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    * "License"); you may not use this file except in compliance
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   *
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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 static org.hamcrest.MatcherAssert.assertThat;
  
  import java.util.LinkedList;
  import java.util.Queue;
  import java.util.Random;
  import java.util.concurrent.Future;
  import java.util.concurrent.TimeUnit;
  
  import org.apache.hc.client5.http.impl.async.MinimalHttpAsyncClient;
  import org.apache.hc.client5.http.protocol.HttpClientContext;
  import org.apache.hc.client5.testing.extension.async.ClientProtocolLevel;
  import org.apache.hc.client5.testing.extension.async.ServerProtocolLevel;
  import org.apache.hc.core5.http.ContentType;
  import org.apache.hc.core5.http.HttpHost;
  import org.apache.hc.core5.http.HttpResponse;
  import org.apache.hc.core5.http.Message;
  import org.apache.hc.core5.http.Method;
  import org.apache.hc.core5.http.URIScheme;
  import org.apache.hc.core5.http.nio.AsyncClientEndpoint;
  import org.apache.hc.core5.http.nio.entity.AsyncEntityProducers;
  import org.apache.hc.core5.http.nio.entity.BasicAsyncEntityConsumer;
  import org.apache.hc.core5.http.nio.support.BasicRequestProducer;
  import org.apache.hc.core5.http.nio.support.BasicResponseConsumer;
  import org.hamcrest.CoreMatchers;
  import org.junit.jupiter.api.Test;
  
  public abstract class TestHttp1AsyncMinimal extends AbstractHttpAsyncFundamentalsTest {
  
      public TestHttp1AsyncMinimal(final URIScheme scheme) {
          super(scheme, ClientProtocolLevel.MINIMAL, ServerProtocolLevel.STANDARD);
      }
  
      @Test
      public void testConcurrentPostRequestsSameEndpoint() throws Exception {
          configureServer(bootstrap -> bootstrap.register("/echo/*", AsyncEchoHandler::new));
          final HttpHost target = startServer();
  
          final MinimalHttpAsyncClient client = startClient().getImplementation();
  
          final byte[] b1 = new byte[1024];
          final Random rnd = new Random(System.currentTimeMillis());
          rnd.nextBytes(b1);
  
          final int reqCount = 20;
  
          final Future<AsyncClientEndpoint> endpointLease = client.lease(target, null);
          final AsyncClientEndpoint endpoint = endpointLease.get(5, TimeUnit.SECONDS);
          try {
              final Queue<Future<Message<HttpResponse, byte[]>>> queue = new LinkedList<>();
              for (int i = 0; i < reqCount; i++) {
                  final Future<Message<HttpResponse, byte[]>> future = endpoint.execute(
                          new BasicRequestProducer(Method.GET, target, "/echo/",
                                  AsyncEntityProducers.create(b1, ContentType.APPLICATION_OCTET_STREAM)),
                          new BasicResponseConsumer<>(new BasicAsyncEntityConsumer()), HttpClientContext.create(), null);
                  queue.add(future);
              }
              while (!queue.isEmpty()) {
                  final Future<Message<HttpResponse, byte[]>> future = queue.remove();
                  final Message<HttpResponse, byte[]> responseMessage = future.get();
                  assertThat(responseMessage, CoreMatchers.notNullValue());
                  final HttpResponse response = responseMessage.getHead();
                  assertThat(response.getCode(), CoreMatchers.equalTo(200));
                  final byte[] b2 = responseMessage.getBody();
                  assertThat(b1, CoreMatchers.equalTo(b2));
                  endpoint.releaseAndReuse();
              }
          } finally {
              endpoint.releaseAndDiscard();
          }
  
      }
 
 }