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 org.apache.kafka.coordinator.group.modern;
  
  import org.junit.jupiter.api.Test;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  import java.util.Set;
  import java.util.stream.IntStream;
  
  import static org.junit.jupiter.api.Assertions.assertArrayEquals;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  public class UnionSetTest {
      @Test
      public void testSetsCannotBeNull() {
          assertThrows(NullPointerException.class, () -> new UnionSet<String>(Set.of(), null));
          assertThrows(NullPointerException.class, () -> new UnionSet<String>(null, Set.of()));
      }
  
      @Test
      public void testUnion() {
          UnionSet<Integer> union = new UnionSet<>(
              Set.of(1, 2, 3),
              Set.of(2, 3, 4, 5)
          );
  
          List<Integer> result = new ArrayList<>(union);
          result.sort(Integer::compareTo);
  
          assertEquals(List.of(1, 2, 3, 4, 5), result);
      }
  
      @Test
      public void testSize() {
          UnionSet<Integer> union = new UnionSet<>(
              Set.of(1, 2, 3),
              Set.of(2, 3, 4, 5)
          );
  
          assertEquals(5, union.size());
      }
  
      @Test
      public void testIsEmpty() {
          UnionSet<Integer> union = new UnionSet<>(
              Set.of(1, 2, 3),
              Set.of(2, 3, 4, 5)
          );
  
          assertFalse(union.isEmpty());
  
          union = new UnionSet<>(
              Set.of(1, 2, 3),
              Set.of()
          );
  
          assertFalse(union.isEmpty());
  
          union = new UnionSet<>(
              Set.of(),
              Set.of(2, 3, 4, 5)
          );
  
          assertFalse(union.isEmpty());
  
          union = new UnionSet<>(
              Set.of(),
              Set.of()
          );
          assertTrue(union.isEmpty());
      }
  
      @Test
      public void testContains() {
          UnionSet<Integer> union = new UnionSet<>(
              Set.of(1, 2, 3),
              Set.of(2, 3, 4, 5)
          );
  
          IntStream.range(1, 6).forEach(item -> assertTrue(union.contains(item)));
  
          assertFalse(union.contains(0));
          assertFalse(union.contains(6));
      }
  
      @Test
      public void testToArray() {
          UnionSet<Integer> union = new UnionSet<>(
              Set.of(1, 2, 3),
              Set.of(2, 3, 4, 5)
          );
  
          Object[] expected = {1, 2, 3, 4, 5};
          Object[] actual = union.toArray();
          Arrays.sort(actual);
          assertArrayEquals(expected, actual);
      }
  
      @Test
      public void testToArrayWithArrayParameter() {
          UnionSet<Integer> union = new UnionSet<>(
              Set.of(1, 2, 3),
              Set.of(2, 3, 4, 5)
          );
  
          Integer[] input = new Integer[5];
          Integer[] expected = {1, 2, 3, 4, 5};
          union.toArray(input);
          Arrays.sort(input);
          assertArrayEquals(expected, input);
      }
  
      @Test
      public void testEquals() {
          UnionSet<Integer> union = new UnionSet<>(
              Set.of(1, 2, 3),
              Set.of(2, 3, 4, 5)
          );
  
          assertEquals(Set.of(1, 2, 3, 4, 5), union);
      }
  }
  