How to use Mockito for WebClient get call?

Question

I've been mainly working on Angular and frontend so far and just got into the world of Java Spring to enhance my backend skills. I need to implement the WebClient to do REST calls and was able to do the implementation but stuck on the test class. This is what I have so far:

...codeset/service/impl/CodesetService.java:

@Component
public class CodesetService {
    private final WebClient codesetClient;

    @Autowired
    public CodesetService (@Qualifier("codesetClient") final WebClient codesetClient, RestConfiguration restConfig) {
        this.codesetClient = codesetClient;
    }

    protected List<CodeAll> getCodeset(String codesetName, TracingInfo tracingInfo) {
        return codesetClient
                .get()
                .uri(builder -> builder.queryParam("codeset", codesetName).build())
                .headers(headers -> createHttpHeadersConsumer(tracingInfo))
                .retrieve()
                .bodyToFlux(CodeAll.class)
                .collectList()
                .block();
    }
}

...codeset/rest/RestConfiguration.java:

@Configuration
public class RestConfiguration {
    private final String codesetServiceUrl;
    private final String codeAllPath;

    public RestConfiguration(
            @Value("${codeset-service.url}") String codesetServiceUrl,
            @Value("${codeset-service.codeAllPath}") String codeAllPath
    ) {
        this.codesetServiceUrl = codesetServiceUrl;
        this.codeAllPath = codeAllPath;
    }

    @Bean("codesetClient")
    public WebClient codesetClient() {
        final var builder =
                new WebClientBuilder(
                        codesetServiceUrl + codeAllPath,
                        null,
                        null,
                        null,
                        null,
                        Optional.empty(),
                        Optional.empty());

        return builder.build();
    }

    public String getCodesetServiceUrl() {
        return codesetServiceUrl;
    }

    public String getCodeAllPath() {
        return codeAllPath;
    }
}

Does this look correct to you so far?

Then, in the test class, how to implement the WebClient mock using Mockito? See the comment in the code block.

...codeset/service/impl/CodesetServiceTest.java:

class CodesetServiceTest {
@Mock
WebClient codesetClient;

private List<CodeAll> createCodeList(String code) {
    return Collections.singletonList(
            CodeAll.builder().code(code).endDate(LocalDate.now().plusDays(1)).build());
}

@BeforeEach
public void setUp() {
    MockitoAnnotations.openMocks(this);
    underTest =
            new CodesetService(
                    codesetClient, restConfig);
    when(restConfig.getCodesetServiceUrl()).thenReturn("getCodesetServiceUrl");
    when(restConfig.getCodeAllPath()).thenReturn("/getCodeAllPath");

    // Here, how to call the "getCodesetServiceUrl/getCodeAllPath?codeset=code-set-name" using Mockito?
    // Response type would be <List<CodeAll>> and return: createCodeList("code")
}

}

Any help would be appreciated!