content: // Protocol Buffers - Google's data interchange format
  // Copyright 2008 Google Inc.  All rights reserved.
  // https://developers.google.com/protocol-buffers/
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  // notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  // copyright notice, this list of conditions and the following disclaimer
  // in the documentation and/or other materials provided with the
  // distribution.
  //     * Neither the name of Google Inc. nor the names of its
  // contributors may be used to endorse or promote products derived from
  // this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  package com.google.protobuf;
  
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.util.Arrays;
  import java.util.Random;
  import junit.framework.TestCase;
  
  /** Tests for {@link ByteBufferWriter}. */
  public class ByteBufferWriterTest extends TestCase {
  
    public void testHeapBuffer() throws IOException {
      // Test a small and large buffer.
      testWrite(ByteBuffer.allocate(100));
      testWrite(ByteBuffer.allocate(1024 * 100));
    }
  
    public void testDirectBuffer() throws IOException {
      // Test a small and large buffer.
      testWrite(ByteBuffer.allocateDirect(100));
      testWrite(ByteBuffer.allocateDirect(1024 * 100));
    }
  
    private void testWrite(ByteBuffer buffer) throws IOException {
      fillRandom(buffer);
      ByteArrayOutputStream os = new ByteArrayOutputStream(buffer.remaining());
      ByteBufferWriter.write(buffer, os);
      assertEquals(0, buffer.position());
      assertTrue(Arrays.equals(toArray(buffer), os.toByteArray()));
    }
  
    private void fillRandom(ByteBuffer buf) {
      byte[] bytes = new byte[buf.remaining()];
      new Random().nextBytes(bytes);
      buf.put(bytes);
      buf.flip();
      return;
    }
  
    private byte[] toArray(ByteBuffer buf) {
      int originalPosition = buf.position();
      byte[] bytes = new byte[buf.remaining()];
      buf.get(bytes);
      buf.position(originalPosition);
      return bytes;
    }
  }
  