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    * 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
   *
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   *
   * Unless required by applicable law or agreed to in writing,
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   * 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.async;
  
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.Future;
  import java.util.concurrent.TimeUnit;
  
  import javax.net.ssl.SSLException;
  
  import org.apache.hc.client5.http.impl.async.MinimalHttpAsyncClient;
  import org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManager;
  import org.apache.hc.client5.http.ssl.DefaultClientTlsStrategy;
  import org.apache.hc.client5.testing.extension.async.ClientProtocolLevel;
  import org.apache.hc.client5.testing.extension.async.ServerProtocolLevel;
  import org.apache.hc.core5.http.HttpHost;
  import org.apache.hc.core5.http.URIScheme;
  import org.apache.hc.core5.http.nio.AsyncClientEndpoint;
  import org.apache.hc.core5.ssl.SSLContexts;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  
  class TestHttpAsyncMinimalTlsHandshake extends AbstractIntegrationTestBase {
  
      public TestHttpAsyncMinimalTlsHandshake() {
          super(URIScheme.HTTPS, ClientProtocolLevel.MINIMAL, ServerProtocolLevel.STANDARD);
      }
  
      @Test
      void testSuccessfulTlsHandshake() throws Exception {
          final HttpHost target = startServer();
  
          final int maxConnNo = 2;
          final PoolingAsyncClientConnectionManager connectionManager = startClient().getConnectionManager();
          connectionManager.setDefaultMaxPerRoute(maxConnNo);
          connectionManager.setMaxTotal(maxConnNo);
  
          final MinimalHttpAsyncClient client = startClient().getImplementation();
  
          for (int i = 0; i < maxConnNo + 1; i++) {
              final Future<AsyncClientEndpoint> endpointLease = client.lease(target, null);
              final AsyncClientEndpoint endpoint = endpointLease.get(5, TimeUnit.SECONDS);
              endpoint.releaseAndDiscard();
          }
      }
  
      @Test
      void testTlsHandshakeFailure() throws Exception {
          final HttpHost target = startServer();
  
          configureClient(builder ->
                  builder.setTlsStrategy(new DefaultClientTlsStrategy(SSLContexts.createDefault())));
  
          final int maxConnNo = 2;
          final PoolingAsyncClientConnectionManager connectionManager = startClient().getConnectionManager();
          connectionManager.setDefaultMaxPerRoute(maxConnNo);
          connectionManager.setMaxTotal(maxConnNo);
  
          final MinimalHttpAsyncClient client = startClient().getImplementation();
  
          for (int i = 0; i < maxConnNo + 1; i++) {
              final Future<AsyncClientEndpoint> endpointLease = client.lease(target, null);
              final ExecutionException executionException = Assertions.assertThrows(ExecutionException.class,
                      () -> endpointLease.get(5, TimeUnit.SECONDS));
              Assertions.assertInstanceOf(SSLException.class, executionException.getCause());
          }
      }
  
  }