--- jsr166/src/test/tck/AtomicBoolean9Test.java	2016/06/17 19:00:48	1.1
+++ jsr166/src/test/tck/AtomicBoolean9Test.java	2016/10/11 20:38:07	1.2
@@ -135,6 +135,19 @@ public class AtomicBoolean9Test extends
     }
 
     /**
+     * repeated weakCompareAndSetPlain succeeds in changing value when equal
+     * to expected
+     */
+    public void testWeakCompareAndSetPlain() {
+        AtomicBoolean ai = new AtomicBoolean(true);
+        do {} while (!ai.weakCompareAndSetPlain(true, false));
+        do {} while (!ai.weakCompareAndSetPlain(false, false));
+        assertFalse(ai.get());
+        do {} while (!ai.weakCompareAndSetPlain(false, true));
+        assertTrue(ai.get());
+    }
+
+    /**
      * repeated weakCompareAndSetVolatile succeeds in changing value when equal
      * to expected
      */