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.common.utils;
  
  import org.junit.jupiter.api.Test;
  
  import java.util.Iterator;
  import java.util.Map;
  
  import static org.apache.kafka.common.utils.Utils.mkEntry;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  public class FixedOrderMapTest {
  
      @Test
      public void shouldMaintainOrderWhenAdding() {
          final FixedOrderMap<String, Integer> map = new FixedOrderMap<>();
          map.put("a", 0);
          map.put("b", 1);
          map.put("c", 2);
          map.put("b", 3);
          final Iterator<Map.Entry<String, Integer>> iterator = map.entrySet().iterator();
          assertEquals(mkEntry("a", 0), iterator.next());
          assertEquals(mkEntry("b", 3), iterator.next());
          assertEquals(mkEntry("c", 2), iterator.next());
          assertFalse(iterator.hasNext());
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldForbidRemove() {
          final FixedOrderMap<String, Integer> map = new FixedOrderMap<>();
          map.put("a", 0);
          assertThrows(UnsupportedOperationException.class, () -> map.remove("a"));
          assertEquals(0, map.get("a"));
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldForbidConditionalRemove() {
          final FixedOrderMap<String, Integer> map = new FixedOrderMap<>();
          map.put("a", 0);
          assertThrows(UnsupportedOperationException.class, () -> map.remove("a", 0));
          assertEquals(0, map.get("a"));
      }
  }
  