1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
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23 
24 /*
25  * @test
26  * @bug 4261170
27  * @summary Tests for Random.nextBytes
28  * @author Martin Buchholz
29  */
30 
31 package test.java.util.Random;
32 
33 import java.util.Arrays;
34 import java.util.Random;
35 
36 public class NextBytes {
realMain(String[] args)37     private static void realMain(String[] args) throws Throwable {
38         byte[] expected = new byte[]
39             {27, -105, -24, 83, -77, -29, 119, -74, -106, 68, 54};
40         Random r = new java.util.Random(2398579034L);
41         for (int i = 0; i <= expected.length; i++) {
42             r.setSeed(2398579034L);
43             byte[] actual = new byte[i];
44             r.nextBytes(actual);
45             //System.out.println(Arrays.toString(actual));
46             check(Arrays.equals(actual, Arrays.copyOf(expected,i)));
47         }
48     }
49 
50     //--------------------- Infrastructure ---------------------------
51     static volatile int passed = 0, failed = 0;
pass()52     static void pass() {passed++;}
fail()53     static void fail() {failed++; Thread.dumpStack();}
fail(String msg)54     static void fail(String msg) {System.out.println(msg); fail();}
unexpected(Throwable t)55     static void unexpected(Throwable t) {failed++; t.printStackTrace();}
check(boolean cond)56     static void check(boolean cond) {if (cond) pass(); else fail();}
equal(Object x, Object y)57     static void equal(Object x, Object y) {
58         if (x == null ? y == null : x.equals(y)) pass();
59         else fail(x + " not equal to " + y);}
main(String[] args)60     public static void main(String[] args) throws Throwable {
61         try {realMain(args);} catch (Throwable t) {unexpected(t);}
62         System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
63         if (failed > 0) throw new AssertionError("Some tests failed");}
64 }
65