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 CollectListAggFunc}. */
  public class CollectListAggFuncTest {
      @Test
      void testCollectListAggregationFunction() {
          final CollectListAggFunc aggFunc = new CollectListAggFunc(DataTypes.STRING());
  
          CollectListAggFunc.RawDataAccumulator<Object> accumulator = aggFunc.createAccumulator();
          assertThat((Object[]) aggFunc.getResult(accumulator)).isEmpty();
  
          aggFunc.add(accumulator, "a", 0);
          aggFunc.add(accumulator, "a", 0);
          aggFunc.add(accumulator, "b", 0);
          assertThat(aggFunc.getResult(accumulator)).isEqualTo(new String[] {"a", "a", "b"});
  
          aggFunc.retract(accumulator, "a");
          Object result = aggFunc.getResult(accumulator);
          assertThat(result).isEqualTo(new String[] {"a", "b"});
  
          aggFunc.add(accumulator, "b", 0);
          assertThat(result).isEqualTo(new String[] {"a", "b"});
      }
  }
  