/* ====================================================================
* The Apache Software License, Version 1.1
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* Copyright (c) 2003-2004 The Apache Software Foundation. All rights
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* "This product includes software developed by the
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*
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package org.apache.commons.math.random;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import java.net.URL;
import org.apache.commons.math.stat.DescriptiveStatistics;
import org.apache.commons.math.stat.StorelessDescriptiveStatisticsImpl;
/**
* Test cases for the ValueServer class.
*
* @version $Revision: 1.11 $ $Date: 2004/01/15 07:31:44 $
*/
public final class ValueServerTest extends TestCase {
private ValueServer vs = new ValueServer();
public ValueServerTest(String name) {
super(name);
}
public void setUp() {
vs.setMode(ValueServer.DIGEST_MODE);
try {
URL url = getClass().getResource("testData.txt");
vs.setValuesFileURL(url);
} catch (Exception ex) {
fail("malformed test URL");
}
}
public static Test suite() {
TestSuite suite = new TestSuite(ValueServerTest.class);
suite.setName("ValueServer Tests");
return suite;
}
/**
* Generate 1000 random values and make sure they look OK.<br>
* Note that there is a non-zero (but very small) probability that
* these tests will fail even if the code is working as designed.
*/
public void testNextDigest() throws Exception{
double next = 0.0;
double tolerance = 0.1;
vs.computeDistribution();
assertTrue("empirical distribution property",
vs.getEmpiricalDistribution() != null);
DescriptiveStatistics stats = new StorelessDescriptiveStatisticsImpl();
for (int i = 1; i < 1000; i++) {
next = vs.getNext();
stats.addValue(next);
}
assertEquals("mean", 5.069831575018909, stats.getMean(), tolerance);
assertEquals
("std dev", 1.0173699343977738, stats.getStandardDeviation(),
tolerance);
vs.computeDistribution(500);
stats = new StorelessDescriptiveStatisticsImpl();
for (int i = 1; i < 1000; i++) {
next = vs.getNext();
stats.addValue(next);
}
assertEquals("mean", 5.069831575018909, stats.getMean(), tolerance);
assertEquals
("std dev", 1.0173699343977738, stats.getStandardDeviation(),
tolerance);
}
/**
* Make sure exception thrown if digest getNext is attempted
* before loading empiricalDistribution.
*/
public void testNextDigestFail() throws Exception {
try {
vs.getNext();
fail("Expecting IllegalStateException");
} catch (IllegalStateException ex) {;}
}
/**
* Test ValueServer REPLAY_MODE using values in testData file.<br>
* Check that the values 1,2,1001,1002 match data file values 1 and 2.
* the sample data file.
*/
public void testReplay() throws Exception {
double firstDataValue = 4.038625496201205;
double secondDataValue = 3.6485326248346936;
double tolerance = 10E-15;
double compareValue = 0.0d;
vs.setMode(ValueServer.REPLAY_MODE);
vs.resetReplayFile();
compareValue = vs.getNext();
assertEquals(compareValue,firstDataValue,tolerance);
compareValue = vs.getNext();
assertEquals(compareValue,secondDataValue,tolerance);
for (int i = 3; i < 1001; i++) {
compareValue = vs.getNext();
}
compareValue = vs.getNext();
assertEquals(compareValue,firstDataValue,tolerance);
compareValue = vs.getNext();
assertEquals(compareValue,secondDataValue,tolerance);
vs.closeReplayFile();
// make sure no NPE
vs.closeReplayFile();
}
/**
* Test other ValueServer modes
*/
public void testModes() throws Exception {
vs.setMode(ValueServer.CONSTANT_MODE);
vs.setMu(0);
assertEquals("constant mode test",vs.getMu(),vs.getNext(),Double.MIN_VALUE);
vs.setMode(ValueServer.UNIFORM_MODE);
vs.setMu(2);
double val = vs.getNext();
assertTrue(val > 0 && val < 4);
vs.setSigma(1);
vs.setMode(ValueServer.GAUSSIAN_MODE);
val = vs.getNext();
assertTrue("gaussian value close enough to mean",
val < vs.getMu() + 100*vs.getSigma());
vs.setMode(ValueServer.EXPONENTIAL_MODE);
val = vs.getNext();
assertTrue(val > 0);
try {
vs.setMode(1000);
vs.getNext();
fail("bad mode, expecting IllegalStateException");
} catch (IllegalStateException ex) {
;
}
}
/**
* Test fill
*/
public void testFill() throws Exception {
vs.setMode(ValueServer.CONSTANT_MODE);
vs.setMu(2);
double[] val = new double[5];
vs.fill(val);
for (int i = 0; i < 5; i++) {
assertEquals("fill test in place",2,val[i],Double.MIN_VALUE);
}
double v2[] = vs.fill(3);
for (int i = 0; i < 3; i++) {
assertEquals("fill test in place",2,v2[i],Double.MIN_VALUE);
}
}
/**
* Test getters to make Clover happy
*/
public void testProperties() throws Exception {
vs.setMode(ValueServer.CONSTANT_MODE);
assertEquals("mode test",ValueServer.CONSTANT_MODE,vs.getMode());
vs.setValuesFileURL("http://www.apache.org");
URL url = vs.getValuesFileURL();
assertEquals("valuesFileURL test","http://www.apache.org",url.toString());
}
}