMap map = map5();
 	assertEquals("A", (String)map.get(one));
         ConcurrentHashMap empty = new ConcurrentHashMap();
         assertNull(map.get("anything"));
     }

     /**
      *  isEmpty is true of empty map and false for non-empty
      */
     public void testIsEmpty() {
         ConcurrentHashMap empty = new ConcurrentHashMap();
         ConcurrentHashMap map = map5();
 	assertTrue(empty.isEmpty());
         assertFalse(map.isEmpty());
     }

     /**
      *   keys returns an enumeration containing all the keys from the map
      */
     public void testKeys() {
         ConcurrentHashMap map = map5();
 	Enumeration e = map.keys();
 	int count = 0;
 	while(e.hasMoreElements()){
 	    count++;
 	    e.nextElement();
 	}
 	assertEquals(5, count);
     }

     /**
      *   keySet returns a Set containing all the keys
      */
     public void testKeySet() {
         ConcurrentHashMap map = map5();
 	Set s = map.keySet();
 	assertEquals(5, s.size());
 	assertTrue(s.contains(one));
 	assertTrue(s.contains(two));
 	assertTrue(s.contains(three));
 	assertTrue(s.contains(four));
 	assertTrue(s.contains(five));
     }

     /**
      *  keySet.toArray returns contains all keys
      */
     public void testKeySetToArray() {
         ConcurrentHashMap map = map5();
 	Set s = map.keySet();
         Object[] ar = s.toArray();
         assertTrue(s.containsAll(Arrays.asList(ar)));
 	assertEquals(5, ar.length);
         ar[0] = m10;
         assertFalse(s.containsAll(Arrays.asList(ar)));
     }

     /**
      *  Values.toArray contains all values
      */
     public void testValuesToArray() {
         ConcurrentHashMap map = map5();
 	Collection v = map.values();
         Object[] ar = v.toArray();
         ArrayList s = new ArrayList(Arrays.asList(ar));
 	assertEquals(5, ar.length);
 	assertTrue(s.contains("A"));
 	assertTrue(s.contains("B"));
 	assertTrue(s.contains("C"));
 	assertTrue(s.contains("D"));
 	assertTrue(s.contains("E"));
     }

     /**
      *  entrySet.toArray contains all entries
      */
     public void testEntrySetToArray() {
         ConcurrentHashMap map = map5();
 	Set s = map.entrySet();
         Object[] ar = s.toArray();
         assertEquals(5, ar.length);
         for (int i = 0; i < 5; ++i) {
             assertTrue(map.containsKey(((Map.Entry)(ar[i])).getKey()));
             assertTrue(map.containsValue(((Map.Entry)(ar[i])).getValue()));
         }
     }

     /**
      * values collection contains all values
      */
     public void testValues() {
         ConcurrentHashMap map = map5();
 	Collection s = map.values();
 	assertEquals(5, s.size());
 	assertTrue(s.contains("A"));
 	assertTrue(s.contains("B"));
 	assertTrue(s.contains("C"));
 	assertTrue(s.contains("D"));
 	assertTrue(s.contains("E"));
     }

     /**
      * entrySet contains all pairs
      */
     public void testEntrySet() {
         ConcurrentHashMap map = map5();
 	Set s = map.entrySet();
 	assertEquals(5, s.size());
         Iterator it = s.iterator();
         while (it.hasNext()) {
             Map.Entry e = (Map.Entry) it.next();
             assertTrue(
                        (e.getKey().equals(one) && e.getValue().equals("A")) ||
                        (e.getKey().equals(two) && e.getValue().equals("B")) ||
                        (e.getKey().equals(three) && e.getValue().equals("C")) ||
                        (e.getKey().equals(four) && e.getValue().equals("D")) ||
                        (e.getKey().equals(five) && e.getValue().equals("E")));
         }
     }

     /**
      *   putAll  adds all key-value pairs from the given map
      */
     public void testPutAll() {
         ConcurrentHashMap empty = new ConcurrentHashMap();
         ConcurrentHashMap map = map5();
 	empty.putAll(map);
 	assertEquals(5, empty.size());
 	assertTrue(empty.containsKey(one));
 	assertTrue(empty.containsKey(two));
 	assertTrue(empty.containsKey(three));
 	assertTrue(empty.containsKey(four));
 	assertTrue(empty.containsKey(five));
     }

     /**
      *   putIfAbsent works when the given key is not present
      */
     public void testPutIfAbsent() {
         ConcurrentHashMap map = map5();
 	map.putIfAbsent(six, "Z");
         assertTrue(map.containsKey(six));
     }

     /**
      *   putIfAbsent does not add the pair if the key is already present
      */
     public void testPutIfAbsent2() {
         ConcurrentHashMap map = map5();
         assertEquals("A", map.putIfAbsent(one, "Z"));
     }

     /**
      *   replace fails when the given key is not present
      */
     public void testReplace() {
         ConcurrentHashMap map = map5();
 	assertNull(map.replace(six, "Z"));
         assertFalse(map.containsKey(six));
     }

     /**
      *   replace succeeds if the key is already present
      */
     public void testReplace2() {
         ConcurrentHashMap map = map5();
         assertNotNull(map.replace(one, "Z"));
         assertEquals("Z", map.get(one));
     }


     /**
      * replace value fails when the given key not mapped to expected value
      */
     public void testReplaceValue() {
         ConcurrentHashMap map = map5();
         assertEquals("A", map.get(one));
 	assertFalse(map.replace(one, "Z", "Z"));
         assertEquals("A", map.get(one));
     }

     /**
      * replace value succeeds when the given key mapped to expected value
      */
     public void testReplaceValue2() {
         ConcurrentHashMap map = map5();
         assertEquals("A", map.get(one));
 	assertTrue(map.replace(one, "A", "Z"));
         assertEquals("Z", map.get(one));
     }


     /**
      *   remove removes the correct key-value pair from the map
      */
     public void testRemove() {
         ConcurrentHashMap map = map5();
 	map.remove(five);
 	assertEquals(4, map.size());
 	assertFalse(map.containsKey(five));
     }

     /**
      * remove(key,value) removes only if pair present
      */
     public void testRemove2() {
         ConcurrentHashMap map = map5();
 	map.remove(five, "E");
 	assertEquals(4, map.size());
 	assertFalse(map.containsKey(five));
 	map.remove(four, "A");
 	assertEquals(4, map.size());
 	assertTrue(map.containsKey(four));

     }

     /**
      *   size returns the correct values
      */
     public void testSize() {
         ConcurrentHashMap map = map5();
         ConcurrentHashMap empty = new ConcurrentHashMap();
 	assertEquals(0, empty.size());
 	assertEquals(5, map.size());
     }

     /**
      * toString contains toString of elements
      */
     public void testToString() {
         ConcurrentHashMap map = map5();
         String s = map.toString();
         for (int i = 1; i <= 5; ++i) {
             assertTrue(s.indexOf(String.valueOf(i)) >= 0);
         }
     }

     // Exception tests

     /**
      * Cannot create with negative capacity
      */
     public void testConstructor1() {
         try {
             new ConcurrentHashMap(-1,0,1);
             shouldThrow();
         } catch(IllegalArgumentException e){}
     }

     /**
      * Cannot create with negative concurrency level
      */
     public void testConstructor2() {
         try {
             new ConcurrentHashMap(1,0,-1);
             shouldThrow();
         } catch(IllegalArgumentException e){}
     }

     /**
      * Cannot create with only negative capacity
      */
     public void testConstructor3() {
         try {
             new ConcurrentHashMap(-1);
             shouldThrow();
         } catch(IllegalArgumentException e){}
     }

     /**
      * get(null) throws NPE
      */
     public void testGet_NullPointerException() {
         try {
             ConcurrentHashMap c = new ConcurrentHashMap(5);
             c.get(null);
             shouldThrow();
         } catch(NullPointerException e){}
     }

     /**
      * containsKey(null) throws NPE
      */
     public void testContainsKey_NullPointerException() {
         try {
             ConcurrentHashMap c = new ConcurrentHashMap(5);
             c.containsKey(null);
             shouldThrow();
         } catch(NullPointerException e){}
     }

     /**
      * containsValue(null) throws NPE
      */
     public void testContainsValue_NullPointerException() {
         try {
             ConcurrentHashMap c = new ConcurrentHashMap(5);
             c.containsValue(null);
             shouldThrow();
         } catch(NullPointerException e){}
     }

     /**
      * contains(null) throws NPE
      */
     public void testContains_NullPointerException() {
         try {
             ConcurrentHashMap c = new ConcurrentHashMap(5);
             c.contains(null);
             shouldThrow();
         } catch(NullPointerException e){}
     }

     /**
      * put(null,x) throws NPE
      */
     public void testPut1_NullPointerException() {
         try {
             ConcurrentHashMap c = new ConcurrentHashMap(5);
             c.put(null, "whatever");
             shouldThrow();
         } catch(NullPointerException e){}
     }

     /**
      * put(x, null) throws NPE
      */
     public void testPut2_NullPointerException() {
         try {
             ConcurrentHashMap c = new ConcurrentHashMap(5);
             c.put("whatever", null);
             shouldThrow();
         } catch(NullPointerException e){}
     }

     /**
      * putIfAbsent(null, x) throws NPE
      */
     public void testPutIfAbsent1_NullPointerException() {
         try {
             ConcurrentHashMap c = new ConcurrentHashMap(5);
             c.putIfAbsent(null, "whatever");
             shouldThrow();
         } catch(NullPointerException e){}
     }

     /**
      * replace(null, x) throws NPE
      */
     public void testReplace_NullPointerException() {
         try {
             ConcurrentHashMap c = new ConcurrentHashMap(5);
             c.replace(null, "whatever");
             shouldThrow();
         } catch(NullPointerException e){}
     }

     /**
      * replace(null, x, y) throws NPE
      */
     public void testReplaceValue_NullPointerException() {
         try {
             ConcurrentHashMap c = new ConcurrentHashMap(5);
             c.replace(null, one, "whatever");
             shouldThrow();
         } catch(NullPointerException e){}
     }

     /**
      * putIfAbsent(x, null) throws NPE
      */
     public void testPutIfAbsent2_NullPointerException() {
         try {
             ConcurrentHashMap c = new ConcurrentHashMap(5);
             c.putIfAbsent("whatever", null);
             shouldThrow();
         } catch(NullPointerException e){}
     }


     /**
      * replace(x, null) throws NPE
      */
     public void testReplace2_NullPointerException() {
         try {
             ConcurrentHashMap c = new ConcurrentHashMap(5);
             c.replace("whatever", null);
             shouldThrow();
         } catch(NullPointerException e){}
     }

     /**
      * replace(x, null, y) throws NPE
      */
     public void testReplaceValue2_NullPointerException() {
         try {
             ConcurrentHashMap c = new ConcurrentHashMap(5);
             c.replace("whatever", null, "A");
             shouldThrow();
         } catch(NullPointerException e){}
     }

     /**
      * replace(x, y, null) throws NPE
      */
     public void testReplaceValue3_NullPointerException() {
         try {
             ConcurrentHashMap c = new ConcurrentHashMap(5);
             c.replace("whatever", one, null);
             shouldThrow();
         } catch(NullPointerException e){}
     }


     /**
      * remove(null) throws NPE
      */
     public void testRemove1_NullPointerException() {
         try {
             ConcurrentHashMap c = new ConcurrentHashMap(5);
             c.put("sadsdf", "asdads");
             c.remove(null);
             shouldThrow();
         } catch(NullPointerException e){}
     }

     /**
      * remove(null, x) throws NPE
      */
     public void testRemove2_NullPointerException() {
         try {
             ConcurrentHashMap c = new ConcurrentHashMap(5);
             c.put("sadsdf", "asdads");
             c.remove(null, "whatever");
             shouldThrow();
         } catch(NullPointerException e){}
     }

     /**
      * remove(x, null) returns false
      */
     public void testRemove3() {
         try {
             ConcurrentHashMap c = new ConcurrentHashMap(5);
             c.put("sadsdf", "asdads");
             assertFalse(c.remove("sadsdf", null));
         } catch(NullPointerException e){
             fail();
         }
     }

     /**
      * A deserialized map equals original
      */
     public void testSerialization() {
         ConcurrentHashMap q = map5();

         try {
             ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
             ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
             out.writeObject(q);
             out.close();

             ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
             ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
             ConcurrentHashMap r = (ConcurrentHashMap)in.readObject();
             assertEquals(q.size(), r.size());
             assertTrue(q.equals(r));
             assertTrue(r.equals(q));
         } catch(Exception e){
             e.printStackTrace();
             unexpectedException();
         }
     }


     /**
      * SetValue of an EntrySet entry sets value in the map.
      */
     public void testSetValueWriteThrough() {
         // Adapted from a bug report by Eric Zoerner
         ConcurrentHashMap map = new ConcurrentHashMap(2, 5.0f, 1);
         assertTrue(map.isEmpty());
         for (int i = 0; i < 20; i++)
             map.put(new Integer(i), new Integer(i));
         assertFalse(map.isEmpty());
         Map.Entry entry1 = (Map.Entry)map.entrySet().iterator().next();

         // assert that entry1 is not 16
         assertTrue("entry is 16, test not valid",
                    !entry1.getKey().equals(new Integer(16)));

         // remove 16 (a different key) from map
         // which just happens to cause entry1 to be cloned in map
         map.remove(new Integer(16));
         entry1.setValue("XYZ");
         assertTrue(map.containsValue("XYZ")); // fails
     }

 }
	/*
	* Written by Doug Lea with assistance from members of JCP JSR-166
	* Expert Group and released to the public domain, as explained at
	* http://creativecommons.org/licenses/publicdomain
	* Other contributors include Andrew Wright, Jeffrey Hayes,
	* Pat Fisher, Mike Judd.
	*/

	import junit.framework.*;
	import java.util.*;
	import java.util.concurrent.*;
	import java.util.Enumeration;
	import java.io.*;

	public class ConcurrentHashMapTest extends JSR166TestCase{
	public static void main(String[] args) {
	junit.textui.TestRunner.run (suite());
	}
	public static Test suite() {
	return new TestSuite(ConcurrentHashMapTest.class);
	}

	/**
	* Create a map from Integers 1-5 to Strings "A"-"E".
	*/
	private static ConcurrentHashMap map5() {
	ConcurrentHashMap map = new ConcurrentHashMap(5);
	assertTrue(map.isEmpty());
	map.put(one, "A");
	map.put(two, "B");
	map.put(three, "C");
	map.put(four, "D");
	map.put(five, "E");
	assertFalse(map.isEmpty());
	assertEquals(5, map.size());
	return map;
	}

	/**
	* clear removes all pairs
	*/
	public void testClear() {
	ConcurrentHashMap map = map5();
	map.clear();
	assertEquals(map.size(), 0);
	}

	/**
	* Maps with same contents are equal
	*/
	public void testEquals() {
	ConcurrentHashMap map1 = map5();
	ConcurrentHashMap map2 = map5();
	assertEquals(map1, map2);
	assertEquals(map2, map1);
	map1.clear();
	assertFalse(map1.equals(map2));
	assertFalse(map2.equals(map1));
	}

	/**
	* contains returns true for contained value
	*/
	public void testContains() {
	ConcurrentHashMap map = map5();
	assertTrue(map.contains("A"));
	assertFalse(map.contains("Z"));
	}

	/**
	* containsKey returns true for contained key
	*/
	public void testContainsKey() {
	ConcurrentHashMap map = map5();
	assertTrue(map.containsKey(one));
	assertFalse(map.containsKey(zero));
	}

	/**
	* containsValue returns true for held values
	*/
	public void testContainsValue() {
	ConcurrentHashMap map = map5();
	assertTrue(map.containsValue("A"));
	assertFalse(map.containsValue("Z"));
	}

	/**
	* enumeration returns an enumeration containing the correct
	* elements
	*/
	public void testEnumeration() {
	ConcurrentHashMap map = map5();
	Enumeration e = map.elements();
	int count = 0;
	while(e.hasMoreElements()){
	count++;
	e.nextElement();
	}
	assertEquals(5, count);
	}

	/**
	* get returns the correct element at the given key,
	* or null if not present
	*/
	public void testGet() {
	ConcurrentHashMap map = map5();
	assertEquals("A", (String)map.get(one));
	ConcurrentHashMap empty = new ConcurrentHashMap();
	assertNull(map.get("anything"));
	}

	/**
	* isEmpty is true of empty map and false for non-empty
	*/
	public void testIsEmpty() {
	ConcurrentHashMap empty = new ConcurrentHashMap();
	ConcurrentHashMap map = map5();
	assertTrue(empty.isEmpty());
	assertFalse(map.isEmpty());
	}

	/**
	* keys returns an enumeration containing all the keys from the map
	*/
	public void testKeys() {
	ConcurrentHashMap map = map5();
	Enumeration e = map.keys();
	int count = 0;
	while(e.hasMoreElements()){
	count++;
	e.nextElement();
	}
	assertEquals(5, count);
	}

	/**
	* keySet returns a Set containing all the keys
	*/
	public void testKeySet() {
	ConcurrentHashMap map = map5();
	Set s = map.keySet();
	assertEquals(5, s.size());
	assertTrue(s.contains(one));
	assertTrue(s.contains(two));
	assertTrue(s.contains(three));
	assertTrue(s.contains(four));
	assertTrue(s.contains(five));
	}

	/**
	* keySet.toArray returns contains all keys
	*/
	public void testKeySetToArray() {
	ConcurrentHashMap map = map5();
	Set s = map.keySet();
	Object[] ar = s.toArray();
	assertTrue(s.containsAll(Arrays.asList(ar)));
	assertEquals(5, ar.length);
	ar[0] = m10;
	assertFalse(s.containsAll(Arrays.asList(ar)));
	}

	/**
	* Values.toArray contains all values
	*/
	public void testValuesToArray() {
	ConcurrentHashMap map = map5();
	Collection v = map.values();
	Object[] ar = v.toArray();
	ArrayList s = new ArrayList(Arrays.asList(ar));
	assertEquals(5, ar.length);
	assertTrue(s.contains("A"));
	assertTrue(s.contains("B"));
	assertTrue(s.contains("C"));
	assertTrue(s.contains("D"));
	assertTrue(s.contains("E"));
	}

	/**
	* entrySet.toArray contains all entries
	*/
	public void testEntrySetToArray() {
	ConcurrentHashMap map = map5();
	Set s = map.entrySet();
	Object[] ar = s.toArray();
	assertEquals(5, ar.length);
	for (int i = 0; i < 5; ++i) {
	assertTrue(map.containsKey(((Map.Entry)(ar[i])).getKey()));
	assertTrue(map.containsValue(((Map.Entry)(ar[i])).getValue()));
	}
	}

	/**
	* values collection contains all values
	*/
	public void testValues() {
	ConcurrentHashMap map = map5();
	Collection s = map.values();
	assertEquals(5, s.size());
	assertTrue(s.contains("A"));
	assertTrue(s.contains("B"));
	assertTrue(s.contains("C"));
	assertTrue(s.contains("D"));
	assertTrue(s.contains("E"));
	}

	/**
	* entrySet contains all pairs
	*/
	public void testEntrySet() {
	ConcurrentHashMap map = map5();
	Set s = map.entrySet();
	assertEquals(5, s.size());
	Iterator it = s.iterator();
	while (it.hasNext()) {
	Map.Entry e = (Map.Entry) it.next();
	assertTrue(
	(e.getKey().equals(one) && e.getValue().equals("A")) \|\|
	(e.getKey().equals(two) && e.getValue().equals("B")) \|\|
	(e.getKey().equals(three) && e.getValue().equals("C")) \|\|
	(e.getKey().equals(four) && e.getValue().equals("D")) \|\|
	(e.getKey().equals(five) && e.getValue().equals("E")));
	}
	}

	/**
	* putAll adds all key-value pairs from the given map
	*/
	public void testPutAll() {
	ConcurrentHashMap empty = new ConcurrentHashMap();
	ConcurrentHashMap map = map5();
	empty.putAll(map);
	assertEquals(5, empty.size());
	assertTrue(empty.containsKey(one));
	assertTrue(empty.containsKey(two));
	assertTrue(empty.containsKey(three));
	assertTrue(empty.containsKey(four));
	assertTrue(empty.containsKey(five));
	}

	/**
	* putIfAbsent works when the given key is not present
	*/
	public void testPutIfAbsent() {
	ConcurrentHashMap map = map5();
	map.putIfAbsent(six, "Z");
	assertTrue(map.containsKey(six));
	}

	/**
	* putIfAbsent does not add the pair if the key is already present
	*/
	public void testPutIfAbsent2() {
	ConcurrentHashMap map = map5();
	assertEquals("A", map.putIfAbsent(one, "Z"));
	}

	/**
	* replace fails when the given key is not present
	*/
	public void testReplace() {
	ConcurrentHashMap map = map5();
	assertNull(map.replace(six, "Z"));
	assertFalse(map.containsKey(six));
	}

	/**
	* replace succeeds if the key is already present
	*/
	public void testReplace2() {
	ConcurrentHashMap map = map5();
	assertNotNull(map.replace(one, "Z"));
	assertEquals("Z", map.get(one));
	}


	/**
	* replace value fails when the given key not mapped to expected value
	*/
	public void testReplaceValue() {
	ConcurrentHashMap map = map5();
	assertEquals("A", map.get(one));
	assertFalse(map.replace(one, "Z", "Z"));
	assertEquals("A", map.get(one));
	}

	/**
	* replace value succeeds when the given key mapped to expected value
	*/
	public void testReplaceValue2() {
	ConcurrentHashMap map = map5();
	assertEquals("A", map.get(one));
	assertTrue(map.replace(one, "A", "Z"));
	assertEquals("Z", map.get(one));
	}


	/**
	* remove removes the correct key-value pair from the map
	*/
	public void testRemove() {
	ConcurrentHashMap map = map5();
	map.remove(five);
	assertEquals(4, map.size());
	assertFalse(map.containsKey(five));
	}

	/**
	* remove(key,value) removes only if pair present
	*/
	public void testRemove2() {
	ConcurrentHashMap map = map5();
	map.remove(five, "E");
	assertEquals(4, map.size());
	assertFalse(map.containsKey(five));
	map.remove(four, "A");
	assertEquals(4, map.size());
	assertTrue(map.containsKey(four));

	}

	/**
	* size returns the correct values
	*/
	public void testSize() {
	ConcurrentHashMap map = map5();
	ConcurrentHashMap empty = new ConcurrentHashMap();
	assertEquals(0, empty.size());
	assertEquals(5, map.size());
	}

	/**
	* toString contains toString of elements
	*/
	public void testToString() {
	ConcurrentHashMap map = map5();
	String s = map.toString();
	for (int i = 1; i <= 5; ++i) {
	assertTrue(s.indexOf(String.valueOf(i)) >= 0);
	}
	}

	// Exception tests

	/**
	* Cannot create with negative capacity
	*/
	public void testConstructor1() {
	try {
	new ConcurrentHashMap(-1,0,1);
	shouldThrow();
	} catch(IllegalArgumentException e){}
	}

	/**
	* Cannot create with negative concurrency level
	*/
	public void testConstructor2() {
	try {
	new ConcurrentHashMap(1,0,-1);
	shouldThrow();
	} catch(IllegalArgumentException e){}
	}

	/**
	* Cannot create with only negative capacity
	*/
	public void testConstructor3() {
	try {
	new ConcurrentHashMap(-1);
	shouldThrow();
	} catch(IllegalArgumentException e){}
	}

	/**
	* get(null) throws NPE
	*/
	public void testGet_NullPointerException() {
	try {
	ConcurrentHashMap c = new ConcurrentHashMap(5);
	c.get(null);
	shouldThrow();
	} catch(NullPointerException e){}
	}

	/**
	* containsKey(null) throws NPE
	*/
	public void testContainsKey_NullPointerException() {
	try {
	ConcurrentHashMap c = new ConcurrentHashMap(5);
	c.containsKey(null);
	shouldThrow();
	} catch(NullPointerException e){}
	}

	/**
	* containsValue(null) throws NPE
	*/
	public void testContainsValue_NullPointerException() {
	try {
	ConcurrentHashMap c = new ConcurrentHashMap(5);
	c.containsValue(null);
	shouldThrow();
	} catch(NullPointerException e){}
	}

	/**
	* contains(null) throws NPE
	*/
	public void testContains_NullPointerException() {
	try {
	ConcurrentHashMap c = new ConcurrentHashMap(5);
	c.contains(null);
	shouldThrow();
	} catch(NullPointerException e){}
	}

	/**
	* put(null,x) throws NPE
	*/
	public void testPut1_NullPointerException() {
	try {
	ConcurrentHashMap c = new ConcurrentHashMap(5);
	c.put(null, "whatever");
	shouldThrow();
	} catch(NullPointerException e){}
	}

	/**
	* put(x, null) throws NPE
	*/
	public void testPut2_NullPointerException() {
	try {
	ConcurrentHashMap c = new ConcurrentHashMap(5);
	c.put("whatever", null);
	shouldThrow();
	} catch(NullPointerException e){}
	}

	/**
	* putIfAbsent(null, x) throws NPE
	*/
	public void testPutIfAbsent1_NullPointerException() {
	try {
	ConcurrentHashMap c = new ConcurrentHashMap(5);
	c.putIfAbsent(null, "whatever");
	shouldThrow();
	} catch(NullPointerException e){}
	}

	/**
	* replace(null, x) throws NPE
	*/
	public void testReplace_NullPointerException() {
	try {
	ConcurrentHashMap c = new ConcurrentHashMap(5);
	c.replace(null, "whatever");
	shouldThrow();
	} catch(NullPointerException e){}
	}

	/**
	* replace(null, x, y) throws NPE
	*/
	public void testReplaceValue_NullPointerException() {
	try {
	ConcurrentHashMap c = new ConcurrentHashMap(5);
	c.replace(null, one, "whatever");
	shouldThrow();
	} catch(NullPointerException e){}
	}

	/**
	* putIfAbsent(x, null) throws NPE
	*/
	public void testPutIfAbsent2_NullPointerException() {
	try {
	ConcurrentHashMap c = new ConcurrentHashMap(5);
	c.putIfAbsent("whatever", null);
	shouldThrow();
	} catch(NullPointerException e){}
	}


	/**
	* replace(x, null) throws NPE
	*/
	public void testReplace2_NullPointerException() {
	try {
	ConcurrentHashMap c = new ConcurrentHashMap(5);
	c.replace("whatever", null);
	shouldThrow();
	} catch(NullPointerException e){}
	}

	/**
	* replace(x, null, y) throws NPE
	*/
	public void testReplaceValue2_NullPointerException() {
	try {
	ConcurrentHashMap c = new ConcurrentHashMap(5);
	c.replace("whatever", null, "A");
	shouldThrow();
	} catch(NullPointerException e){}
	}

	/**
	* replace(x, y, null) throws NPE
	*/
	public void testReplaceValue3_NullPointerException() {
	try {
	ConcurrentHashMap c = new ConcurrentHashMap(5);
	c.replace("whatever", one, null);
	shouldThrow();
	} catch(NullPointerException e){}
	}


	/**
	* remove(null) throws NPE
	*/
	public void testRemove1_NullPointerException() {
	try {
	ConcurrentHashMap c = new ConcurrentHashMap(5);
	c.put("sadsdf", "asdads");
	c.remove(null);
	shouldThrow();
	} catch(NullPointerException e){}
	}

	/**
	* remove(null, x) throws NPE
	*/
	public void testRemove2_NullPointerException() {
	try {
	ConcurrentHashMap c = new ConcurrentHashMap(5);
	c.put("sadsdf", "asdads");
	c.remove(null, "whatever");
	shouldThrow();
	} catch(NullPointerException e){}
	}

	/**
	* remove(x, null) returns false
	*/
	public void testRemove3() {
	try {
	ConcurrentHashMap c = new ConcurrentHashMap(5);
	c.put("sadsdf", "asdads");
	assertFalse(c.remove("sadsdf", null));
	} catch(NullPointerException e){
	fail();
	}
	}

	/**
	* A deserialized map equals original
	*/
	public void testSerialization() {
	ConcurrentHashMap q = map5();

	try {
	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
	out.writeObject(q);
	out.close();

	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
	ConcurrentHashMap r = (ConcurrentHashMap)in.readObject();
	assertEquals(q.size(), r.size());
	assertTrue(q.equals(r));
	assertTrue(r.equals(q));
	} catch(Exception e){
	e.printStackTrace();
	unexpectedException();
	}
	}


	/**
	* SetValue of an EntrySet entry sets value in the map.
	*/
	public void testSetValueWriteThrough() {
	// Adapted from a bug report by Eric Zoerner
	ConcurrentHashMap map = new ConcurrentHashMap(2, 5.0f, 1);
	assertTrue(map.isEmpty());
	for (int i = 0; i < 20; i++)
	map.put(new Integer(i), new Integer(i));
	assertFalse(map.isEmpty());
	Map.Entry entry1 = (Map.Entry)map.entrySet().iterator().next();

	// assert that entry1 is not 16
	assertTrue("entry is 16, test not valid",
	!entry1.getKey().equals(new Integer(16)));

	// remove 16 (a different key) from map
	// which just happens to cause entry1 to be cloned in map
	map.remove(new Integer(16));
	entry1.setValue("XYZ");
	assertTrue(map.containsValue("XYZ")); // fails
	}

	}