[ViewVC] Diff of: jsr166/jsr166/src/test/tck/ThreadLocalRandomTest.java

Comparing jsr166/src/test/tck/ThreadLocalRandomTest.java (file contents):
Revision 1.25 by jsr166, Tue Sep 19 20:10:49 2017 UTC vs.
Revision 1.27 by jsr166, Fri Oct 13 02:34:59 2017 UTC

+        fail("all threads generate the same pseudo-random sequence");
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+    /**
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+     * Repeated calls to nextBytes produce at least values of different signs for every byte
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+     */
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+    public void testNextBytes() {
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+        ThreadLocalRandom rnd = ThreadLocalRandom.current();
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+        int n = rnd.nextInt(1, 20);
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+        byte[] bytes = new byte[n];
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+        outer:
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+        for (int i = 0; i < n; i++) {
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+            for (int tries = NCALLS; tries-->0; ) {
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+                byte before = bytes[i];
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+                rnd.nextBytes(bytes);
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+                byte after = bytes[i];
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+                if (after * before < 0)
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+                    continue outer;
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+            }
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+            fail("not enough variation in random bytes");
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+        }
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+    }
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+    /**
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+     * Filling an empty array with random bytes succeeds without effect.
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+     */
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+    public void testNextBytes_emptyArray() {
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+        ThreadLocalRandom.current().nextBytes(new byte[0]);
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+    }
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+    public void testNextBytes_nullArray() {
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+        try {
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+            ThreadLocalRandom.current().nextBytes(null);
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+            shouldThrow();
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+        } catch (NullPointerException success) {}
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+    }
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