content: /*
   * Copyright 2022 The FeatHub Authors
   *
   * Licensed 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
   *
   *     https://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 com.alibaba.feathub.flink.udf.aggregation;
  
  import org.apache.flink.table.api.DataTypes;
  
  import org.junit.jupiter.api.Test;
  
  import static org.assertj.core.api.Assertions.assertThat;
  
  /** Test for {@link AggFuncWithLimit}. */
  public class AggFuncWithLimitTest {
      @Test
      void testAggFuncWithLimit() {
          final MinMaxAggFunc<Integer> internalAggFunc = new MinMaxAggFunc<>(DataTypes.INT(), true);
          AggFuncWithLimit<Integer, Integer, MinMaxAggFunc.MinMaxAccumulator<Integer>> aggFunc =
                  new AggFuncWithLimit<>(internalAggFunc, 3);
          innerTest(aggFunc, true);
  
          aggFunc = new AggFuncWithLimitWithoutRetract<>(internalAggFunc, 3);
          innerTest(aggFunc, false);
      }
  
      private static void innerTest(
              AggFuncWithLimit<Integer, Integer, MinMaxAggFunc.MinMaxAccumulator<Integer>> aggFunc,
              boolean testRetract) {
          AggFuncWithLimit.RawDataAccumulator<Integer> acc1 = aggFunc.createAccumulator();
          aggFunc.add(acc1, 1, 1L);
          aggFunc.add(acc1, 2, 2L);
          assertThat(aggFunc.getResult(acc1)).isEqualTo(1);
  
          AggFuncWithLimit.RawDataAccumulator<Integer> acc2 = aggFunc.createAccumulator();
          aggFunc.add(acc2, 3, 3L);
          aggFunc.add(acc2, 4, 4L);
          assertThat(aggFunc.getResult(acc2)).isEqualTo(3);
  
          AggFuncWithLimit.RawDataAccumulator<Integer> acc = aggFunc.createAccumulator();
          aggFunc.merge(acc, acc1);
          aggFunc.merge(acc, acc2);
          assertThat(aggFunc.getResult(acc)).isEqualTo(2);
  
          if (testRetract) {
              aggFunc.retractAccumulator(acc, acc1);
              assertThat(aggFunc.getResult(acc)).isEqualTo(3);
          }
      }
  }
  