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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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  package org.apache.cassandra.index.sai.disk.v1.bbtree;
  
  import java.nio.ByteBuffer;
  
  import com.google.common.collect.Lists;
  import org.junit.Test;
  
  import org.apache.cassandra.index.sai.disk.ResettableByteBuffersIndexOutput;
  import org.apache.cassandra.index.sai.disk.io.SeekingRandomAccessInput;
  import org.apache.cassandra.index.sai.utils.SAIRandomizedTester;
  import org.apache.lucene.store.ByteBuffersDataInput;
  import org.apache.lucene.store.ByteBuffersIndexInput;
  import org.apache.lucene.store.IndexInput;
  import org.apache.lucene.util.LongValues;
  import org.apache.lucene.util.packed.DirectReader;
  import org.apache.lucene.util.packed.DirectWriter;
  
  import static org.junit.Assert.assertEquals;
  
  public class LeafOrderMapTest extends SAIRandomizedTester
  {
      @Test
      public void test() throws Exception
      {
          int[] array = new int[1024];
          for (int x=0; x < array.length; x++)
          {
              array[x] = x;
          }
          shuffle(array);
  
          ResettableByteBuffersIndexOutput out = new ResettableByteBuffersIndexOutput("");
  
          LeafOrderMap.write(array, array.length, array.length - 1, out);
  
          IndexInput input = new ByteBuffersIndexInput(new ByteBuffersDataInput(Lists.newArrayList(ByteBuffer.wrap(out.toArrayCopy()))), "");
  
          final byte bits = (byte) DirectWriter.unsignedBitsRequired(array.length - 1);
  
          for (int index = 0; index < array.length; index++)
          {
              LongValues reader = DirectReader.getInstance(new SeekingRandomAccessInput(input), bits);
  
              int value = Math.toIntExact(reader.get(index));
  
              assertEquals(array[index], value);
          }
      }
  }
  