public void testFilterCreation() { ValidatorFilter filter = new ValidatorFilter(); HttpServletRequest request = getMockRequest(); MockHttpServletResponse response = new MockHttpServletResponse(); FilterConfig filterConfig = new MockFilterConfig(request.getSession().getServletContext(), "hdivFilter"); FilterChain filterChain = new MockFilterChain(); try { filter.init(filterConfig); filter.doFilter(request, response, filterChain); // Validation error because is not start page String redirectUrl = response.getRedirectedUrl(); assertEquals(getConfig().getErrorPage(), redirectUrl); } catch (ServletException e) { e.printStackTrace(); assertTrue(false); } catch (IOException e) { e.printStackTrace(); assertTrue(false); } }