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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.beam.sdk.nexmark.queries.sql;
  
  import java.util.List;
  import org.apache.beam.sdk.nexmark.model.AuctionPrice;
  import org.apache.beam.sdk.nexmark.model.Bid;
  import org.apache.beam.sdk.nexmark.model.Event;
  import org.apache.beam.sdk.testing.PAssert;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.apache.beam.sdk.transforms.Create;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList;
  import org.joda.time.Instant;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.experimental.runners.Enclosed;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Unit tests for {@link SqlQuery2}. */
  @RunWith(Enclosed.class)
  public class SqlQuery2Test {
  
    private static final List<Bid> BIDS =
        ImmutableList.of(
            newBid(1L),
            newBid(2L),
            newBid(3L),
            newBid(4L),
            newBid(5L),
            newBid(6L),
            newBid(7L),
            newBid(8L));
  
    private static final List<Event> BIDS_EVENTS =
        ImmutableList.of(
            new Event(BIDS.get(0)),
            new Event(BIDS.get(1)),
            new Event(BIDS.get(2)),
            new Event(BIDS.get(3)),
            new Event(BIDS.get(4)),
            new Event(BIDS.get(5)),
            new Event(BIDS.get(6)),
            new Event(BIDS.get(7)));
  
    private static final List<AuctionPrice> BIDS_EVEN =
        ImmutableList.of(
            newAuctionPrice(BIDS.get(1)),
            newAuctionPrice(BIDS.get(3)),
            newAuctionPrice(BIDS.get(5)),
            newAuctionPrice(BIDS.get(7)));
  
    private static final List<AuctionPrice> BIDS_EVERY_THIRD =
        ImmutableList.of(newAuctionPrice(BIDS.get(2)), newAuctionPrice(BIDS.get(5)));
  
    private abstract static class SqlQuery2TestCases {
      protected abstract SqlQuery2 getQuery(long skipFactor);
  
      @Rule public TestPipeline testPipeline = TestPipeline.create();
  
      @Test
      public void testSkipsEverySecondElement() {
        PCollection<Event> bids = testPipeline.apply(Create.of(BIDS_EVENTS));
        PAssert.that(bids.apply(getQuery(2))).containsInAnyOrder(BIDS_EVEN);
        testPipeline.run();
      }
  
      @Test
      public void testSkipsEveryThirdElement() {
        PCollection<Event> bids = testPipeline.apply(Create.of(BIDS_EVENTS));
        PAssert.that(bids.apply(getQuery(3))).containsInAnyOrder(BIDS_EVERY_THIRD);
        testPipeline.run();
      }
    }
  
    @RunWith(JUnit4.class)
    public static class SqlQuery2TestCalcite extends SqlQuery2TestCases {
      @Override
      protected SqlQuery2 getQuery(long skipFactor) {
        return SqlQuery2.calciteSqlQuery2(skipFactor);
      }
    }
  
    private static Bid newBid(long id) {
      return new Bid(id, 3L, 100L, new Instant(432342L + id), "extra_" + id);
    }
  
    private static AuctionPrice newAuctionPrice(Bid bid) {
      return new AuctionPrice(bid.auction, bid.price);
    }
  }
  