Mock MVC method andEXPECT i used this ,but how do make sure it returns what i want?

I want to remove the book that I have set in my test method. how can I put make the method and-EXPECT to understand I want to remove the book I set

@Test
    public void bookRemoveTest() throws Exception {
       securityService.autologin("admin", "admin");

        Book book = new Book();
        book.setId(1L);
        bookService.findOne(1L);

        expect(bookService.findOne(anyLong())).andReturn(book);
        replay(bookService);
        MvcResult result = mockMvc
                .perform(post("/book/remove")
                        .accept(MediaType.TEXT_HTML)
                        .contentType(MediaType.TEXT_HTML))
                .andExpect(status().isOk())
                .andReturn();
        String controllerResult = result.getResponse().getContentAsString();
     }

For further understanding this is the test controller

@RequestMapping(value="/remove", method=RequestMethod.POST)
    public String remove(
            @ModelAttribute("id") String id, Model model
    ) {
        bookService.removeOne(Long.parseLong(id.substring(8)));
        List<Book> bookList = bookService.findAll();
        model.addAttribute("bookList", bookList);

        return "redirect:/book/bookList";
    }