--- jsr166/src/test/tck/Collection8Test.java	2018/03/26 21:06:51	1.49
+++ jsr166/src/test/tck/Collection8Test.java	2018/04/05 03:36:54	1.51
@@ -8,6 +8,7 @@
 import static java.util.concurrent.TimeUnit.HOURS;
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 
+import java.util.ArrayDeque;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -906,6 +907,31 @@ public class Collection8Test extends JSR
         }
     }
 
+    public void testCollectionCopies() throws Exception {
+        ThreadLocalRandom rnd = ThreadLocalRandom.current();
+        Collection c = impl.emptyCollection();
+        for (int n = rnd.nextInt(4); n--> 0; )
+            c.add(impl.makeElement(rnd.nextInt()));
+        assertEquals(c, c);
+        if (c instanceof List)
+            assertCollectionsEquals(c, new ArrayList(c));
+        else if (c instanceof Set)
+            assertCollectionsEquals(c, new HashSet(c));
+        else if (c instanceof Deque)
+            assertCollectionsEquivalent(c, new ArrayDeque(c));
+
+        Collection clone = cloneableClone(c);
+        if (clone != null) {
+            assertSame(c.getClass(), clone.getClass());
+            assertCollectionsEquivalent(c, clone);
+        }
+        try {
+            Collection serialClone = serialClonePossiblyFailing(c);
+            assertSame(c.getClass(), serialClone.getClass());
+            assertCollectionsEquivalent(c, serialClone);
+        } catch (java.io.NotSerializableException acceptable) {}
+    }
+
 //     public void testCollection8DebugFail() {
 //         fail(impl.klazz().getSimpleName());
 //     }