如何模拟公共API (第三方API)生成spring restdocs

<dependency>
    <groupId>org.springframework.restdocs</groupId>
    <artifactId>spring-restdocs-mockmvc</artifactId>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.springframework.restdocs</groupId>
    <artifactId>spring-restdocs-asciidoctor</artifactId>
    <version>2.0.5.RELEASE</version>
    <scope>test</scope>
</dependency>

import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.restdocs.JUnitRestDocumentation;
import org.springframework.restdocs.mockmvc.MockMvcRestDocumentation;
import org.springframework.restdocs.mockmvc.RestDocumentationResultHandler;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import org.springframework.web.context.WebApplicationContext;

import static org.springframework.restdocs.mockmvc.MockMvcRestDocumentation.documentationConfiguration;

public class ApiDocumentation {

    @Rule
    public final JUnitRestDocumentation restDocumentation = new JUnitRestDocumentation();

    private RestDocumentationResultHandler documentationHandler;

    @Autowired
    private WebApplicationContext context;

    private MockMvc mockMvc;

    @Before
    public void setUp() {
        this.documentationHandler = MockMvcRestDocumentation.document("{method-name}",
                Preprocessors.preprocessRequest(Preprocessors.prettyPrint()),
                Preprocessors.preprocessResponse(Preprocessors.prettyPrint()));

        this.mockMvc = MockMvcBuilders.webAppContextSetup(this.context)
                .apply(documentationConfiguration(this.restDocumentation))
                .alwaysDo(this.documentationHandler)
                .build();
    }

    @Test
    public void testApi() throws Exception {
        this.mockMvc.perform(get("/api/endpoint"))
                .andExpect(status().isOk())
                .andExpect(content().contentType(MediaType.APPLICATION_JSON))
                .andExpect(jsonPath("$.property").value("value"))
                .andDo(this.documentationHandler.document(
                        responseFields(
                                fieldWithPath("property").description("The property description")
                        )
                ));
    }
}