MockHttpServletRequest originalRequest = new MockHttpServletRequest();
MockHttpServletResponse response = new MockHttpServletResponse();
originalRequest.setMethod("POST");
originalRequest.setContentType("multipart/form-data");
originalRequest.addHeader("Content-type", "multipart/form-data");
filter.doFilter(originalRequest, response, filterChain2);
CommonsMultipartFile file1 = (CommonsMultipartFile) files.get(0);
CommonsMultipartFile file2 = (CommonsMultipartFile) files.get(1);
assertTrue(((MockFileItem) file1.getFileItem()).deleted);
assertTrue(((MockFileItem) file2.getFileItem()).deleted);