/*
    * 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
    *
    *      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 org.apache.commons.io.function;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertSame;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import java.io.IOException;
  import java.nio.file.Path;
  import java.nio.file.Paths;
  import java.util.Arrays;
  import java.util.List;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link IOIterable}.
   */
  class IOIterableTest {
  
      private static class Fixture implements IOIterable<Path> {
  
          List<Path> list = Arrays.asList(Paths.get("a"), Paths.get("b"));
  
          @Override
          public IOIterator<Path> iterator() {
              return IOIterator.adapt(list);
          }
  
          @Override
          public Iterable<Path> unwrap() {
              return list;
          }
  
      }
  
      private IOIterable<Path> iterable;
      private Fixture fixture;
  
      @BeforeEach
      public void beforeEach() {
          fixture = new Fixture();
          iterable = fixture;
      }
  
      @Test
      void testAsIterable() throws IOException {
          final AtomicInteger ref = new AtomicInteger();
          iterable.asIterable().iterator().forEachRemaining(e -> ref.incrementAndGet());
          assertEquals(2, ref.get());
      }
  
      @Test
      void testForEach() throws IOException {
          final AtomicInteger ref = new AtomicInteger();
          assertThrows(NullPointerException.class, () -> iterable.forEach(null));
          iterable.forEach(e -> ref.incrementAndGet());
          assertEquals(2, ref.get());
      }
  
      @Test
      void testIterator() throws IOException {
          final AtomicInteger ref = new AtomicInteger();
          iterable.iterator().forEachRemaining(e -> ref.incrementAndGet());
          assertEquals(2, ref.get());
      }
  
      @Test
      void testSpliterator() {
          final AtomicInteger ref = new AtomicInteger();
          iterable.spliterator().forEachRemaining(e -> ref.incrementAndGet());
          assertEquals(2, ref.get());
      }
  
      @Test
      void testUnrwap() {
          assertSame(fixture.list, iterable.unwrap());
          assertSame(fixture.unwrap(), iterable.unwrap());
      }
  }