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 org.apache.cassandra.stress.generate;
  
  import org.junit.Test;
  
  import org.apache.cassandra.stress.settings.OptionDistribution;
  
  import static org.junit.Assert.*;
  
  public class DistributionSequenceTest
  {
      @Test
      public void simpleSequence() throws Exception
      {
          Distribution dist = OptionDistribution.get("seq(1..10)").get();
          assertTrue(dist instanceof DistributionSequence);
  
          assertEquals(1, dist.minValue());
          assertEquals(10, dist.maxValue());
          assertEquals(5, dist.average());
  
          assertEquals(1, dist.inverseCumProb(0d));
          assertEquals(10, dist.inverseCumProb(1d));
  
          long min = dist.next();
          assertEquals(1,min);
  
          long last = min;
          for (int i=0; i<9; i++)
          {
              long next = dist.next();
              assertEquals(next, last+1); //increase by one each step
              last = next;
          }
  
          assertEquals(1, dist.next()); // wrapping
      }
  
  
      @Test
      public void negValueSequence() throws Exception
      {
          Distribution dist = OptionDistribution.get("seq(-1000..-10)").get();
          assertTrue(dist instanceof DistributionSequence);
  
          assertEquals(-1000, dist.minValue());
          assertEquals( -10, dist.maxValue());
          assertEquals(-504, dist.average());
  
          assertEquals(-1000, dist.inverseCumProb(0d));
          assertEquals(-10, dist.inverseCumProb(1d));
  
          long min = dist.next();
          assertEquals(-1000, min);
  
          long last = min;
          long next = dist.next();
          while (last<next)
          {
              assertEquals(next, last+1); //increase by one each step
              last = next;
              next = dist.next();
          }
  
          assertEquals(-10, last); // wrapping
          assertEquals(-1000, next); // wrapping
      }
  
      @Test
      public void bigSequence() throws Exception
      {
          Distribution dist = OptionDistribution.get(String.format("seq(1..%d)", Long.MAX_VALUE)).get();
          assertTrue(dist instanceof DistributionSequence);
  
          assertEquals(1, dist.minValue());
          assertEquals(Long.MAX_VALUE, dist.maxValue());
  
          assertEquals(1, dist.inverseCumProb(0d));
          assertEquals(Long.MAX_VALUE, dist.inverseCumProb(1d));
  
      }
  
      @Test
      public void setSeed() throws Exception
      {
          Distribution dist = OptionDistribution.get("seq(1..10)").get();
          assertTrue(dist instanceof DistributionSequence);
  
          for (int seed=1; seed<500; seed+=seed)
          {
              dist.setSeed(seed);
              assertEquals(1, dist.minValue());
              assertEquals(10, dist.maxValue());
              assertEquals(5, dist.average());
  
              assertEquals(1, dist.inverseCumProb(0d));
              assertEquals(10, dist.inverseCumProb(1d));
  
              long last = dist.next();
              for (int i = 0; i < 9; i++)
              {
                  long next = dist.next();
                  if (next>1)
                  {
                      assertEquals(next, last + 1); //increase by one each step
                  }else{
                      assertEquals(last, 10); //wrap after the end
                  }
                  last = next;
              }
          }
      }
  }
  