// have just as simply NOT
// set any content on the servletRequest object to simulate consumption
// of the request message body.
// In the interest of brevity, however, let's do it the right way.
Filter servletFilter = new MyServletFilter();
servletFilter.doFilter(servletRequest, null, null);
MockHttpServletResponse servletResponse = invoke(servletRequest);
assertEquals("single_two_response", servletResponse.getContentAsString());
}