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.timeline;
  
  import org.apache.kafka.common.utils.LogContext;
  
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.Timeout;
  
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertNotEquals;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  @Timeout(value = 40)
  public class TimelineHashMapTest {
  
      @Test
      public void testEmptyMap() {
          SnapshotRegistry registry = new SnapshotRegistry(new LogContext());
          TimelineHashMap<Integer, String> map = new TimelineHashMap<>(registry, 1);
          assertTrue(map.isEmpty());
          assertEquals(0, map.size());
          map.clear();
          assertTrue(map.isEmpty());
      }
  
      @Test
      public void testNullsForbidden() {
          SnapshotRegistry registry = new SnapshotRegistry(new LogContext());
          TimelineHashMap<String, Boolean> map = new TimelineHashMap<>(registry, 1);
          assertThrows(NullPointerException.class, () -> map.put(null, true));
          assertThrows(NullPointerException.class, () -> map.put("abc", null));
          assertThrows(NullPointerException.class, () -> map.put(null, null));
      }
  
      @Test
      public void testIteration() {
          SnapshotRegistry registry = new SnapshotRegistry(new LogContext());
          TimelineHashMap<Integer, String> map = new TimelineHashMap<>(registry, 1);
          map.put(123, "abc");
          map.put(456, "def");
          assertTrue(iteratorToList(map.keySet().iterator()).containsAll(List.of(123, 456)));
          assertTrue(iteratorToList(map.values().iterator()).containsAll(List.of("abc", "def")));
          assertTrue(map.containsValue("abc"));
          assertTrue(map.containsKey(456));
          assertFalse(map.isEmpty());
          registry.getOrCreateSnapshot(2);
          Iterator<Map.Entry<Integer, String>> iter = map.entrySet(2).iterator();
          map.clear();
          List<String> snapshotValues = new ArrayList<>();
          snapshotValues.add(iter.next().getValue());
          snapshotValues.add(iter.next().getValue());
          assertFalse(iter.hasNext());
          assertTrue(snapshotValues.containsAll(List.of("abc", "def")));
          assertFalse(map.isEmpty(2));
          assertTrue(map.isEmpty());
      }
  
      static <T> List<T> iteratorToList(Iterator<T> iter) {
          List<T> list = new ArrayList<>();
          while (iter.hasNext()) {
              list.add(iter.next());
          }
          return list;
      }
  
      @Test
      public void testMapMethods() {
          SnapshotRegistry registry = new SnapshotRegistry(new LogContext());
          TimelineHashMap<Integer, String> map = new TimelineHashMap<>(registry, 1);
          assertNull(map.putIfAbsent(1, "xyz"));
          assertEquals("xyz", map.putIfAbsent(1, "123"));
          assertEquals("xyz", map.putIfAbsent(1, "ghi"));
          map.putAll(Map.of(2, "b"));
          assertTrue(map.containsKey(2));
          assertEquals("xyz", map.remove(1));
          assertEquals("b", map.remove(2));
      }
  
      @Test
      public void testMapEquals() {
          SnapshotRegistry registry = new SnapshotRegistry(new LogContext());
          TimelineHashMap<Integer, String> map1 = new TimelineHashMap<>(registry, 1);
          assertNull(map1.putIfAbsent(1, "xyz"));
          assertNull(map1.putIfAbsent(2, "abc"));
          TimelineHashMap<Integer, String> map2 = new TimelineHashMap<>(registry, 1);
          assertNull(map2.putIfAbsent(1, "xyz"));
          assertNotEquals(map1, map2);
          assertNull(map2.putIfAbsent(2, "abc"));
          assertEquals(map1, map2);
      }
  }
  