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   * 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.db.rows;
  
  import java.util.function.Function;
  
  import com.google.common.collect.ImmutableList;
  import org.junit.Assert;
  import org.junit.Test;
  
  import org.apache.cassandra.db.LivenessInfo;
  
  import static org.quicktheories.QuickTheory.qt;
  import static org.quicktheories.generators.SourceDSL.integers;
  import static org.quicktheories.generators.SourceDSL.longs;
  
  public class EncodingStatsTest
  {
      @Test
      public void testCollectWithNoStats()
      {
          EncodingStats none = EncodingStats.merge(ImmutableList.of(
              EncodingStats.NO_STATS,
              EncodingStats.NO_STATS,
              EncodingStats.NO_STATS
          ), Function.identity());
          Assert.assertEquals(none, EncodingStats.NO_STATS);
      }
  
      @Test
      public void testCollectWithNoStatsWithEmpty()
      {
          EncodingStats none = EncodingStats.merge(ImmutableList.of(
              EncodingStats.NO_STATS,
              EncodingStats.NO_STATS,
              new EncodingStats(LivenessInfo.NO_TIMESTAMP, LivenessInfo.NO_EXPIRATION_TIME, 0)
          ), Function.identity());
          Assert.assertEquals(none, EncodingStats.NO_STATS);
      }
  
      @Test
      public void testCollectWithNoStatsWithTimestamp()
      {
          EncodingStats single = new EncodingStats(1, LivenessInfo.NO_EXPIRATION_TIME, 0);
          EncodingStats result = EncodingStats.merge(ImmutableList.of(
              EncodingStats.NO_STATS,
              EncodingStats.NO_STATS,
              single,
              EncodingStats.NO_STATS
          ), Function.identity());
          Assert.assertEquals(single, result);
      }
  
      @Test
      public void testCollectWithNoStatsWithExpires()
      {
          EncodingStats single = new EncodingStats(LivenessInfo.NO_TIMESTAMP, 1, 0);
          EncodingStats result = EncodingStats.merge(ImmutableList.of(
          EncodingStats.NO_STATS,
          single,
          EncodingStats.NO_STATS
          ), Function.identity());
          Assert.assertEquals(single, result);
      }
  
      @Test
      public void testCollectWithNoStatsWithTTL()
      {
          EncodingStats single = new EncodingStats(LivenessInfo.NO_TIMESTAMP, LivenessInfo.NO_EXPIRATION_TIME, 1);
          EncodingStats result = EncodingStats.merge(ImmutableList.of(
              EncodingStats.NO_STATS,
              single,
              EncodingStats.NO_STATS
          ), Function.identity());
          Assert.assertEquals(single, result);
      }
  
      @Test
      public void testCollectOneEach()
      {
          EncodingStats tsp = new EncodingStats(1, LivenessInfo.NO_EXPIRATION_TIME, 0);
          EncodingStats exp = new EncodingStats(LivenessInfo.NO_TIMESTAMP, 1, 0);
          EncodingStats ttl = new EncodingStats(LivenessInfo.NO_TIMESTAMP, LivenessInfo.NO_EXPIRATION_TIME, 1);
          EncodingStats result = EncodingStats.merge(ImmutableList.of(
              tsp,
              exp,
              ttl
          ), Function.identity());
          Assert.assertEquals(new EncodingStats(1, 1, 1), result);
      }
  
      @Test
      public void testTimestamp()
      {
          EncodingStats one = new EncodingStats(1, LivenessInfo.NO_EXPIRATION_TIME, 0);
          EncodingStats two = new EncodingStats(2, LivenessInfo.NO_EXPIRATION_TIME, 0);
          EncodingStats thr = new EncodingStats(3, LivenessInfo.NO_EXPIRATION_TIME, 0);
          EncodingStats result = EncodingStats.merge(ImmutableList.of(
              one,
              two,
              thr
          ), Function.identity());
          Assert.assertEquals(one, result);
      }
  
      @Test
      public void testExpires()
      {
          EncodingStats one = new EncodingStats(LivenessInfo.NO_TIMESTAMP,1, 0);
          EncodingStats two = new EncodingStats(LivenessInfo.NO_TIMESTAMP,2, 0);
          EncodingStats thr = new EncodingStats(LivenessInfo.NO_TIMESTAMP,3, 0);
          EncodingStats result = EncodingStats.merge(ImmutableList.of(
              one,
              two,
              thr
          ), Function.identity());
          Assert.assertEquals(one, result);
      }
  
      @Test
      public void testTTL()
      {
          EncodingStats one = new EncodingStats(LivenessInfo.NO_TIMESTAMP, LivenessInfo.NO_EXPIRATION_TIME,1);
          EncodingStats two = new EncodingStats(LivenessInfo.NO_TIMESTAMP, LivenessInfo.NO_EXPIRATION_TIME,2);
          EncodingStats thr = new EncodingStats(LivenessInfo.NO_TIMESTAMP, LivenessInfo.NO_EXPIRATION_TIME,3);
          EncodingStats result = EncodingStats.merge(ImmutableList.of(
              thr,
              one,
              two
          ), Function.identity());
          Assert.assertEquals(one, result);
      }
  
      @Test
      public void testEncodingStatsCollectWithNone()
      {
          qt().forAll(longs().between(Long.MIN_VALUE+1, Long.MAX_VALUE),
                      integers().between(0, Integer.MAX_VALUE-1),
                      integers().allPositive())
              .asWithPrecursor(EncodingStats::new)
              .check((timestamp, expires, ttl, stats) ->
                     {
                         EncodingStats result = EncodingStats.merge(ImmutableList.of(
                             EncodingStats.NO_STATS,
                             stats,
                             EncodingStats.NO_STATS
                         ), Function.identity());
                         return result.minTTL == ttl
                                && result.minLocalDeletionTime == expires
                                && result.minTimestamp == timestamp;
                     });
      }
  
  }
  