RFR: jsr166 jdk10 integration wave 4

[Martin Buchholz]

On Thu, Oct 12, 2017 at 5:32 PM, Paul Sandoz <paul.sandoz at oracle.com> wrote:

>
> SplittableRandomTest.java
> —
>
>  592         int n = sr.nextInt(20);
>
> nextInt(1, 20) ? so you get a byte array of 1 or more in length.
>

Yes, I see now there is no testing at all when n == 0.  Empty array and
null array are both worth testing, so:

 Index: SplittableRandomTest.java
===================================================================
RCS file:
/export/home/jsr166/jsr166/jsr166/src/test/tck/SplittableRandomTest.java,v
retrieving revision 1.22
diff -u -r1.22 SplittableRandomTest.java
--- SplittableRandomTest.java 3 Oct 2017 22:27:04 -0000 1.22
+++ SplittableRandomTest.java 13 Oct 2017 02:31:20 -0000
@@ -562,7 +562,7 @@
      */
     public void testNextBytes() {
         SplittableRandom sr = new SplittableRandom();
-        int n = sr.nextInt(20);
+        int n = sr.nextInt(1, 20);
         byte[] bytes = new byte[n];
         outer:
         for (int i = 0; i < n; i++) {
@@ -577,4 +577,18 @@
         }
     }

+    /**
+     * Filling an empty array with random bytes succeeds without effect.
+     */
+    public void testNextBytes_emptyArray() {
+        new SplittableRandom().nextBytes(new byte[0]);
+    }
+
+    public void testNextBytes_nullArray() {
+        try {
+            new SplittableRandom().nextBytes(null);
+            shouldThrow();
+        } catch (NullPointerException success) {}
+    }
+
 }