--- jsr166/src/test/tck/CountedCompleterTest.java	2015/10/18 19:22:36	1.25
+++ jsr166/src/test/tck/CountedCompleterTest.java	2016/10/15 18:51:12	1.30
@@ -13,6 +13,7 @@ import java.util.concurrent.CountedCompl
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.ForkJoinPool;
 import java.util.concurrent.ForkJoinTask;
+import java.util.concurrent.ThreadLocalRandom;
 import java.util.concurrent.TimeoutException;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicReference;
@@ -356,6 +357,8 @@ public class CountedCompleterTest extend
         assertEquals(1, a.getPendingCount());
         a.addToPendingCount(27);
         assertEquals(28, a.getPendingCount());
+        a.addToPendingCount(-28);
+        assertEquals(0, a.getPendingCount());
     }
 
     /**
@@ -497,7 +500,7 @@ public class CountedCompleterTest extend
     }
 
     /**
-     * quietlyCompleteRoot completes root task
+     * quietlyCompleteRoot completes root task and only root task
      */
     public void testQuietlyCompleteRoot() {
         NoopCC a = new NoopCC();