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    * 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,
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   * "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.
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   *
   * This software consists of voluntary contributions made by many
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  package org.apache.hc.client5.testing.sync;
  
  import org.apache.hc.client5.http.classic.methods.HttpGet;
  import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
  import org.apache.hc.client5.http.impl.io.BasicHttpClientConnectionManager;
  import org.apache.hc.client5.testing.classic.RandomHandler;
  import org.apache.hc.client5.testing.sync.extension.TestClientResources;
  import org.apache.hc.core5.http.HttpHost;
  import org.apache.hc.core5.http.URIScheme;
  import org.apache.hc.core5.http.io.entity.EntityUtils;
  import org.apache.hc.core5.testing.classic.ClassicTestServer;
  import org.apache.hc.core5.util.Timeout;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.extension.RegisterExtension;
  
  public class TestBasicConnectionManager {
  
      public static final Timeout TIMEOUT = Timeout.ofMinutes(1);
  
      @RegisterExtension
      private TestClientResources testResources = new TestClientResources(URIScheme.HTTP, TIMEOUT);
  
      @Test
      public void testBasics() throws Exception {
          final ClassicTestServer server = testResources.startServer(null, null, null);
          server.registerHandler("/random/*", new RandomHandler());
          final HttpHost target = testResources.targetHost();
  
          final CloseableHttpClient client = testResources.startClient(builder -> builder
                  .setConnectionManager(new BasicHttpClientConnectionManager())
          );
  
          final HttpGet get = new HttpGet("/random/1024");
          client.execute(target, get, response -> {
              Assertions.assertEquals(200, response.getCode());
              EntityUtils.consume(response.getEntity());
              return null;
          });
      }
  
      @Test
      public void testConnectionStillInUse() throws Exception {
          final ClassicTestServer server = testResources.startServer(null, null, null);
          server.registerHandler("/random/*", new RandomHandler());
          final HttpHost target = testResources.targetHost();
  
          final CloseableHttpClient client = testResources.startClient(builder -> builder
                  .setConnectionManager(new BasicHttpClientConnectionManager())
          );
  
          final HttpGet get1 = new HttpGet("/random/1024");
          client.executeOpen(target, get1, null);
          final HttpGet get2 = new HttpGet("/random/1024");
          Assertions.assertThrows(IllegalStateException.class, () ->
                  client.executeOpen(target, get2, null));
      }
  
  }