| /* |
| * 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.math3.distribution; |
| |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| /** |
| * Test cases for ConstantRealDistribution. |
| */ |
| public class ConstantRealDistributionTest extends RealDistributionAbstractTest { |
| |
| // --- Override tolerance ------------------------------------------------- |
| |
| @Override |
| public void setUp() { |
| super.setUp(); |
| setTolerance(0); |
| } |
| |
| //--- Implementations for abstract methods -------------------------------- |
| |
| /** Creates the default uniform real distribution instance to use in tests. */ |
| @Override |
| public ConstantRealDistribution makeDistribution() { |
| return new ConstantRealDistribution(1); |
| } |
| |
| /** Creates the default cumulative probability distribution test input values */ |
| @Override |
| public double[] makeCumulativeTestPoints() { |
| return new double[] {0, 0.5, 1}; |
| } |
| |
| /** Creates the default cumulative probability distribution test expected values */ |
| @Override |
| public double[] makeCumulativeTestValues() { |
| return new double[] {0, 0, 1}; |
| } |
| |
| /** Creates the default probability density test expected values */ |
| @Override |
| public double[] makeDensityTestValues() { |
| return new double[] {0, 0, 1}; |
| } |
| |
| /** Override default test, verifying that inverse cum is constant */ |
| @Override |
| @Test |
| public void testInverseCumulativeProbabilities() { |
| RealDistribution dist = getDistribution(); |
| for (double x : getCumulativeTestValues()) { |
| Assert.assertEquals(1,dist.inverseCumulativeProbability(x), 0); |
| } |
| } |
| |
| //--- Additional test cases ----------------------------------------------- |
| |
| @Test |
| public void testMeanVariance() { |
| ConstantRealDistribution dist; |
| |
| dist = new ConstantRealDistribution(-1); |
| Assert.assertEquals(dist.getNumericalMean(), -1, 0d); |
| Assert.assertEquals(dist.getNumericalVariance(), 0, 0d); |
| } |
| |
| @Test |
| public void testSampling() { |
| ConstantRealDistribution dist = new ConstantRealDistribution(0); |
| for (int i = 0; i < 10; i++) { |
| Assert.assertEquals(0, dist.sample(), 0); |
| } |
| |
| } |
| } |