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.junit.jupiter.api.Test;
  
  import static org.assertj.core.api.Assertions.assertThat;
  
  /** Test for {@link CountAggFunc}. */
  class CountAggFuncTest {
      @Test
      void testCountAggregationFunction() {
          final CountAggFunc aggFunc = new CountAggFunc();
          CountAggFunc.CountAccumulator accumulator = aggFunc.createAccumulator();
          assertThat(aggFunc.getResult(accumulator)).isEqualTo(0);
          aggFunc.add(accumulator, 1L, 0);
          CountAggFunc.CountAccumulator accumulator2 = new CountAggFunc.CountAccumulator();
          accumulator2.cnt = 2L;
          aggFunc.merge(accumulator, accumulator2);
          assertThat(aggFunc.getResult(accumulator)).isEqualTo(3);
          aggFunc.retract(accumulator, 1L);
          assertThat(aggFunc.getResult(accumulator)).isEqualTo(2);
      }
  }
  