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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.
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   */
  package org.apache.mina.filter.buffer;
  
  import static org.junit.Assert.assertEquals;
  
  import org.apache.mina.core.buffer.IoBuffer;
  import org.apache.mina.core.filterchain.IoFilterAdapter;
  import org.apache.mina.core.session.DummySession;
  import org.apache.mina.core.session.IoSession;
  import org.apache.mina.core.write.WriteRequest;
  import org.apache.mina.filter.logging.LoggingFilter;
  import org.junit.Test;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Tests {@link BufferedWriteFilter}.
   *
   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
   * @since MINA 2.0.0-M2
   */
  public class BufferedWriteFilterTest {
      static final Logger LOGGER = LoggerFactory.getLogger(BufferedWriteFilterTest.class);
  
      @Test
      public void testNonExpandableBuffer() throws Exception {
          IoBuffer dest = IoBuffer.allocate(1);
          assertEquals(false, dest.isAutoExpand());
      }
  
      @Test
      public void testBasicBuffering() {
          DummySession sess = new DummySession();
          sess.getFilterChain().addFirst("peer", new IoFilterAdapter() {
  
              private int counter;
  
              @Override
              public void filterClose(NextFilter nextFilter, IoSession session) throws Exception {
                  if (LOGGER.isDebugEnabled()) {
                      LOGGER.debug("Filter closed !");
                  }
                  
                  assertEquals(3, counter);
              }
  
              @Override
              public void filterWrite(NextFilter nextFilter, IoSession session, WriteRequest writeRequest)
                      throws Exception {
                  if (LOGGER.isDebugEnabled()) {
                      LOGGER.debug("New buffered message written !");
                  }
                  
                  counter++;
                  try {
                      IoBuffer buf = (IoBuffer) writeRequest.getMessage();
                      if (counter == 3) {
                          assertEquals(1, buf.limit());
                          assertEquals(0, buf.get());
                      } else {
                          assertEquals(10, buf.limit());
                      }
                  } catch (Exception ex) {
                      throw new AssertionError("Wrong message type");
                  }
              }
  
          });
          sess.getFilterChain().addFirst("logger", new LoggingFilter());
          BufferedWriteFilter bFilter = new BufferedWriteFilter(10);
          sess.getFilterChain().addLast("buffer", bFilter);
  
          IoBuffer data = IoBuffer.allocate(1);
          for (byte i = 0; i < 20; i++) {
              data.put((byte) (0x30 + i));
              data.flip();
              sess.write(data);
              data.clear();
          }
  
          // Add one more byte to overflow the final buffer
         data.put((byte) 0);
         data.flip();
         sess.write(data);
 
         // Flush the final byte
         bFilter.flush(sess);
 
         sess.closeNow();
     }
 }