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.api;
  
  import one.util.streamex.IntStreamEx;
  import one.util.streamex.LongStreamEx;
  import one.util.streamex.StreamEx;
  import org.junit.FixMethodOrder;
  import org.junit.Test;
  import org.junit.runners.MethodSorters;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  import java.util.Spliterator;
  import java.util.concurrent.atomic.AtomicBoolean;
  import java.util.function.Function;
  import java.util.stream.Stream;
  
  import static org.junit.Assert.*;
  
  /**
   * @author Tagir Valeev
   */
  @FixMethodOrder(MethodSorters.NAME_ASCENDING)
  public class BaseStreamExTest {
      @Test
      public void testSpliterator() {
          Spliterator<Integer> spltr = Arrays.spliterator(new Integer[]{1, 2, 3});
          StreamEx<Integer> s = StreamEx.of(spltr);
          assertFalse(s.isParallel());
          assertSame(spltr, s.spliterator());
      }
  
      @Test(expected = IllegalStateException.class)
      public void testSpliteratorConsumed() {
          StreamEx<Integer> s = StreamEx.of(1, 2, 3);
          assertNotNull(s.spliterator());
          s.spliterator();
      }
  
      @Test(expected = IllegalStateException.class)
      public void testStreamConsumed() {
          StreamEx<Integer> s = StreamEx.of(1, 2, 3);
          assertNotNull(s.spliterator());
          s.count();
      }
  
      @Test
      public void testClose() {
          List<String> closeHandlers = new ArrayList<>();
          StreamEx<Integer> stream = StreamEx.of(Stream.of(1, 2, 3).onClose(() -> closeHandlers.add("Orig stream")))
              .onClose(() -> closeHandlers.add("StreamEx"))
              .map(x -> x * 2)
              .onClose(() -> closeHandlers.add("After map"))
              .pairMap(Integer::sum)
              .onClose(() -> closeHandlers.add("After pairMap"))
              .append(4)
              .onClose(() -> closeHandlers.add("After append"))
              .prepend(Stream.of(5).onClose(() -> closeHandlers.add("Prepended Stream")))
              .prepend(StreamEx.of(6).onClose(() -> closeHandlers.add("Prepended StreamEx")));
          assertEquals(Arrays.asList(6, 5, 6, 10, 4), stream.toList());
          assertTrue(closeHandlers.isEmpty());
          stream.close();
          assertEquals(Arrays.asList("Orig stream", "StreamEx", "After map", "After pairMap", "After append",
              "Prepended Stream", "Prepended StreamEx"), closeHandlers);
          closeHandlers.clear();
          stream.close();
          assertTrue(closeHandlers.isEmpty());
      }
  
      @Test
      public void testCloseException() {
          AtomicBoolean flag = new AtomicBoolean();
          Function<String, Runnable> ex = str -> () -> {
              throw new IllegalStateException(str);
          };
          StreamEx<Integer> stream = StreamEx.of(Stream.of(1, 2, 3).onClose(ex.apply("Orig stream")))
              .onClose(ex.apply("StreamEx"))
              .map(x -> x * 2)
              .onClose(() -> flag.set(true))
              .pairMap(Integer::sum)
              .onClose(ex.apply("After pairMap"))
              .append(4)
              .onClose(ex.apply("After append"))
              .prepend(Stream.of(5).onClose(ex.apply("Prepended Stream")))
              .prepend(StreamEx.of(6).onClose(ex.apply("Prepended StreamEx")));
          assertEquals(Arrays.asList(6, 5, 6, 10, 4), stream.toList());
          try {
              stream.close();
          } catch (IllegalStateException e) {
              assertEquals("Orig stream", e.getMessage());
              assertEquals(Arrays.asList("StreamEx", "After pairMap", "After append", "Prepended Stream",
                  "Prepended StreamEx"), StreamEx.of(e.getSuppressed()).map(IllegalStateException.class::cast).map(
                  Throwable::getMessage).toList());
              assertTrue(flag.get());
              return;
          }
          fail("No exception");
      }
  
      @Test
      public void testChain() {
          assertArrayEquals(new double[] { 2, 2, 6, 2, 6 },
              IntStreamEx.of(3, 4, 5).chain(IntStreamEx::boxed)
                  .chain(s -> s.flatMapToLong(LongStreamEx::range))
                  .chain(s -> s.filter(n -> n % 2 != 0).asDoubleStream())
                  .chain(s -> s.map(x -> x * 2)).toArray(), 0.0);
      }
  }
  