/*
    * 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.hadoop.hbase.util;
  
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  import java.util.HashSet;
  import java.util.Random;
  import java.util.Set;
  
  import org.apache.hadoop.hbase.testclassification.SmallTests;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  
  @Category(SmallTests.class)
  public class TestLoadTestKVGenerator {
  
    private static final int MIN_LEN = 10;
    private static final int MAX_LEN = 20;
  
    private Random rand = new Random(28937293L);
    private LoadTestKVGenerator gen = new LoadTestKVGenerator(MIN_LEN, MAX_LEN);
  
    @Test
    public void testValueLength() {
      for (int i = 0; i < 1000; ++i) {
        byte[] v = gen.generateRandomSizeValue(Bytes.toBytes(Integer.toString(i)),
            Bytes.toBytes(String.valueOf(rand.nextInt())));
        assertTrue(MIN_LEN <= v.length);
        assertTrue(v.length <= MAX_LEN);
      }
    }
  
    @Test
    public void testVerification() {
      for (int i = 0; i < 1000; ++i) {
        for (int qualIndex = 0; qualIndex < 20; ++qualIndex) {
          byte[] qual = Bytes.toBytes(String.valueOf(qualIndex));
          byte[] rowKey = Bytes.toBytes(LoadTestKVGenerator.md5PrefixedKey(i));
          byte[] v = gen.generateRandomSizeValue(rowKey, qual);
          assertTrue(LoadTestKVGenerator.verify(v, rowKey, qual));
          v[0]++;
          assertFalse(LoadTestKVGenerator.verify(v, rowKey, qual));
        }
      }
    }
  
    @Test
    public void testCorrectAndUniqueKeys() {
      Set<String> keys = new HashSet<String>();
      for (int i = 0; i < 1000; ++i) {
        String k = LoadTestKVGenerator.md5PrefixedKey(i);
        assertFalse(keys.contains(k));
        assertTrue(k.endsWith("-" + i));
        keys.add(k);
      }
    }
  
  }