HttpServletRequest request = createMock(HttpServletRequest.class);
HttpServletResponse response = createMock(HttpServletResponse.class);
FilterChain filterChain = createMock(FilterChain.class);
//meaning no dispatch could be performed...
expect(dispatcher.dispatch(request, response))
.andReturn(null);
filterChain.doFilter(request, response);
expectLastCall().once();