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.arrow.driver.jdbc.utils;
  
  import static org.hamcrest.CoreMatchers.is;
  import static org.hamcrest.CoreMatchers.nullValue;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
  import static org.mockito.Mockito.mock;
  
  import java.util.concurrent.CompletionService;
  import org.apache.arrow.driver.jdbc.client.CloseableEndpointStreamPair;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.extension.ExtendWith;
  import org.mockito.Mock;
  import org.mockito.junit.jupiter.MockitoExtension;
  
  /** Tests for {@link FlightEndpointDataQueue}. */
  @ExtendWith(MockitoExtension.class)
  public class FlightEndpointDataQueueTest {
  
    @Mock private CompletionService<CloseableEndpointStreamPair> mockedService;
    private FlightEndpointDataQueue queue;
  
    @BeforeEach
    public void setUp() {
      queue = new FlightEndpointDataQueue(mockedService);
    }
  
    @Test
    public void testNextShouldRetrieveNullIfEmpty() throws Exception {
      assertThat(queue.next(), is(nullValue()));
    }
  
    @Test
    public void testNextShouldThrowExceptionUponClose() throws Exception {
      queue.close();
      ThrowableAssertionUtils.simpleAssertThrowableClass(
          IllegalStateException.class, () -> queue.next());
    }
  
    @Test
    public void testEnqueueShouldThrowExceptionUponClose() throws Exception {
      queue.close();
      ThrowableAssertionUtils.simpleAssertThrowableClass(
          IllegalStateException.class, () -> queue.enqueue(mock(CloseableEndpointStreamPair.class)));
    }
  
    @Test
    public void testCheckOpen() throws Exception {
      assertDoesNotThrow(
          () -> {
            queue.checkOpen();
            return true;
          });
      queue.close();
      ThrowableAssertionUtils.simpleAssertThrowableClass(
          IllegalStateException.class, () -> queue.checkOpen());
    }
  
    @Test
    public void testShouldCloseQueue() throws Exception {
      assertThat(queue.isClosed(), is(false));
      queue.close();
      assertThat(queue.isClosed(), is(true));
    }
  }
  