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    * Licensed to the Apache Software Foundation (ASF) under one
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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.
   * ====================================================================
   *
   * 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 java.util.function.Consumer;
  
  import javax.net.ssl.SSLException;
  
  import org.apache.hc.client5.http.impl.async.MinimalHttpAsyncClient;
  import org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManagerBuilder;
  import org.apache.hc.client5.http.ssl.DefaultClientTlsStrategy;
  import org.apache.hc.core5.http.HttpHost;
  import org.apache.hc.core5.http.URIScheme;
  import org.apache.hc.core5.http.config.Http1Config;
  import org.apache.hc.core5.http.nio.AsyncClientEndpoint;
  import org.apache.hc.core5.http2.config.H2Config;
  import org.apache.hc.core5.ssl.SSLContexts;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  
  public class TestHttpAsyncMinimalTlsHandshake extends AbstractIntegrationTestBase {
  
      public TestHttpAsyncMinimalTlsHandshake() {
          super(URIScheme.HTTPS);
      }
  
      protected MinimalHttpAsyncClient startMinimalClient(
              final Consumer<PoolingAsyncClientConnectionManagerBuilder> connManagerCustomizer) throws Exception {
          return startMinimalClient(
                  Http1Config.DEFAULT,
                  H2Config.DEFAULT,
                  connManagerCustomizer);
      }
  
      @Test
      public void testSuccessfulTlsHandshake() throws Exception {
          startServer(Http1Config.DEFAULT, null, null);
          final HttpHost target = targetHost();
  
          final int maxConnNo = 2;
          final MinimalHttpAsyncClient client = startMinimalClient(builder -> builder
                          .setMaxConnPerRoute(maxConnNo)
                          .setMaxConnTotal(maxConnNo));
  
          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
      public void testTlsHandshakeFailure() throws Exception {
          startServer(Http1Config.DEFAULT, null, null);
          final HttpHost target = targetHost();
  
          final int maxConnNo = 2;
          final MinimalHttpAsyncClient client = startMinimalClient(builder -> builder
                  .setTlsStrategy(new DefaultClientTlsStrategy(SSLContexts.createDefault()))
                  .setMaxConnPerRoute(maxConnNo)
                  .setMaxConnTotal(maxConnNo));
  
          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());
          }
      }
  
  }