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test/jdk/java/math/BigInteger/ModPow.java
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@@ -1,7 +1,7 @@
/*
- * Copyright (c) 1998, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
@@ -20,22 +20,24 @@
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/* @test
- * @bug 4181191
+ * @bug 4181191 8215759
* @summary test BigInteger modPow method
*/
import java.math.BigInteger;
import java.util.Random;
public class ModPow {
public static void main(String[] args) {
Random rnd = new Random(1234);
for (int i=0; i<2000; i++) {
- BigInteger m = new BigInteger(800, rnd);
+ // Clamp random modulus to a positive value or modPow() will
+ // throw an ArithmeticException.
+ BigInteger m = new BigInteger(800, rnd).max(BigInteger.ONE);
BigInteger base = new BigInteger(16, rnd);
if (rnd.nextInt() % 1 == 0)
base = base.negate();
BigInteger exp = new BigInteger(8, rnd);
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