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.client.utils;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.util.Collections;
  import java.util.List;
  import java.util.NoSuchElementException;
  import org.apache.arrow.flight.Location;
  import org.junit.jupiter.api.Test;
  
  class FlightLocationQueueTest {
    @Test
    void basicOperation() {
      Location location1 = Location.forGrpcInsecure("localhost", 8080);
      Location location2 = Location.forGrpcInsecure("localhost", 8081);
      FlightLocationQueue queue = new FlightLocationQueue(null, List.of(location1, location2));
      assertTrue(queue.hasNext());
      assertEquals(location1, queue.next());
      assertTrue(queue.hasNext());
      assertEquals(location2, queue.next());
      assertFalse(queue.hasNext());
    }
  
    @Test
    void badAfterGood() {
      Location location1 = Location.forGrpcInsecure("localhost", 8080);
      Location location2 = Location.forGrpcInsecure("localhost", 8081);
      FlightClientCache cache = new FlightClientCache();
      cache.markLocationAsDud(location1.toString());
      FlightLocationQueue queue = new FlightLocationQueue(cache, List.of(location1, location2));
      assertTrue(queue.hasNext());
      assertEquals(location2, queue.next());
      assertTrue(queue.hasNext());
      assertEquals(location1, queue.next());
      assertFalse(queue.hasNext());
    }
  
    @Test
    void iteratorInvariants() {
      FlightLocationQueue empty = new FlightLocationQueue(null, Collections.emptyList());
      assertFalse(empty.hasNext());
      assertThrows(NoSuchElementException.class, empty::next);
    }
  }
  