WebTestClient returns 404 instead of 200

I am testing the REST layer of my reactive SpringBoot (3) app and using Spring's WebTestClient:

@ExtendWith(SpringExtension.class)@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)@ContextConfiguration(classes = ReferenceDataApplication.class)public class RefDataResourceTest {    @Autowired    private WebTestClient webTestClient;    @BeforeEach    void setup() {        webTestClient = WebTestClient.bindToController(new RefDataResource()).build();    }    @Test    public void shouldGetReferenceDataByTypeCode() {        webTestClient                .get()                .uri("/api/projects/refData/findByCode")                .exchange()                .expectStatus().isOk();    }}

I defined /api/projects/ as base-path in Spring, and my resource implements the delegate generated by OpenApi generation of the yaml contract:

@Componentpublic class RefDataResource implements RefDataApiDelegate {    @Override    public Mono<ResponseEntity<Flux<RefDataElementDTO>>> findDataByCode(String code,                                                                              ServerWebExchange exchange) {        return Mono.just(ResponseEntity.ok().build());    }}

When I run the SpringBoot application, I can use Postman to hit the endpoint and I can get the expected 200, however when I use the WebTestClient above I keep getting 404. What am I doing wrong here?