### Question:
GZipResponseStream extends ServletOutputStream { @Override public void write(int b) throws IOException { this.gzipStream.write((byte) b); } GZipResponseStream();  GZipResponseStream(HttpServletResponse response); @Override void close(); @Override void flush(); @Override void write(int b); @Override void write(byte[] bytes); @Override void write(byte[] bytes, int offset, int length); void setBaos(ByteArrayOutputStream baos); void setGzipStream(GZIPOutputStream gzipStream); void setOutput(ServletOutputStream output); void setResponse(HttpServletResponse response);  }### Answer:
@Test public void writeできる() throws Exception { res.write("aaaa".getBytes()); }