RestTemplate异常在测试Spring boot应用程序时找不到转换器

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web-services</artifactId>
</dependency>

@Configuration
public class AppConfig {
    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }
}

@Configuration
public class AppConfig {
    @Bean
    public RestTemplate restTemplate() {
        RestTemplate restTemplate = new RestTemplate();
        restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
        return restTemplate;
    }
}

@SpringBootTest
public class MyTest {
    @Autowired
    private RestTemplate restTemplate;

    @Test
    public void test() {
        // 使用RestTemplate发送HTTP请求
    }
}