如何用Junit和Mockito测试和双值？

Question

我在我的Java，Spring Boot控制器中创建了一个函数，它允许我根据参数获得数据的和值，这很有效。然而，我很难理解用Junit和Mockito测试这个功能的最佳方式是什么？到目前为止，我已经创建了一个测试函数，它返回一个特定数组字段的值。如何能够返回。thenreturn（）中的值，该值根据给定的serviceID求和？任何帮助或建议任何其他有用的帖子将被感谢，因为我无法找到任何相关的或我看错了地方。谢谢

下面我展示了我的控制器中的函数

@GetMapping("/orders/test/{serviceId}")
public Double findRevenueByService(@PathVariable Long serviceId){
    log.info("Start of findRevenueByService method {}", serviceId);
    return repository.findPaymentRevenue(serviceId);
}

@Query("select SUM(o.amount) from ORDERS o where o.serviceId = :serviceId")
Double findPaymentRevenue(@Param("serviceId") Long serviceId);

package PPBackend.controller;

import PPBackend.domain.Order;
import PPBackend.repository.OrderRepository;

import lombok.extern.slf4j.Slf4j;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;


import org.springframework.http.MediaType;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;

import java.time.LocalDateTime;
import java.util.ArrayList;

import java.util.List;

import static org.mockito.Mockito.when;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;

import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;

@Slf4j
public class OrdersControllerTest {    
    @InjectMocks
    private OrdersController controller;    
    private MockMvc mockMvc;    
    @Mock
    private OrderRepository repository;    
    private List<Order> orders = new ArrayList<>();    
    @Before
    public void setUp() {
        MockitoAnnotations.initMocks(this);
        this.mockMvc = MockMvcBuilders.standaloneSetup(controller).build();
        orders.add(new Order(1L,1L,10.00, 50.00,LocalDateTime.now(),LocalDateTime.now()));
        orders.add(new Order(2L,2L,20.00, 50.00,LocalDateTime.now(),LocalDateTime.now()));
        orders.add(new Order(3L,1L,30.00, 50.00,LocalDateTime.now(),LocalDateTime.now()));
        orders.add(new Order(4L,3L,40.00, 50.00,LocalDateTime.now(),LocalDateTime.now()));
        orders.add(new Order(5L,1L,50.00, 50.00,LocalDateTime.now(),LocalDateTime.now()));
    }

    @After
    public void tearDown() {
        orders = new ArrayList<>();
    }

    @Test
    public void findRevenueByService() throws Exception {
        final Long serviceId = 1L;
        when(repository.findPaymentRevenue(serviceId)).thenReturn(orders.get(0).getAmount());
        this.mockMvc.perform(get("/api/test/" + serviceId)).andExpect(status().isOk())
                .andExpect(content().contentType(MediaType.APPLICATION_JSON_UTF8_VALUE))
                .andExpect(jsonPath("$").isNotEmpty())
                .andExpect(jsonPath("$").value(10.00))
                .andExpect(status().isOk());
    }
}

private Long id;
private Long serviceId;
private Double amount;
private Double credit;
private LocalDateTime created;
private LocalDateTime lastEdited;

Answer 1

通过使用Java8解决了这个问题：从列表中的对象的特定字段中求和值作为参考，需要做一些轻微的修改