--- jsr166/src/test/tck/Collection8Test.java	2016/11/03 15:31:25	1.8
+++ jsr166/src/test/tck/Collection8Test.java	2016/11/05 05:09:57	1.11
@@ -49,6 +49,13 @@ public class Collection8Test extends JSR
                                       impl);
     }
 
+    Object bomb() {
+        return new Object() {
+                public boolean equals(Object x) { throw new AssertionError(); }
+                public int hashCode() { throw new AssertionError(); }
+            };
+    }
+
     /** Checks properties of empty collections. */
     public void testEmptyMeansEmpty() {
         Collection c = impl.emptyCollection();
@@ -81,18 +88,25 @@ public class Collection8Test extends JSR
         c.iterator().forEachRemaining(alwaysThrows);
         c.spliterator().forEachRemaining(alwaysThrows);
         assertFalse(c.spliterator().tryAdvance(alwaysThrows));
-        if (Queue.class.isAssignableFrom(impl.klazz())) {
+        if (c.spliterator().hasCharacteristics(Spliterator.SIZED))
+            assertEquals(0, c.spliterator().estimateSize());
+        assertFalse(c.contains(bomb()));
+        assertFalse(c.remove(bomb()));
+        if (c instanceof Queue) {
             Queue q = (Queue) c;
             assertNull(q.peek());
             assertNull(q.poll());
         }
-        if (Deque.class.isAssignableFrom(impl.klazz())) {
+        if (c instanceof Deque) {
             Deque d = (Deque) c;
             assertNull(d.peekFirst());
             assertNull(d.peekLast());
             assertNull(d.pollFirst());
             assertNull(d.pollLast());
             assertIteratorExhausted(d.descendingIterator());
+            d.descendingIterator().forEachRemaining(alwaysThrows);
+            assertFalse(d.removeFirstOccurrence(bomb()));
+            assertFalse(d.removeLastOccurrence(bomb()));
         }
     }