--- jsr166/src/test/tck/AtomicLongArray9Test.java	2016/08/24 22:22:39	1.2
+++ jsr166/src/test/tck/AtomicLongArray9Test.java	2019/02/22 19:27:47	1.4
@@ -24,7 +24,8 @@ public class AtomicLongArray9Test extend
         AtomicLongArray aa = new AtomicLongArray(SIZE);
         for (int index : new int[] { -1, SIZE }) {
             final int j = index;
-            final Runnable[] tasks = {
+              assertThrows(
+                IndexOutOfBoundsException.class,
                 () -> aa.getPlain(j),
                 () -> aa.getOpaque(j),
                 () -> aa.getAcquire(j),
@@ -34,12 +35,10 @@ public class AtomicLongArray9Test extend
                 () -> aa.compareAndExchange(j, 1, 2),
                 () -> aa.compareAndExchangeAcquire(j, 1, 2),
                 () -> aa.compareAndExchangeRelease(j, 1, 2),
+                () -> aa.weakCompareAndSetPlain(j, 1, 2),
                 () -> aa.weakCompareAndSetVolatile(j, 1, 2),
                 () -> aa.weakCompareAndSetAcquire(j, 1, 2),
-                () -> aa.weakCompareAndSetRelease(j, 1, 2),
-            };
-
-            assertThrows(IndexOutOfBoundsException.class, tasks);
+                () -> aa.weakCompareAndSetRelease(j, 1, 2));
         }
     }
 
@@ -186,6 +185,22 @@ public class AtomicLongArray9Test extend
             assertEquals(7, aa.get(i));
         }
     }
+
+    /**
+     * repeated weakCompareAndSetPlain succeeds in changing value when equal
+     * to expected
+     */
+    public void testWeakCompareAndSetPlain() {
+        AtomicLongArray aa = new AtomicLongArray(SIZE);
+        for (int i = 0; i < SIZE; i++) {
+            aa.set(i, 1);
+            do {} while (!aa.weakCompareAndSetPlain(i, 1, 2));
+            do {} while (!aa.weakCompareAndSetPlain(i, 2, -4));
+            assertEquals(-4, aa.get(i));
+            do {} while (!aa.weakCompareAndSetPlain(i, -4, 7));
+            assertEquals(7, aa.get(i));
+        }
+    }
 
     /**
      * repeated weakCompareAndSetVolatile succeeds in changing value when equal