40.3.9 自动配置的REST客户端

你可以使用@RestClientTest测试REST客户端，它默认会自动配置Jackson和GSON，配置RestTemplateBuilder，并添加MockRestServiceServer支持。你需要将@RestClientTest的value或components属性值设置为待测试类：

@RunWith(SpringRunner.class)
@RestClientTest(RemoteVehicleDetailsService.class)
public class ExampleRestClientTest {
    @Autowired
    private RemoteVehicleDetailsService service;
    @Autowired
    private MockRestServiceServer server;
    @Test
    public void getVehicleDetailsWhenResultIsSuccessShouldReturnDetails()
            throws Exception {
        this.server.expect(requestTo("/greet/details"))
                .andRespond(withSuccess("hello", MediaType.TEXT_PLAIN));
        String greeting = this.service.callRestService();
        assertThat(greeting).isEqualTo("hello");
    }
}

在附录中可以查看@RestClientTest启用的自动配置列表。