//Licensed to the Apache Software Foundation (ASF) under one
//or more contributor license agreements.  See the NOTICE file
//distributed with this work for additional information
//regarding copyright ownership.  The ASF licenses this file
//to you under the Apache License, Version 2.0 (the
//"License"); you may not use this file except in compliance
//with the License.  You may obtain a copy of the License at

//http://www.apache.org/licenses/LICENSE-2.0

//Unless required by applicable law or agreed to in writing,
//software distributed under the License is distributed on an
//"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
//KIND, either express or implied.  See the License for the
//specific language governing permissions and limitations
//under the License.

package org.apache.commons.math.random;

import org.apache.commons.math.stat.StatUtils;

import junit.framework.*;

public class GaussianRandomGeneratorTest extends TestCase {

	public GaussianRandomGeneratorTest(String name) {
		super(name);
	}

	public void testMeanAndStandardDeviation() {
		RandomGenerator rg = new JDKRandomGenerator();
		rg.setSeed(17399225432l);
		GaussianRandomGenerator generator = new GaussianRandomGenerator(rg);
		double[] sample = new double[10000];
		for (int i = 0; i < sample.length; ++i) {
			sample[i] = generator.nextNormalizedDouble();
		}
		assertEquals(0.0, StatUtils.mean(sample), 0.012);
		assertEquals(1.0, StatUtils.variance(sample), 0.01);
	}

	public static Test suite() {
		return new TestSuite(GaussianRandomGeneratorTest.class);
	}

}
