code: @Test public void testKnownLengthContentToByteArray() throws Exception {
    byte[] bytes="Message content".getBytes("ISO-8859-1");
    BasicHttpEntity httpentity=new BasicHttpEntity();
    httpentity.setContent(new ByteArrayInputStream(bytes));
    httpentity.setContentLength(bytes.length);
    byte[] bytes2=EntityUtils.toByteArray(httpentity);
    Assert.assertNotNull(bytes2);
    Assert.assertEquals(bytes.length,bytes2.length);
    for (int i=0; i < bytes.length; i++) {
      Assert.assertEquals(bytes[i],bytes2[i]);
    }
  }
  