content: /*
   * Copyright 2015, 2024 StreamEx contributors
   *
   * 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
   *
   *     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 one.util.streamex;
  
  import org.junit.Test;
  
  import java.util.*;
  
  import static one.util.streamex.TestHelpers.checkSpliterator;
  import static org.junit.Assert.*;
  
  /**
   * @author Tagir Valeev
   */
  public class CrossSpliteratorTest {
      @Test
      public void testCrossToList() {
          for (int limit : new int[] { 1, 2, 4, 9 }) {
              List<List<Integer>> input = Collections.nCopies(3, IntStreamEx.range(limit).boxed().toList());
              List<List<Integer>> expected = IntStreamEx.range(limit * limit * limit).mapToObj(
                  i -> Arrays.asList(i / limit / limit, i / limit % limit, i % limit)).toList();
              checkSpliterator("cross", expected, () -> new CrossSpliterator.ToList<>(input));
          }
      }
  
      @Test
      public void testCrossReduce() {
          for (int limit : new int[] { 1, 2, 4, 9 }) {
              List<List<Integer>> input = Collections.nCopies(3, IntStreamEx.range(limit).boxed().toList());
              List<String> expected = IntStreamEx.range(limit * limit * limit).mapToObj(
                  i -> "" + (i / limit / limit) + (i / limit % limit) + (i % limit)).toList();
              checkSpliterator("cross", expected, () -> new CrossSpliterator.Reducing<>(input, "", (s, b) -> s + b));
          }
      }
  
      @Test
      public void testBigSize() {
          List<List<Integer>> input = new ArrayList<>();
          input.add(IntStreamEx.rangeClosed(1, 20).boxed().toList());
          input.addAll(Collections.nCopies(18, IntStreamEx.rangeClosed(1, 10).boxed().toList()));
          Spliterator<List<Integer>> spltr = new CrossSpliterator.ToList<>(input);
          assertFalse(spltr.hasCharacteristics(Spliterator.SIZED));
          assertEquals(Long.MAX_VALUE, spltr.estimateSize());
          spltr.trySplit();
          assertFalse(spltr.hasCharacteristics(Spliterator.SIZED));
          assertEquals(Long.MAX_VALUE, spltr.estimateSize());
          spltr.trySplit();
          assertTrue(spltr.hasCharacteristics(Spliterator.SIZED));
          assertEquals(5_000_000_000_000_000_000L, spltr.estimateSize());
      }
  }
  