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.apache.kafka.raft.RaftMessage;
  
  import org.junit.jupiter.api.Test;
  import org.mockito.Mockito;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  class BlockingMessageQueueTest {
  
      @Test
      public void testOfferAndPoll() {
          BlockingMessageQueue queue = new BlockingMessageQueue();
          assertTrue(queue.isEmpty());
          assertNull(queue.poll(0));
  
          RaftMessage message1 = Mockito.mock(RaftMessage.class);
          queue.add(message1);
          assertFalse(queue.isEmpty());
          assertEquals(message1, queue.poll(0));
          assertTrue(queue.isEmpty());
  
          RaftMessage message2 = Mockito.mock(RaftMessage.class);
          RaftMessage message3 = Mockito.mock(RaftMessage.class);
          queue.add(message2);
          queue.add(message3);
          assertFalse(queue.isEmpty());
          assertEquals(message2, queue.poll(0));
          assertEquals(message3, queue.poll(0));
  
      }
  
      @Test
      public void testWakeupFromPoll() {
          BlockingMessageQueue queue = new BlockingMessageQueue();
          queue.wakeup();
          assertNull(queue.poll(Long.MAX_VALUE));
      }
  
  }