How to setServletPath() in Spring Junit WebTestClient?

@SpringBootTest(properties = "spring.mvc.servlet.path=/test/path")
@AutoConfigureMockMvc
public class MyTest {
   @Autowired
   private WebTestClient webTestClient

   @Test
   public void test() {
       webTestClient.post()
                .uri(URL)
                .bodyValue(json)
                .exchange()
                .expectStatus().isOk()
                .expectBody(String.class)
                .returnResult()
                .getResponseBody();
   }
}

@RestController
public class MyController {    
    @PostMapping
    public Object post(HttpServletRequest req) {
        System.out.println(req.getServletPath()); //always empty in tests
    }
}

This creates a MockHttpServletRequest that is send to the @RestContoller servlets.

Problem: my servlets make use of HttpServletRequest.getServletPath(), but which is always empty using the WebTestClient approach above.

Question: how can I explicit set the servletPath in my junit tests?

Answer

I could solve it as follows, but as this is really hacky, I’d still appreciate a proper solution.

@TestConfiguration
static class ServletPathMockConfiguration {
    @Bean
    public Filter filter() {
        return (request, response, filterchain) -> {
            Object req = request;
            while (req instanceof ServletRequestWrapper) {
                req = ((ServletRequestWrapper) req).getRequest();
            }
            
            if (req instanceof MockHttpServletRequest)
                ((MockHttpServletRequest) req).setServletPath("/junit/mock/path");

            filterchain.doFilter(request, response);
        };
    }
}