public interface ProductTestService {  
    String getProduct(String productId);
}

@Service
public class ProductTestServiceImpl implements ProductTestService {
    @Override
    public String getProduct(String productId) {
        return "苹果" + productId;
    }
}

public class ProductTestServiceImplTest2 extends BaseMockitoUnitTest {
    @InjectMocks
    private ProductTestServiceImpl productTestService;

    @Test
    void testGetProduct_success() {
        String result = productTestService.getProduct("1");
        System.out.println(result);
    }
}