--- jsr166/src/test/tck/ConcurrentSkipListSetTest.java	2016/10/16 20:44:18	1.45
+++ jsr166/src/test/tck/ConcurrentSkipListSetTest.java	2018/01/07 22:59:18	1.49
@@ -37,9 +37,8 @@ public class ConcurrentSkipListSetTest e
      * Returns a new set of given size containing consecutive
      * Integers 0 ... n - 1.
      */
-    private ConcurrentSkipListSet<Integer> populatedSet(int n) {
-        ConcurrentSkipListSet<Integer> q =
-            new ConcurrentSkipListSet<Integer>();
+    private static ConcurrentSkipListSet<Integer> populatedSet(int n) {
+        ConcurrentSkipListSet<Integer> q = new ConcurrentSkipListSet<>();
         assertTrue(q.isEmpty());
         for (int i = n - 1; i >= 0; i -= 2)
             assertTrue(q.add(new Integer(i)));
@@ -53,7 +52,7 @@ public class ConcurrentSkipListSetTest e
     /**
      * Returns a new set of first 5 ints.
      */
-    private ConcurrentSkipListSet set5() {
+    private static ConcurrentSkipListSet set5() {
         ConcurrentSkipListSet q = new ConcurrentSkipListSet();
         assertTrue(q.isEmpty());
         q.add(one);
@@ -202,7 +201,7 @@ public class ConcurrentSkipListSetTest e
         } catch (ClassCastException success) {
             assertTrue(q.size() < 2);
             for (int i = 0, size = q.size(); i < size; i++)
-                assertTrue(q.pollFirst().getClass() == Object.class);
+                assertSame(Object.class, q.pollFirst().getClass());
             assertNull(q.pollFirst());
             assertTrue(q.isEmpty());
             assertEquals(0, q.size());
@@ -526,7 +525,25 @@ public class ConcurrentSkipListSetTest e
     }
 
     /**
-     * A deserialized serialized set has same elements
+     * A cloned set equals original
+     */
+    public void testClone() {
+        ConcurrentSkipListSet x = populatedSet(SIZE);
+        ConcurrentSkipListSet y = x.clone();
+
+        assertNotSame(x, y);
+        assertEquals(x.size(), y.size());
+        assertEquals(x, y);
+        assertEquals(y, x);
+        while (!x.isEmpty()) {
+            assertFalse(y.isEmpty());
+            assertEquals(x.pollFirst(), y.pollFirst());
+        }
+        assertTrue(y.isEmpty());
+    }
+
+    /**
+     * A deserialized/reserialized set equals original
      */
     public void testSerialization() throws Exception {
         NavigableSet x = populatedSet(SIZE);