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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
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  package org.apache.beam.sdk.extensions.sql.meta.provider.kafka;
  
  import static java.nio.charset.StandardCharsets.UTF_8;
  
  import java.util.List;
  import org.apache.beam.sdk.extensions.sql.impl.BeamTableStatistics;
  import org.apache.beam.sdk.schemas.Schema;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList;
  import org.junit.Assert;
  import org.junit.Test;
  
  public class BeamKafkaTableStatisticsTest {
    @Test
    public void testOrderedArrivalSinglePartitionRate() {
      KafkaTestTable table = testTable(1);
      for (int i = 0; i < 100; i++) {
        table.addRecord(createKafkaTestRecord("k" + i, i, 500L * i));
      }
  
      BeamTableStatistics stats = table.getTableStatistics(null);
      Assert.assertEquals(2d, stats.getRate(), 0.001);
    }
  
    @Test
    public void testOrderedArrivalMultiplePartitionsRate() {
      KafkaTestTable table = testTable(3);
      for (int i = 0; i < 100; i++) {
        table.addRecord(createKafkaTestRecord("k" + i, i, 500L * i));
      }
  
      BeamTableStatistics stats = table.getTableStatistics(null);
      Assert.assertEquals(2d, stats.getRate(), 0.001);
    }
  
    @Test
    public void testOnePartitionAheadRate() {
      KafkaTestTable table = testTable(3);
      for (int i = 0; i < 100; i++) {
        table.addRecord(createKafkaTestRecord("1", i, 1000L * i));
        table.addRecord(createKafkaTestRecord("2", i, 500L * i));
      }
  
      table.setNumberOfRecordsForRate(20);
      BeamTableStatistics stats = table.getTableStatistics(null);
      Assert.assertEquals(1d, stats.getRate(), 0.001);
    }
  
    @Test
    public void testLateRecords() {
      KafkaTestTable table = testTable(3);
  
      table.addRecord(createKafkaTestRecord("1", 132, 1000L));
      for (int i = 0; i < 98; i++) {
        table.addRecord(createKafkaTestRecord("1", i, 500L));
      }
      table.addRecord(createKafkaTestRecord("1", 133, 2000L));
  
      table.setNumberOfRecordsForRate(200);
      BeamTableStatistics stats = table.getTableStatistics(null);
      Assert.assertEquals(1d, stats.getRate(), 0.001);
    }
  
    @Test
    public void testAllLate() {
      KafkaTestTable table = testTable(3);
  
      table.addRecord(createKafkaTestRecord("1", 132, 1000L));
      for (int i = 0; i < 98; i++) {
        table.addRecord(createKafkaTestRecord("1", i, 500L));
      }
  
      table.setNumberOfRecordsForRate(200);
      BeamTableStatistics stats = table.getTableStatistics(null);
      Assert.assertTrue(stats.isUnknown());
    }
  
    @Test
    public void testEmptyPartitionsRate() {
      KafkaTestTable table = testTable(3);
      BeamTableStatistics stats = table.getTableStatistics(null);
      Assert.assertTrue(stats.isUnknown());
    }
  
    @Test
    public void allTheRecordsSameTimeRate() {
      KafkaTestTable table = testTable(3);
      for (int i = 0; i < 100; i++) {
        table.addRecord(createKafkaTestRecord("key" + i, i, 1000L));
      }
      BeamTableStatistics stats = table.getTableStatistics(null);
      Assert.assertTrue(stats.isUnknown());
    }
  
    private KafkaTestTable testTable(int partitionsPerTopic) {
      List<String> topics = ImmutableList.of("topic1", "topic2");
      Schema schema = Schema.builder().addInt32Field("f_int").build();
      return new KafkaTestTable(schema, topics, partitionsPerTopic);
    }
  
    private KafkaTestRecord createKafkaTestRecord(String key, Integer i, long timestamp) {
      return KafkaTestRecord.create(key, i.toString().getBytes(UTF_8), "topic1", timestamp);
    }
  }
  