MockHttpServletResponse response = new MockHttpServletResponse();
ModelAndView model = controller.watchPolicy(request, response);
assertNull(model);
assertEquals(response.getStatusCode(), HttpServletResponse.SC_OK);
// Negative test watch
MockHttpServletResponse response = new MockHttpServletResponse();
ModelAndView model = controller.watchPolicy(request, response);
assertNull(model);
assertEquals(response.getStatusCode(), HttpServletResponse.SC_OK);
// Negative test watch