GZIPResponseWrapper test = new GZIPResponseWrapper(response);
test.setStatus(200);
verify(response).setStatus(200);
test.addHeader("header", "header value");
verify(response).addHeader("header", "header value");
test.addHeader("content-length", "header value2");
verify(response, never()).addHeader("content-length", "header value");
test.setIntHeader("header", 5);
verify(response).setIntHeader("header", 5);
test.setIntHeader("content-length", 4);