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   * Licensed to the Apache Software Foundation (ASF) under one
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   * 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
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   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
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   * See the License for the specific language governing permissions and
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  package org.apache.cassandra.harry.test;
  
  import accord.utils.Invariants;
  import org.apache.cassandra.harry.ColumnSpec;
  import org.apache.cassandra.harry.SchemaSpec;
  import org.apache.cassandra.harry.dsl.HistoryBuilder;
  import org.apache.cassandra.harry.gen.InvertibleGenerator;
  import org.junit.Assert;
  import org.junit.Test;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import static org.apache.cassandra.harry.checker.TestHelper.withRandom;
  import static org.apache.cassandra.harry.gen.InvertibleGenerator.MAX_ENTROPY;
  
  public class SimpleBijectionTest
  {
      @Test
      public void testOrder()
      {
          withRandom(rng -> {
              for (ColumnSpec.DataType<?> t : ColumnSpec.TYPES)
              {
                  for (ColumnSpec.DataType type : new ColumnSpec.DataType[]{ t, ColumnSpec.ReversedType.cache.get(t) })
                  {
                      ColumnSpec<Object> column = (ColumnSpec<Object>) ColumnSpec.regularColumn("regular", type);
                      InvertibleGenerator<Object> generator = InvertibleGenerator.fromType(rng,100, column);
  
  
                      Object previous = null;
                      for (int i = 0; i < generator.population(); i++)
                      {
                          Object next = generator.inflate(generator.descriptorAt(i));
                          if (previous != null)
                          {
                              Invariants.require(column.type.comparator().compare(next, previous) > 0,
                                                    "%s should be > %s", next, previous);
                          }
                          previous = next;
                      }
                  }
              }
          });
      }
  
      @Test
      public void testArrayOrder()
      {
          withRandom(rng -> {
              for (boolean[] order : new boolean[][]{ { false, false }, { true, false }, { false, true }, { true, true } })
              {
                  List<ColumnSpec<?>> columns = new ArrayList<>();
                  for (int i = 0; i < order.length; i++)
                      columns.add(ColumnSpec.ck("test", ColumnSpec.asciiType, order[i]));
                  InvertibleGenerator<Object[]> generator = new InvertibleGenerator<>(rng,
                                                                                      MAX_ENTROPY,
                                                                                      100,
                                                                                      SchemaSpec.forKeys(columns),
                                                                                      (Object[] a, Object[] b) -> HistoryBuilder.compareKeys(columns, a, b));
                  Object[] previous = null;
                  for (int i = 0; i < 100; i++)
                  {
                      long descr = generator.descriptorAt(i);
                      Object[] next = generator.inflate(descr);
                      if (previous != null)
                          Assert.assertTrue( HistoryBuilder.compareKeys(columns, next, previous) > 0);
                      Assert.assertEquals(descr, generator.deflate(next));
                      previous = next;
                  }
              }
          });
      }
  
      // TODO (now): negative tests
  }
  