Move TestRng to our JUnit helper package
Other test suites may find this useful, especially when trying to defeat the pack file compression with random data files. Change-Id: Ic00a4ac626af7a1c94d18ee99305e295b267b1a3 Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
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@ -1,5 +1,5 @@
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/*
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* Copyright (C) 2008, Google Inc.
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* Copyright (C) 2008-2010, Google Inc.
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* and other copyright owners as documented in the project's IP log.
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*
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* This program and the accompanying materials are made available
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@ -41,18 +41,31 @@
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.eclipse.jgit.util;
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package org.eclipse.jgit.junit;
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/** Toy RNG to ensure we get predictable numbers during unit tests. */
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public class TestRng {
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private int next;
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/**
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* Create a new random number generator, seeded by a string.
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*
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* @param seed
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* seed to bootstrap, usually this is the test method name.
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*/
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public TestRng(final String seed) {
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next = 0;
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for (int i = 0; i < seed.length(); i++)
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next = next * 11 + seed.charAt(i);
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}
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/**
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* Get the next {@code cnt} bytes of random data.
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*
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* @param cnt
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* number of random bytes to produce.
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* @return array of {@code cnt} randomly generated bytes.
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*/
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public byte[] nextBytes(final int cnt) {
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final byte[] r = new byte[cnt];
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for (int i = 0; i < cnt; i++)
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@ -60,6 +73,9 @@ public byte[] nextBytes(final int cnt) {
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return r;
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}
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/**
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* @return the next random integer.
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*/
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public int nextInt() {
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next = next * 1103515245 + 12345;
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return next;
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@ -48,6 +48,8 @@
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import java.io.IOException;
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import java.util.Arrays;
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import org.eclipse.jgit.junit.TestRng;
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import junit.framework.TestCase;
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public class TemporaryBufferTest extends TestCase {
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