code: @Test public void testBasics() throws IOException {
    String correct="1234567890123456";
    InputStream in=new ContentLengthInputStream(new SessionInputBufferMock(EncodingUtils.getBytes(correct,CONTENT_CHARSET)),10L);
    ByteArrayOutputStream out=new ByteArrayOutputStream();
    byte[] buffer=new byte[50];
    int len=in.read(buffer,0,2);
    out.write(buffer,0,len);
    len=in.read(buffer);
    out.write(buffer,0,len);
    String result=EncodingUtils.getString(out.toByteArray(),CONTENT_CHARSET);
    Assert.assertEquals(result,"1234567890");
  }
  