content: /*
   * 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.impl.transform.agg;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotNull;
  
  import java.util.Arrays;
  import java.util.List;
  import org.apache.beam.sdk.coders.BooleanCoder;
  import org.apache.beam.sdk.coders.CannotProvideCoderException;
  import org.apache.beam.sdk.coders.CoderRegistry;
  import org.apache.beam.sdk.transforms.Combine;
  import org.junit.Test;
  
  /** Unit tests for {@link CountIf}. */
  public class CountIfTest {
  
    @Test
    public void testCreatesEmptyAccumulator() {
      long[] accumulator = (long[]) CountIf.combineFn().createAccumulator();
  
      assertEquals(0, accumulator[0]);
    }
  
    @Test
    public void testReturnsAccumulatorUnchangedForNullInput() {
      Combine.CombineFn countIfFn = CountIf.combineFn();
      long[] accumulator = (long[]) countIfFn.addInput(countIfFn.createAccumulator(), null);
  
      assertEquals(0L, accumulator[0]);
    }
  
    @Test
    public void testAddsInputToAccumulator() {
      Combine.CombineFn countIfFn = CountIf.combineFn();
      long[] accumulator = (long[]) countIfFn.addInput(countIfFn.createAccumulator(), Boolean.TRUE);
  
      assertEquals(1L, accumulator[0]);
    }
  
    @Test
    public void testCreatesAccumulatorCoder() throws CannotProvideCoderException {
      assertNotNull(
          CountIf.combineFn().getAccumulatorCoder(CoderRegistry.createDefault(), BooleanCoder.of()));
    }
  
    @Test
    public void testMergeAccumulators() {
      Combine.CombineFn countIfFn = CountIf.combineFn();
      List<long[]> accums = Arrays.asList(new long[] {2}, new long[] {2});
      long[] accumulator = (long[]) countIfFn.mergeAccumulators(accums);
  
      assertEquals(4L, accumulator[0]);
    }
  
    @Test
    public void testExtractsOutput() {
      Combine.CombineFn countIfFn = CountIf.combineFn();
  
      assertEquals(0L, countIfFn.extractOutput(countIfFn.createAccumulator()));
    }
  }
  