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/*
* Copyright (c) 2014, 2020, 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
* @key randomness
* @summary Verify correctnes of the random generator from Utils.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);
}
}
}
}
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