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1   //Licensed to the Apache Software Foundation (ASF) under one
2   //or more contributor license agreements.  See the NOTICE file
3   //distributed with this work for additional information
4   //regarding copyright ownership.  The ASF licenses this file
5   //to you under the Apache License, Version 2.0 (the
6   //"License"); you may not use this file except in compliance
7   //with the License.  You may obtain a copy of the License at
8   
9   //https://www.apache.org/licenses/LICENSE-2.0
10  
11  //Unless required by applicable law or agreed to in writing,
12  //software distributed under the License is distributed on an
13  //"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14  //KIND, either express or implied.  See the License for the
15  //specific language governing permissions and limitations
16  //under the License.
17  
18  package org.hipparchus.random;
19  
20  import org.hipparchus.UnitTestUtils;
21  import org.junit.Assert;
22  import org.junit.Test;
23  
24  
25  public class UniformRandomGeneratorTest {
26  
27      @Test
28      public void testMeanAndStandardDeviation() {
29          RandomGenerator rg = new JDKRandomGenerator();
30          rg.setSeed(17399225432l);
31          UniformRandomGenerator generator = new UniformRandomGenerator(rg);
32          double[] sample = new double[10000];
33          for (int i = 0; i < sample.length; ++i) {
34              sample[i] = generator.nextNormalizedDouble();
35          }
36          Assert.assertEquals(0.0, UnitTestUtils.mean(sample), 0.07);
37          Assert.assertEquals(1.0, UnitTestUtils.variance(sample), 0.02);
38      }
39  
40  }