/*
    * 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.math4.legacy.stat.interval;
  
  import org.junit.Assert;
  import org.junit.Test;
  
  /**
   * Test cases for the IntervalUtils class.
   *
   */
  public class IntervalUtilsTest {
  
      private final int successes = 50;
      private final int trials = 500;
      private final double confidenceLevel = 0.9;
  
      // values to test must be exactly the same
      private final double eps = 0.0;
  
      @Test
      public void testAgrestiCoull() {
          checkConfidenceIntervals(new AgrestiCoullInterval().createInterval(trials, successes, confidenceLevel),
                                   IntervalUtils.getAgrestiCoullInterval(trials, successes, confidenceLevel));
      }
  
      @Test
      public void testClopperPearson() {
          checkConfidenceIntervals(new ClopperPearsonInterval().createInterval(trials, successes, confidenceLevel),
                                   IntervalUtils.getClopperPearsonInterval(trials, successes, confidenceLevel));
      }
  
      @Test
      public void testNormalApproximation() {
          checkConfidenceIntervals(new NormalApproximationInterval().createInterval(trials, successes, confidenceLevel),
                                   IntervalUtils.getNormalApproximationInterval(trials, successes, confidenceLevel));
      }
  
      @Test
      public void testWilsonScore() {
          checkConfidenceIntervals(new WilsonScoreInterval().createInterval(trials, successes, confidenceLevel),
                                   IntervalUtils.getWilsonScoreInterval(trials, successes, confidenceLevel));
      }
  
      private void checkConfidenceIntervals(ConfidenceInterval expected, ConfidenceInterval actual) {
          Assert.assertEquals(expected.getLowerBound(), actual.getLowerBound(), eps);
          Assert.assertEquals(expected.getUpperBound(), actual.getUpperBound(), eps);
          Assert.assertEquals(expected.getConfidenceLevel(), actual.getConfidenceLevel(), eps);
      }
  }