/*
    * 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 org.apache.commons.collections4.iterators;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  import static org.junit.jupiter.api.Assertions.fail;
  
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  
  import org.apache.commons.collections4.BulkTest;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests for IteratorIterable.
   */
  public class IteratorIterableTest extends BulkTest {
  
      public IteratorIterableTest() {
          super(IteratorIterableTest.class.getSimpleName());
      }
  
      private Iterator<Integer> createIterator() {
          final List<Integer> list = new ArrayList<>();
          list.add(Integer.valueOf(0));
          list.add(Integer.valueOf(1));
          list.add(Integer.valueOf(2));
          final Iterator<Integer> iter = list.iterator();
          return iter;
      }
  
      @Test
      @SuppressWarnings("unused")
      public void testIterator() {
          final Iterator<Integer> iter = createIterator();
          final Iterable<Number> iterable = new IteratorIterable<>(iter);
  
          // first use
          verifyIteration(iterable);
  
          // second use
          for (final Number actual : iterable) {
              fail("should not be able to iterate twice");
          }
      }
  
      @Test
      public void testMultipleUserIterator() {
          final Iterator<Integer> iter = createIterator();
  
          final Iterable<Number> iterable = new IteratorIterable<>(iter, true);
  
          // first use
          verifyIteration(iterable);
  
          // second use
          verifyIteration(iterable);
      }
  
      private void verifyIteration(final Iterable<Number> iterable) {
          int expected = 0;
          for (final Number actual : iterable) {
              assertEquals(expected, actual.intValue());
              ++expected;
          }
          assertTrue(expected > 0);
      }
  }