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;
  
  import java.util.OptionalInt;
  import java.util.Random;
  import java.util.function.IntFunction;
  
  /**
   * A Random instance that makes it easy to modify the behavior of certain methods for test purposes.
   */
  class MockableRandom extends Random {
  
      private IntFunction<OptionalInt> nextIntFunction = __ -> OptionalInt.empty();
  
      public MockableRandom(long seed) {
          super(seed);
      }
  
      public void mockNextInt(int expectedBound, int returnValue) {
          this.nextIntFunction = b -> {
              if (b == expectedBound)
                  return OptionalInt.of(returnValue);
              else
                  return OptionalInt.empty();
          };
      }
  
      public void mockNextInt(int returnValue) {
          this.nextIntFunction = __ -> OptionalInt.of(returnValue);
      }
  
      @Override
      public int nextInt(int bound) {
          return nextIntFunction.apply(bound).orElse(super.nextInt(bound));
      }
  }
  