content: /*
   * 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 accord.burn.random;
  
  import accord.utils.Gen;
  import accord.utils.Gens;
  import accord.utils.RandomSource;
  import org.assertj.core.api.Assertions;
  import org.junit.jupiter.api.Test;
  
  import java.util.Arrays;
  
  import static accord.utils.Property.qt;
  
  class RandomRangeTest
  {
      @Test
      void intRange()
      {
          test((ignore, min, max) -> new IntRange(min, max));
      }
  
      @Test
      void randomWalkRange()
      {
          test(RandomWalkRange::new);
      }
  
      void test(Factory factory)
      {
          int samples = 1000;
          qt().forAll(Gens.random(), ranges()).check((rs, range) -> {
              Gen.LongGen randRange = factory.create(rs, range.min, range.max);
              for (int i = 0; i < samples; i++)
                  Assertions.assertThat(randRange.nextLong(rs)).isBetween((long) range.min, (long) range.max);
          });
      }
  
      private static Gen<Range> ranges()
      {
          Range range = new Range();
          Gen<Integer> numGen = Gens.ints().between(0, 1000);
          int[] buffer = new int[2];
          return rs -> {
              buffer[0] = numGen.next(rs);
              do
              {
                  buffer[1] = numGen.next(rs);
              }
              while (buffer[0] == buffer[1]);
              Arrays.sort(buffer);
              range.min = buffer[0];
              range.max = buffer[1];
              return range;
          };
      }
  
      private static class Range
      {
          int min, max;
      }
  
      private interface Factory
      {
          Gen.LongGen create(RandomSource random, int min, int max);
      }
  }