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
   * limitations under the License.
   */
  
  package accord.utils;
  
  import java.util.List;
  import java.util.stream.IntStream;
  
  import com.google.common.primitives.Ints;
  import org.junit.jupiter.api.Test;
  
  import static accord.utils.Property.qt;
  import static accord.utils.Utils.reduce;
  import static org.assertj.core.api.Assertions.assertThat;
  
  class UtilsTest
  {
      @Test
      public void simpleReduce()
      {
          qt().forAll(Gens.arrays(Gens.ints().all()).ofSizeBetween(0, 10)).check(array -> {
              List<Integer> list = Ints.asList(array);
  
              // filter doesn't return non matches
              assertThat(reduce(true, list, v -> v % 2 == 0, (acc, v) -> acc & (v % 2 == 0))).isTrue();
              // count
              assertThat(reduce(0, list, i -> true, (acc, v) -> acc + 1)).isEqualTo(array.length);
              // sum
              assertThat(reduce(0, list, i -> true, (acc, v) -> acc + v)).isEqualTo(IntStream.of(array).sum());
          });
      }
  }