--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/testlibrary_tests/RandomGeneratorTest.java Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,174 @@
+/*
+ * Copyright (c) 2014, 2016, 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.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @summary Verify correctnes of the random generator from Utility.java
+ * @library /test/lib
+ * @modules java.base/jdk.internal.misc
+ * java.management
+ * @run driver RandomGeneratorTest SAME_SEED
+ * @run driver RandomGeneratorTest NO_SEED
+ * @run driver RandomGeneratorTest DIFFERENT_SEED
+ */
+
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+import jdk.test.lib.process.OutputAnalyzer;
+import jdk.test.lib.process.ProcessTools;
+import jdk.test.lib.Utils;
+
+/**
+ * The test verifies correctness of work {@link jdk.test.lib.Utils#getRandomInstance()}.
+ * Test works in three modes: same seed provided, no seed provided and
+ * different seed provided. In the first case the test expects that all random numbers
+ * will be repeated in all next iterations. For other two modes test expects that
+ * randomly generated numbers differ from original.
+ */
+public class RandomGeneratorTest {
+ private static final String SEED_VM_OPTION = "-D" + Utils.SEED_PROPERTY_NAME + "=";
+
+ public static void main( String[] args) throws Throwable {
+ if (args.length == 0) {
+ throw new Error("TESTBUG: No test mode provided.");
+ }
+ SeedOption seedOpt = SeedOption.valueOf(args[0]);
+ List<String> jvmArgs = new ArrayList<String>();
+ String optStr = seedOpt.getSeedOption();
+ if (optStr != null) {
+ jvmArgs.add(optStr);
+ }
+ jvmArgs.add(RandomRunner.class.getName());
+ String origFileName = seedOpt.name() + "_orig";
+ jvmArgs.add(origFileName);
+ int fileNameIndex = jvmArgs.size() - 1;
+ String[] cmdLineArgs = jvmArgs.toArray(new String[jvmArgs.size()]);
+ ProcessTools.executeTestJvm(cmdLineArgs).shouldHaveExitValue(0);
+ String etalon = Utils.fileAsString(origFileName).trim();
+ cmdLineArgs[fileNameIndex] = seedOpt.name();
+ seedOpt.verify(etalon, cmdLineArgs);
+ }
+
+ /**
+ * The utility enum helps to generate an appropriate string that should be passed
+ * to the command line depends on the testing mode. It is also responsible for the result
+ * validation.
+ */
+ private enum SeedOption {
+ SAME_SEED {
+ @Override
+ public String getSeedOption() {
+ return SEED_VM_OPTION + Utils.SEED;
+ }
+
+ @Override
+ protected boolean isOutputExpected(String orig, String output) {
+ return output.equals(orig);
+ }
+ },
+ DIFFERENT_SEED {
+ @Override
+ public String getSeedOption() {
+ return SEED_VM_OPTION + Utils.getRandomInstance().nextLong();
+ }
+
+ @Override
+ public void verify(String orig, String[] cmdLine) {
+ cmdLine[0] = getSeedOption();
+ super.verify(orig, cmdLine);
+ }
+ },
+ NO_SEED {
+ @Override
+ public String getSeedOption() {
+ return null;
+ }
+ };
+
+ /**
+ * Generates a string to be added as a command line argument.
+ * It contains "-D" prefix, system property name, '=' sign
+ * and seed value.
+ * @return command line argument
+ */
+ public abstract String getSeedOption();
+
+ protected boolean isOutputExpected(String orig, String output) {
+ return !output.equals(orig);
+ }
+
+ /**
+ * Verifies that the original output meets expectations
+ * depending on the test mode. It compares the output of second execution
+ * to original one.
+ * @param orig original output
+ * @param cmdLine command line arguments
+ * @throws Throwable - Throws an exception in case test failure.
+ */
+ public void verify(String orig, String[] cmdLine) {
+ String output;
+ OutputAnalyzer oa;
+ try {
+ oa = ProcessTools.executeTestJvm(cmdLine);
+ } catch (Throwable t) {
+ throw new Error("TESTBUG: Unexpedted exception during jvm execution.", t);
+ }
+ oa.shouldHaveExitValue(0);
+ try {
+ output = Utils.fileAsString(name()).trim();
+ } catch (IOException ioe) {
+ throw new Error("TESTBUG: Problem during IO operation with file: " + name(), ioe);
+ }
+ if (!isOutputExpected(orig, output)) {
+ System.err.println("Initial output: " + orig);
+ System.err.println("Second run output: " + output);
+ throw new AssertionError("Unexpected random number sequence for mode: " + this.name());
+ }
+ }
+ }
+
+ /**
+ * The helper class generates several random numbers
+ * and put results to a file. The file name came as first
+ * command line argument.
+ */
+ public static class RandomRunner {
+ private static final int COUNT = 10;
+ public static void main(String[] args) {
+ StringBuilder sb = new StringBuilder();
+ Random rng = Utils.getRandomInstance();
+ for (int i = 0; i < COUNT; i++) {
+ sb.append(rng.nextLong()).append(' ');
+ }
+ try (PrintWriter pw = new PrintWriter(new FileWriter(args[0]))) {
+ pw.write(sb.toString());
+ } catch (IOException ioe) {
+ throw new Error("TESTBUG: Problem during IO operation with file: " + args[0], ioe);
+ }
+ }
+ }
+}