--- jsr166/src/test/tck/ConcurrentSkipListSetTest.java	2011/11/26 05:42:14	1.25
+++ jsr166/src/test/tck/ConcurrentSkipListSetTest.java	2013/05/30 03:28:55	1.30
@@ -32,7 +32,7 @@ public class ConcurrentSkipListSetTest e
     }
 
     /**
-     * Create a set of given size containing consecutive
+     * Returns a new set of given size containing consecutive
      * Integers 0 ... n.
      */
     private ConcurrentSkipListSet<Integer> populatedSet(int n) {
@@ -49,7 +49,7 @@ public class ConcurrentSkipListSetTest e
     }
 
     /**
-     * Create set of first 5 ints
+     * Returns a new set of first 5 ints.
      */
     private ConcurrentSkipListSet set5() {
         ConcurrentSkipListSet q = new ConcurrentSkipListSet();
@@ -461,8 +461,7 @@ public class ConcurrentSkipListSetTest e
     public void testToArray2() {
         ConcurrentSkipListSet<Integer> q = populatedSet(SIZE);
         Integer[] ints = new Integer[SIZE];
-        Integer[] array = q.toArray(ints);
-        assertSame(ints, array);
+        assertSame(ints, q.toArray(ints));
         for (int i = 0; i < ints.length; i++)
             assertSame(ints[i], q.pollFirst());
     }
@@ -532,7 +531,7 @@ public class ConcurrentSkipListSetTest e
         NavigableSet x = populatedSet(SIZE);
         NavigableSet y = serialClone(x);
 
-        assertTrue(x != y);
+        assertNotSame(x, y);
         assertEquals(x.size(), y.size());
         assertEquals(x, y);
         assertEquals(y, x);
@@ -686,6 +685,17 @@ public class ConcurrentSkipListSetTest e
                    0, setSize - 1, true, bs);
     }
 
+    /**
+     * addAll is idempotent
+     */
+    public void testAddAll_idempotent() throws Exception {
+        Set x = populatedSet(SIZE);
+        Set y = new ConcurrentSkipListSet(x);
+        y.addAll(x);
+        assertEquals(x, y);
+        assertEquals(y, x);
+    }
+
     static NavigableSet<Integer> newSet(Class cl) throws Exception {
         NavigableSet<Integer> result = (NavigableSet<Integer>) cl.newInstance();
         assertEquals(0, result.size());