code: @Test public void statusCode() throws Exception {
    this.chain=new MockFilterChain(){
      @Override public void doFilter(    ServletRequest request,    ServletResponse response) throws IOException, ServletException {
        assertThat(((HttpServletResponse)response).getStatus(),equalTo(200));
        super.doFilter(request,response);
      }
    }
  ;
    this.filter.doFilter(this.request,this.response,this.chain);
    assertThat(((HttpServletResponseWrapper)this.chain.getResponse()).getStatus(),equalTo(200));
  }
  