Verifying Custom Controller Advice Responses with MockMvc and JSON Path

@WebMvcTest(OrderController.class)
class OrderControllerTest {
    @Autowired
    private MockMvc mockMvc;
    @MockBean
    private OrderService orderService;
 
    @Test
    void shouldReturnNotFoundProblemDetails() throws Exception {
        Mockito.when(orderService.getOrder(404L))
               .thenThrow(new EntityNotFoundException("Order 404 not found"));
 
        mockMvc.perform(MockMvcRequestBuilders.get("/api/orders/404"))
               .andExpect(MockMvcResultMatchers.status().isNotFound())
               .andExpect(MockMvcResultMatchers.jsonPath("$.detail").value("Order 404 not found"));
    }
}