@Test
  public void receiveWriter() throws Exception {
    handler = new RequestHandler() {

      @Override
      public void handle(Request request, HttpServletResponse response) {
        response.setStatus(HTTP_OK);
        try {
          response.getWriter().print("content");
        } catch (IOException e) {
          fail();
        }
      }
    };
    StringWriter writer = new StringWriter();
    assertTrue(post(url).receive(writer).ok());
    assertEquals("content", writer.toString());
  }
Verify response in {@link Writer}

@throws Exception
lib/src/test/java/com/github/kevinsawicki/http/HttpRequestTest.java