code: @Test public void filterDumpsResponse(){
    MockHttpServletRequest request=new MockHttpServletRequest("GET","/foo");
    MockHttpServletResponse response=new MockHttpServletResponse();
    response.addHeader("Content-Type","application/json");
    Map<String,Object> trace=this.filter.getTrace(request);
    this.filter.enhanceTrace(trace,response);
    @SuppressWarnings("unchecked") Map<String,Object> map=(Map<String,Object>)trace.get("headers");
    assertEquals("{Content-Type=application/json, status=200}",map.get("response").toString());
  }
  