SpringBoot/OpenAPI - Web layer testing with api-first approach

I'm trying to find out correct approach of testing openAPI specification that is written first and used to generate apis + models.

I found several solutions (workarounds) and would like to hear qualified opinions on that + maybe something else.

1. WebTestMvc annotation + Import for the handler that implements Delegate interface (without import I get 501 as it fallbacks to default openAPI impl)

    @WebMvcTest(OrderApiController.class)
    @Import(OrderHandler.class)
    class OrderHandlerTest {
   
        @Autowired
        private MockMvc mockMvc;
        @Test
        void createOrder() throws Exception {
            mockMvc.perform(post("/orders")
                    .contentType(MediaType.APPLICATION_JSON)
                    .content("{}"))
                    .andExpect(status().isOk());
        }
   

2. Exclude controllers from openAPI generation, disable delegates and just implement Api interface with own controller - not sure this is good approach as this way we are losing information about basePath in openApi spec.