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.streams.processor.internals;
  
  import org.junit.jupiter.api.Test;
  
  import java.util.Collections;
  import java.util.Optional;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  public class RepartitionTopicConfigTest {
  
      @Test
      public void shouldThrowAnExceptionWhenSettingNumberOfPartitionsIfTheyAreEnforced() {
          final String name = "my-topic";
          final RepartitionTopicConfig repartitionTopicConfig = new RepartitionTopicConfig(name,
                                                                                           Collections.emptyMap(),
                                                                                           10,
                                                                                           true);
  
          final UnsupportedOperationException ex = assertThrows(
              UnsupportedOperationException.class,
              () -> repartitionTopicConfig.setNumberOfPartitions(2)
          );
  
          assertEquals(String.format("number of partitions are enforced on topic " +
                                     "%s and can't be altered.", name), ex.getMessage());
      }
  
      @Test
      public void shouldNotThrowAnExceptionWhenSettingNumberOfPartitionsIfTheyAreNotEnforced() {
          final String name = "my-topic";
          final RepartitionTopicConfig repartitionTopicConfig = new RepartitionTopicConfig(name,
                                                                                           Collections.emptyMap(),
                                                                                           10,
                                                                                           false);
  
          repartitionTopicConfig.setNumberOfPartitions(4);
  
          assertEquals(repartitionTopicConfig.numberOfPartitions(), Optional.of(4));
      }
  }