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.server.immutable.pcollections;
  
  import org.apache.kafka.server.immutable.DelegationChecker;
  import org.apache.kafka.server.immutable.ImmutableSet;
  
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.params.ParameterizedTest;
  import org.junit.jupiter.params.provider.ValueSource;
  import org.pcollections.HashTreePSet;
  import org.pcollections.MapPSet;
  
  import java.util.Iterator;
  import java.util.List;
  import java.util.Spliterator;
  import java.util.function.Consumer;
  import java.util.function.Predicate;
  import java.util.stream.Stream;
  
  import static java.util.function.Function.identity;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotEquals;
  import static org.junit.jupiter.api.Assertions.assertSame;
  import static org.mockito.ArgumentMatchers.eq;
  import static org.mockito.Mockito.mock;
  
  @SuppressWarnings({"unchecked", "deprecation"})
  public class PCollectionsImmutableSetTest {
  
      private static final MapPSet<Object> SINGLETON_SET = HashTreePSet.singleton(new Object());
  
      private static final class PCollectionsHashSetWrapperDelegationChecker<R> extends DelegationChecker<MapPSet<Object>, PCollectionsImmutableSet<Object>, R> {
          public PCollectionsHashSetWrapperDelegationChecker() {
              super(mock(MapPSet.class), PCollectionsImmutableSet::new);
          }
  
          public MapPSet<Object> unwrap(PCollectionsImmutableSet<Object> wrapper) {
              return wrapper.underlying();
          }
      }
  
      @Test
      public void testEmptySet() {
          Assertions.assertEquals(HashTreePSet.empty(), ((PCollectionsImmutableSet<?>) ImmutableSet.empty()).underlying());
      }
  
      @Test
      public void testSingletonSet() {
          Assertions.assertEquals(HashTreePSet.singleton(1), ((PCollectionsImmutableSet<?>) ImmutableSet.singleton(1)).underlying());
      }
  
      @Test
      public void testUnderlying() {
          assertSame(SINGLETON_SET, new PCollectionsImmutableSet<>(SINGLETON_SET).underlying());
      }
  
      @Test
      public void testDelegationOfAdded() {
          new PCollectionsHashSetWrapperDelegationChecker<>()
              .defineMockConfigurationForFunctionInvocation(mock -> mock.plus(eq(this)), SINGLETON_SET)
              .defineWrapperFunctionInvocationAndMockReturnValueTransformation(wrapper -> wrapper.added(this), identity())
              .expectWrapperToWrapMockFunctionReturnValue()
              .doFunctionDelegationCheck();
      }
  
      @Test
      public void testDelegationOfRemoved() {
          new PCollectionsHashSetWrapperDelegationChecker<>()
              .defineMockConfigurationForFunctionInvocation(mock -> mock.minus(eq(this)), SINGLETON_SET)
              .defineWrapperFunctionInvocationAndMockReturnValueTransformation(wrapper -> wrapper.removed(this), identity())
              .expectWrapperToWrapMockFunctionReturnValue()
              .doFunctionDelegationCheck();
      }
  
      @ParameterizedTest
      @ValueSource(ints = {1, 2})
      public void testDelegationOfSize(int mockFunctionReturnValue) {
          new PCollectionsHashSetWrapperDelegationChecker<>()
              .defineMockConfigurationForFunctionInvocation(MapPSet::size, mockFunctionReturnValue)
              .defineWrapperFunctionInvocationAndMockReturnValueTransformation(PCollectionsImmutableSet::size, identity())
              .doFunctionDelegationCheck();
      }
  
      @ParameterizedTest
      @ValueSource(booleans = {true, false})
      public void testDelegationOfIsEmpty(boolean mockFunctionReturnValue) {
          new PCollectionsHashSetWrapperDelegationChecker<>()
              .defineMockConfigurationForFunctionInvocation(MapPSet::isEmpty, mockFunctionReturnValue)
              .defineWrapperFunctionInvocationAndMockReturnValueTransformation(PCollectionsImmutableSet::isEmpty, identity())
              .doFunctionDelegationCheck();
      }
  
      @ParameterizedTest
      @ValueSource(booleans = {true, false})
      public void testDelegationOfContains(boolean mockFunctionReturnValue) {
          new PCollectionsHashSetWrapperDelegationChecker<>()
              .defineMockConfigurationForFunctionInvocation(mock -> mock.contains(eq(this)), mockFunctionReturnValue)
              .defineWrapperFunctionInvocationAndMockReturnValueTransformation(wrapper -> wrapper.contains(this), identity())
              .doFunctionDelegationCheck();
      }
  
      @Test
      public void testDelegationOfIterator() {
          new PCollectionsHashSetWrapperDelegationChecker<>()
              .defineMockConfigurationForFunctionInvocation(MapPSet::iterator, mock(Iterator.class))
              .defineWrapperFunctionInvocationAndMockReturnValueTransformation(PCollectionsImmutableSet::iterator, identity())
              .doFunctionDelegationCheck();
      }
  
      @Test
      public void testDelegationOfForEach() {
          final Consumer<Object> mockConsumer = mock(Consumer.class);
          new PCollectionsHashSetWrapperDelegationChecker<>()
              .defineMockConfigurationForVoidMethodInvocation(mock -> mock.forEach(eq(mockConsumer)))
              .defineWrapperVoidMethodInvocation(wrapper -> wrapper.forEach(mockConsumer))
              .doVoidMethodDelegationCheck();
      }
  
      @Test
      public void testDelegationOfToArray() {
          new PCollectionsHashSetWrapperDelegationChecker<>()
              .defineMockConfigurationForFunctionInvocation(MapPSet::toArray, new Object[0])
              .defineWrapperFunctionInvocationAndMockReturnValueTransformation(PCollectionsImmutableSet::toArray, identity())
              .doFunctionDelegationCheck();
      }
  
      @Test
      public void testDelegationOfToArrayIntoGivenDestination() {
          Object[] destinationArray = new Object[0];
          new PCollectionsHashSetWrapperDelegationChecker<>()
              .defineMockConfigurationForFunctionInvocation(mock -> mock.toArray(eq(destinationArray)), new Object[0])
              .defineWrapperFunctionInvocationAndMockReturnValueTransformation(wrapper -> wrapper.toArray(destinationArray), identity())
              .doFunctionDelegationCheck();
      }
  
      @Test
      public void testDelegationOfUnsupportedFunctionAdd() {
          new PCollectionsHashSetWrapperDelegationChecker<>()
              .defineMockConfigurationForUnsupportedFunction(mock -> mock.add(eq(this)))
              .defineWrapperUnsupportedFunctionInvocation(wrapper -> wrapper.add(this))
              .doUnsupportedFunctionDelegationCheck();
      }
  
      @Test
      public void testDelegationOfUnsupportedFunctionRemove() {
          new PCollectionsHashSetWrapperDelegationChecker<>()
              .defineMockConfigurationForUnsupportedFunction(mock -> mock.remove(eq(this)))
              .defineWrapperUnsupportedFunctionInvocation(wrapper -> wrapper.remove(this))
              .doUnsupportedFunctionDelegationCheck();
      }
  
      @ParameterizedTest
      @ValueSource(booleans = {true, false})
      public void testDelegationOfContainsAll(boolean mockFunctionReturnValue) {
          new PCollectionsHashSetWrapperDelegationChecker<>()
              .defineMockConfigurationForFunctionInvocation(mock -> mock.containsAll(eq(List.of())), mockFunctionReturnValue)
              .defineWrapperFunctionInvocationAndMockReturnValueTransformation(wrapper -> wrapper.containsAll(List.of()), identity())
              .doFunctionDelegationCheck();
      }
  
      @Test
      public void testDelegationOfUnsupportedFunctionAddAll() {
          new PCollectionsHashSetWrapperDelegationChecker<>()
              .defineMockConfigurationForUnsupportedFunction(mock -> mock.addAll(eq(List.of())))
              .defineWrapperUnsupportedFunctionInvocation(wrapper -> wrapper.addAll(List.of()))
              .doUnsupportedFunctionDelegationCheck();
      }
  
      @Test
      public void testDelegationOfUnsupportedFunctionRetainAll() {
          new PCollectionsHashSetWrapperDelegationChecker<>()
              .defineMockConfigurationForUnsupportedFunction(mock -> mock.retainAll(eq(List.of())))
              .defineWrapperUnsupportedFunctionInvocation(wrapper -> wrapper.retainAll(List.of()))
              .doUnsupportedFunctionDelegationCheck();
      }
  
      @Test
      public void testDelegationOfUnsupportedFunctionRemoveAll() {
          new PCollectionsHashSetWrapperDelegationChecker<>()
              .defineMockConfigurationForUnsupportedFunction(mock -> mock.removeAll(eq(List.of())))
              .defineWrapperUnsupportedFunctionInvocation(wrapper -> wrapper.removeAll(List.of()))
              .doUnsupportedFunctionDelegationCheck();
      }
  
      @Test
      public void testDelegationOfUnsupportedFunctionRemoveIf() {
          final Predicate<Object> mockPredicate = mock(Predicate.class);
          new PCollectionsHashSetWrapperDelegationChecker<>()
              .defineMockConfigurationForUnsupportedFunction(mock -> mock.removeIf(eq(mockPredicate)))
              .defineWrapperUnsupportedFunctionInvocation(wrapper -> wrapper.removeIf(mockPredicate))
              .doUnsupportedFunctionDelegationCheck();
      }
  
      @Test
      public void testDelegationOfUnsupportedFunctionClear() {
          new PCollectionsHashSetWrapperDelegationChecker<>()
              .defineMockConfigurationForVoidMethodInvocation(MapPSet::clear)
              .defineWrapperVoidMethodInvocation(PCollectionsImmutableSet::clear)
              .doUnsupportedVoidFunctionDelegationCheck();
      }
  
      @Test
      public void testDelegationOfSpliterator() {
          new PCollectionsHashSetWrapperDelegationChecker<>()
              .defineMockConfigurationForFunctionInvocation(MapPSet::spliterator, mock(Spliterator.class))
              .defineWrapperFunctionInvocationAndMockReturnValueTransformation(PCollectionsImmutableSet::spliterator, identity())
              .doFunctionDelegationCheck();
      }
  
  
      @Test
      public void testDelegationOfStream() {
          new PCollectionsHashSetWrapperDelegationChecker<>()
              .defineMockConfigurationForFunctionInvocation(MapPSet::stream, mock(Stream.class))
              .defineWrapperFunctionInvocationAndMockReturnValueTransformation(PCollectionsImmutableSet::stream, identity())
              .doFunctionDelegationCheck();
      }
  
      @Test
      public void testDelegationOfParallelStream() {
          new PCollectionsHashSetWrapperDelegationChecker<>()
              .defineMockConfigurationForFunctionInvocation(MapPSet::parallelStream, mock(Stream.class))
              .defineWrapperFunctionInvocationAndMockReturnValueTransformation(PCollectionsImmutableSet::parallelStream, identity())
              .doFunctionDelegationCheck();
      }
  
      @Test
      public void testEquals() {
          final MapPSet<Object> mock = mock(MapPSet.class);
          assertEquals(new PCollectionsImmutableSet<>(mock), new PCollectionsImmutableSet<>(mock));
          final MapPSet<Object> someOtherMock = mock(MapPSet.class);
          assertNotEquals(new PCollectionsImmutableSet<>(mock), new PCollectionsImmutableSet<>(someOtherMock));
      }
  
      @Test
      public void testHashCode() {
          final MapPSet<Object> mock = mock(MapPSet.class);
          assertEquals(mock.hashCode(), new PCollectionsImmutableSet<>(mock).hashCode());
          final MapPSet<Object> someOtherMock = mock(MapPSet.class);
          assertNotEquals(mock.hashCode(), new PCollectionsImmutableSet<>(someOtherMock).hashCode());
      }
  
      @ParameterizedTest
      @ValueSource(strings = {"a", "b"})
      public void testDelegationOfToString(String mockFunctionReturnValue) {
          new PCollectionsHashSetWrapperDelegationChecker<>()
              .defineMockConfigurationForFunctionInvocation(MapPSet::toString, mockFunctionReturnValue)
              .defineWrapperFunctionInvocationAndMockReturnValueTransformation(PCollectionsImmutableSet::toString,
                  text -> "PCollectionsImmutableSet{underlying=" + text + "}")
              .doFunctionDelegationCheck();
      }
  }
  