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 org.junit.jupiter.api.Test;
  
  import java.util.Iterator;
  
  import static org.assertj.core.api.Assertions.assertThat;
  
  class DeterministicSetTest
  {
      @Test
      public void removePrevious()
      {
          DeterministicSet<Integer> set = of(1, 2, 3);
          Iterator<Integer> it = set.iterator();
          assertThat(next(it)).isEqualTo(3);
          set.remove(3);
          assertThat(next(it)).isEqualTo(2);
          assertThat(next(it)).isEqualTo(1);
          assertThat(it).isExhausted();
      }
  
      @Test
      public void removeCurrent()
      {
          DeterministicSet<Integer> set = of(1, 2, 3);
          Iterator<Integer> it = set.iterator();
          assertThat(next(it)).isEqualTo(3);
          set.remove(2);
          assertThat(next(it)).isEqualTo(1);
          assertThat(it).isExhausted();
      }
  
      @Test
      public void removeNext()
      {
          DeterministicSet<Integer> set = of(1, 2, 3);
          Iterator<Integer> it = set.iterator();
          assertThat(next(it)).isEqualTo(3);
          set.remove(1);
          assertThat(next(it)).isEqualTo(2);
          assertThat(it).isExhausted();
      }
  
      @Test
      public void removeFirst()
      {
          DeterministicSet<Integer> set = of(1, 2, 3);
          Iterator<Integer> it = set.iterator();
          set.remove(3);
          assertThat(next(it)).isEqualTo(2);
          assertThat(next(it)).isEqualTo(1);
          assertThat(it).isExhausted();
      }
  
      private static <T> DeterministicSet<T> of(T... values)
      {
          DeterministicSet<T> set = new DeterministicSet<>();
          for (T t : values)
              set.add(t);
          return set;
      }
  
      private static <T> T next(Iterator<T> it)
      {
          assertThat(it).hasNext();
          return it.next();
      }
  }