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    * 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
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  package org.apache.hc.core5.http.impl;
  
  import org.apache.hc.core5.http.ConnectionReuseStrategy;
  import org.apache.hc.core5.http.HttpRequest;
  import org.apache.hc.core5.http.HttpResponse;
  import org.apache.hc.core5.http.HttpStatus;
  import org.apache.hc.core5.http.HttpVersion;
  import org.apache.hc.core5.http.Method;
  import org.apache.hc.core5.http.message.BasicHttpRequest;
  import org.apache.hc.core5.http.message.BasicHttpResponse;
  import org.apache.hc.core5.http.protocol.BasicHttpContext;
  import org.apache.hc.core5.http.protocol.HttpContext;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  public class TestDefaultConnectionReuseStrategy {
  
      /** HTTP context. */
      private HttpContext context;
  
      /** The reuse strategy to be tested. */
      private ConnectionReuseStrategy reuseStrategy;
  
      @BeforeEach
      public void setUp() {
          reuseStrategy = DefaultConnectionReuseStrategy.INSTANCE;
          context = new BasicHttpContext(null);
      }
  
      @Test
      public void testInvalidResponseArg() throws Exception {
          Assertions.assertThrows(NullPointerException.class, () ->
                  reuseStrategy.keepAlive(null, null, this.context));
      }
  
      @Test
      public void testNoContentLengthResponseHttp1_0() throws Exception {
          context.setProtocolVersion(HttpVersion.HTTP_1_0);
          final HttpResponse response = new BasicHttpResponse(200, "OK");
          Assertions.assertFalse(reuseStrategy.keepAlive(null, response, context));
      }
  
      @Test
      public void testNoContentLengthResponseHttp1_1() throws Exception {
          final HttpResponse response = new BasicHttpResponse(200, "OK");
          Assertions.assertFalse(reuseStrategy.keepAlive(null, response, context));
      }
  
      @Test
      public void testChunkedContent() throws Exception {
          final HttpResponse response = new BasicHttpResponse(200, "OK");
          response.addHeader("Transfer-Encoding", "chunked");
          Assertions.assertTrue(reuseStrategy.keepAlive(null, response, context));
      }
  
      @Test
      public void testIgnoreInvalidKeepAlive() throws Exception {
          context.setProtocolVersion(HttpVersion.HTTP_1_0);
          final HttpResponse response = new BasicHttpResponse(200, "OK");
          response.addHeader("Connection", "keep-alive");
          Assertions.assertFalse(reuseStrategy.keepAlive(null, response, context));
      }
  
      @Test
      public void testExplicitClose() throws Exception {
          // Use HTTP 1.1
          final HttpResponse response = new BasicHttpResponse(200, "OK");
          response.addHeader("Transfer-Encoding", "chunked");
          response.addHeader("Connection", "close");
          Assertions.assertFalse(reuseStrategy.keepAlive(null, response, context));
      }
 
     @Test
     public void testExplicitKeepAlive() throws Exception {
         // Use HTTP 1.0
         final HttpResponse response = new BasicHttpResponse(200, "OK");
         response.setVersion(HttpVersion.HTTP_1_0);
         response.addHeader("Content-Length", "10");
         response.addHeader("Connection", "keep-alive");
 
         Assertions.assertTrue(reuseStrategy.keepAlive(null, response, context));
     }
 
     @Test
     public void testHTTP10Default() throws Exception {
         final HttpResponse response = new BasicHttpResponse(200, "OK");
         response.setVersion(HttpVersion.HTTP_1_0);
         response.addHeader("Content-Length", "10");
         Assertions.assertFalse(reuseStrategy.keepAlive(null, response, context));
     }
 
     @Test
     public void testHTTP11Default() throws Exception {
         final HttpResponse response = new BasicHttpResponse(200, "OK");
         response.addHeader("Content-Length", "10");
         Assertions.assertTrue(reuseStrategy.keepAlive(null, response, context));
     }
 
     @Test
     public void testBrokenConnectionDirective1() throws Exception {
         // Use HTTP 1.0
         final HttpResponse response = new BasicHttpResponse(200, "OK");
         response.setVersion(HttpVersion.HTTP_1_0);
         response.addHeader("Content-Length", "10");
         response.addHeader("Connection", "keep--alive");
         Assertions.assertFalse(reuseStrategy.keepAlive(null, response, context));
     }
 
     @Test
     public void testBrokenConnectionDirective2() throws Exception {
         // Use HTTP 1.0
         final HttpResponse response = new BasicHttpResponse(200, "OK");
         response.setVersion(HttpVersion.HTTP_1_0);
         response.addHeader("Content-Length", "10");
         response.addHeader("Connection", null);
         Assertions.assertFalse(reuseStrategy.keepAlive(null, response, context));
     }
 
     @Test
     public void testConnectionTokens1() throws Exception {
         // Use HTTP 1.1
         final HttpResponse response = new BasicHttpResponse(200, "OK");
         response.addHeader("Transfer-Encoding", "chunked");
         response.addHeader("Connection", "yadda, cLOSe, dumdy");
         Assertions.assertFalse(reuseStrategy.keepAlive(null, response, context));
     }
 
     @Test
     public void testConnectionTokens2() throws Exception {
         // Use HTTP 1.1
         final HttpResponse response = new BasicHttpResponse(200, "OK");
         response.addHeader("Transfer-Encoding", "chunked");
         response.addHeader("Connection", "yadda, kEEP-alive, dumdy");
         Assertions.assertTrue(reuseStrategy.keepAlive(null, response, context));
     }
 
     @Test
     public void testConnectionTokens3() throws Exception {
         // Use HTTP 1.1
         final HttpResponse response = new BasicHttpResponse(200, "OK");
         response.addHeader("Transfer-Encoding", "chunked");
         response.addHeader("Connection", "yadda, keep-alive, close, dumdy");
         Assertions.assertFalse(reuseStrategy.keepAlive(null, response, context));
     }
 
     @Test
     public void testConnectionTokens4() throws Exception {
         // Use HTTP 1.1
         final HttpResponse response = new BasicHttpResponse(200, "OK");
         response.addHeader("Transfer-Encoding", "chunked");
         response.addHeader("Connection", "yadda, close, dumdy");
         response.addHeader("Proxy-Connection", "keep-alive");
         // Connection takes precedence over Proxy-Connection
         Assertions.assertFalse(reuseStrategy.keepAlive(null, response, context));
     }
 
     @Test
     public void testConnectionTokens5() throws Exception {
         // Use HTTP 1.1
         final HttpResponse response = new BasicHttpResponse(200, "OK");
         response.addHeader("Transfer-Encoding", "chunked");
         response.addHeader("Connection", "yadda, dumdy");
         response.addHeader("Proxy-Connection", "close");
         // Connection takes precedence over Proxy-Connection,
         // even if it doesn't contain a recognized token.
         // Default for HTTP/1.1 is to keep alive.
         Assertions.assertTrue(reuseStrategy.keepAlive(null, response, context));
     }
 
     @Test
     public void testConnectionTokens6() throws Exception {
         // Use HTTP 1.1
         final HttpResponse response = new BasicHttpResponse(200, "OK");
         response.addHeader("Transfer-Encoding", "chunked");
         response.addHeader("Connection", "");
         response.addHeader("Proxy-Connection", "close");
         // Connection takes precedence over Proxy-Connection,
         // even if it is empty. Default for HTTP/1.1 is to keep alive.
         Assertions.assertTrue(reuseStrategy.keepAlive(null, response, context));
     }
 
     @Test
     public void testMultipleContentLength() throws Exception {
         // Use HTTP 1.1
         final HttpResponse response = new BasicHttpResponse(200, "OK");
         response.addHeader("Content-Length", "10");
         response.addHeader("Content-Length", "11");
         Assertions.assertFalse(reuseStrategy.keepAlive(null, response, context));
     }
 
     @Test
     public void testNoContentResponse() throws Exception {
         // Use HTTP 1.1
         final HttpResponse response = new BasicHttpResponse(HttpStatus.SC_NO_CONTENT, "No Content");
         Assertions.assertTrue(reuseStrategy.keepAlive(null, response, context));
     }
 
     @Test
     public void testNoContentResponseHttp10() throws Exception {
         // Use HTTP 1.0
         final HttpResponse response = new BasicHttpResponse(HttpStatus.SC_NO_CONTENT, "No Content");
         response.setVersion(HttpVersion.HTTP_1_0);
         Assertions.assertFalse(reuseStrategy.keepAlive(null, response, context));
     }
 
     @Test
     public void testRequestExplicitClose() throws Exception {
         final HttpRequest request = new BasicHttpRequest(Method.GET, "/");
         request.addHeader("Connection", "close");
 
         final HttpResponse response = new BasicHttpResponse(200, "OK");
         response.addHeader("Transfer-Encoding", "chunked");
         response.addHeader("Connection", "keep-alive");
         Assertions.assertFalse(reuseStrategy.keepAlive(request, response, context));
     }
 
     @Test
     public void testRequestNoExplicitClose() throws Exception {
         final HttpRequest request = new BasicHttpRequest(Method.GET, "/");
         request.addHeader("Connection", "blah, blah, blah");
 
         final HttpResponse response = new BasicHttpResponse(200, "OK");
         response.addHeader("Transfer-Encoding", "chunked");
         response.addHeader("Connection", "keep-alive");
         Assertions.assertTrue(reuseStrategy.keepAlive(request, response, context));
     }
 
     @Test
     public void testRequestExplicitCloseMultipleTokens() throws Exception {
         final HttpRequest request = new BasicHttpRequest(Method.GET, "/");
         request.addHeader("Connection", "blah, blah, blah");
         request.addHeader("Connection", "keep-alive");
         request.addHeader("Connection", "close");
 
         final HttpResponse response = new BasicHttpResponse(200, "OK");
         response.addHeader("Transfer-Encoding", "chunked");
         response.addHeader("Connection", "keep-alive");
         Assertions.assertFalse(reuseStrategy.keepAlive(request, response, context));
     }
 
     @Test
     public void testRequestClose() throws Exception {
         final HttpRequest request = new BasicHttpRequest(Method.GET, "/");
         request.addHeader("Connection", "close");
 
         final HttpResponse response = new BasicHttpResponse(200, "OK");
         response.addHeader("Content-Length", "10");
         response.addHeader("Connection", "keep-alive");
 
         Assertions.assertFalse(reuseStrategy.keepAlive(request, response, context));
     }
 
     @Test
     public void testHeadRequestWithout() throws Exception {
         final HttpRequest request = new BasicHttpRequest(Method.HEAD, "/");
         final HttpResponse response = new BasicHttpResponse(200, "OK");
 
         Assertions.assertTrue(reuseStrategy.keepAlive(request, response, context));
     }
 
     @Test
     public void testHttp204ContentLengthGreaterThanZero() throws Exception {
         final HttpResponse response = new BasicHttpResponse(204, "OK");
         response.addHeader("Content-Length", "10");
         response.addHeader("Connection", "keep-alive");
         Assertions.assertFalse(reuseStrategy.keepAlive(null, response, context));
     }
 
     @Test
     public void testHttp204ContentLengthEqualToZero() throws Exception {
         final HttpResponse response = new BasicHttpResponse(204, "OK");
         response.addHeader("Content-Length", "0");
         response.addHeader("Connection", "keep-alive");
         Assertions.assertTrue(reuseStrategy.keepAlive(null, response, context));
     }
 
     @Test
     public void testHttp204ChunkedContent() throws Exception {
         final HttpResponse response = new BasicHttpResponse(204, "OK");
         response.addHeader("Transfer-Encoding", "chunked");
         response.addHeader("Connection", "keep-alive");
         Assertions.assertFalse(reuseStrategy.keepAlive(null, response, context));
     }
 }