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.raft.internals;
  
  import org.junit.jupiter.api.Test;
  
  import java.util.Optional;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  public final class TreeMapLogHistoryTest {
      @Test
      void testEmpty() {
          TreeMapLogHistory<String> history = new TreeMapLogHistory<>();
          assertEquals(Optional.empty(), history.valueAtOrBefore(100));
          assertEquals(Optional.empty(), history.lastEntry());
      }
  
      @Test
      void testAddAt() {
          TreeMapLogHistory<String> history = new TreeMapLogHistory<>();
          assertThrows(IllegalArgumentException.class, () -> history.addAt(-2, ""));
          assertEquals(Optional.empty(), history.lastEntry());
  
          history.addAt(-1, "-1");
          assertEquals(Optional.of("-1"), history.valueAtOrBefore(-1));
          assertEquals(Optional.of("-1"), history.valueAtOrBefore(0));
          history.addAt(100, "100");
          assertThrows(IllegalArgumentException.class, () -> history.addAt(99, ""));
          assertThrows(IllegalArgumentException.class, () -> history.addAt(100, ""));
          assertEquals(Optional.of("100"), history.valueAtOrBefore(100));
          assertEquals(Optional.of("100"), history.valueAtOrBefore(201));
  
          history.addAt(200, "200");
          assertEquals(Optional.empty(), history.valueAtOrBefore(-2));
          assertEquals(Optional.of("-1"), history.valueAtOrBefore(-1));
          assertEquals(Optional.of("100"), history.valueAtOrBefore(100));
          assertEquals(Optional.of("100"), history.valueAtOrBefore(101));
          assertEquals(Optional.of("100"), history.valueAtOrBefore(199));
          assertEquals(Optional.of("200"), history.valueAtOrBefore(200));
          assertEquals(Optional.of("200"), history.valueAtOrBefore(201));
          assertEquals(Optional.of(new LogHistory.Entry<>(200, "200")), history.lastEntry());
      }
  
      @Test
      void testTruncateTo() {
          TreeMapLogHistory<String> history = new TreeMapLogHistory<>();
          history.addAt(100, "100");
          history.addAt(200, "200");
  
          history.truncateNewEntries(201);
          assertEquals(Optional.of(new LogHistory.Entry<>(200, "200")), history.lastEntry());
  
          history.truncateNewEntries(200);
          assertEquals(Optional.of(new LogHistory.Entry<>(100, "100")), history.lastEntry());
  
          history.truncateNewEntries(101);
          assertEquals(Optional.of(new LogHistory.Entry<>(100, "100")), history.lastEntry());
  
          history.truncateNewEntries(100);
          assertEquals(Optional.empty(), history.lastEntry());
      }
  
      @Test
      void testTrimPrefixTo() {
          TreeMapLogHistory<String> history = new TreeMapLogHistory<>();
          history.addAt(100, "100");
          history.addAt(200, "200");
  
          history.truncateOldEntries(99);
          assertEquals(Optional.empty(), history.valueAtOrBefore(99));
          assertEquals(Optional.of("100"), history.valueAtOrBefore(100));
  
          history.truncateOldEntries(100);
          assertEquals(Optional.empty(), history.valueAtOrBefore(99));
          assertEquals(Optional.of("100"), history.valueAtOrBefore(100));
  
          history.truncateOldEntries(101);
          assertEquals(Optional.empty(), history.valueAtOrBefore(99));
          assertEquals(Optional.of("100"), history.valueAtOrBefore(100));
  
          history.truncateOldEntries(200);
          assertEquals(Optional.empty(), history.valueAtOrBefore(199));
          assertEquals(Optional.of("200"), history.valueAtOrBefore(200));
      }
  
      @Test
      void testClear() {
          TreeMapLogHistory<String> history = new TreeMapLogHistory<>();
          history.addAt(100, "100");
          history.addAt(200, "200");
          history.clear();
          assertEquals(Optional.empty(), history.lastEntry());
      }
  }
  