public String post(String url,String json,Map<String,String> headers,final int expectedStatusCode){
  return post(url,json,headers,Collections.<String,String>emptyMap(),expectedStatusCode);
}

public String post ( String url , String json , Map < String , String > headers , final int expectedStatusCode ) { return post ( url , json , headers , Collections . < String , String > emptyMap ( ) , expectedStatusCode ) ; }
issue an http post and assert the response status code .
