@Test
public void shouldReturnNoBookWhenNotFound() throws Exception {

	when(bookService.find(anyString())).thenReturn(Optional.empty());
	mockMvc.perform(get("/books.html").param("isbn", "123"))
					.andExpect(status().isOk())
					.andExpect(view().name("books/details"))
					.andExpect(model().attributeDoesNotExist("book"));
}