前言

老实我以前也没写过单元测试（小公司没要求），都是postman自测OK就提交了
这里第一次写，还废了点时间
做个笔记下次直接抄吧

jar包版本号

        <!-- 测试用 start -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <version>2.5.6</version>
        </dependency>
        <!-- 测试用 end -->

单元测试代码

package com.mea.pay.transaction;

import cn.hutool.core.date.DateTime;
import com.alibaba.fastjson.JSON;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.mea.pay.api.dto.transaction.PaymentRecordPayerRemarkUpdateDTO;
import com.mea.pay.transaction.controller.PaymentRecordController;
import com.mea.pay.transaction.dos.PaymentRecordDO;
import com.mea.pay.transaction.service.PaymentRecordService;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.http.MediaType;
import org.springframework.test.context.ActiveProfiles;
import org.springframework.test.web.servlet.MockMvc;

import java.math.BigDecimal;

import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;
import static org.springframework.test.web.servlet.result.MockMvcResultHandlers.*;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;
import static org.springframework.test.web.servlet.setup.MockMvcBuilders.*;

/**
 * 支付 单元测试
 *
 * @author Heng.Wei
 * @date 2022-05-05
 **/
@ActiveProfiles("dev")
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.MOCK)
public class PaymentRecordControllerTest {

    /** 单元测试 - 支付方用户ID */
    private static final Long UNIT_TEST_PAYMENT_USER_ID = 1L;
    /** 单元测试 - 查询用的请求ID */
    private static final String UNIT_TEST_PAYMENT_RECORD_REQUEST_ID = "UNIT_TEST_1";
    /** 单元测试 - 查询用的主键ID */
    private static Long UNIT_TEST_PAYMENT_RECORD_ID;

    @Autowired
    private PaymentRecordService paymentRecordService;
    private MockMvc mockMvc;

    @BeforeEach
    void setUp() {
        mockMvc = standaloneSetup(new PaymentRecordController(paymentRecordService))
                .defaultRequest(get("/").accept(MediaType.APPLICATION_JSON))
                .alwaysExpect(status().isOk())
                .alwaysExpect(content().contentType("application/json"))
                .build();
        // 初始化测试数据
        initTestData();
    }

    /** 初始化测试数据 */
    void initTestData() {

        PaymentRecordDO recordDO = paymentRecordService.getOne(new LambdaQueryWrapper<PaymentRecordDO>() {{
            eq(PaymentRecordDO::getRequestId, UNIT_TEST_PAYMENT_RECORD_REQUEST_ID);
        }});
        if (recordDO == null) {
            recordDO = new PaymentRecordDO();
            recordDO.setRequestId(UNIT_TEST_PAYMENT_RECORD_REQUEST_ID)
                    .setAmount(new BigDecimal(100))
                    .setCurrency("USD")
                    .setPlatformId(1L)
                    .setTransChannel(1)
                    .setInitiator(UNIT_TEST_PAYMENT_USER_ID)
                    .setPayerPan("UNIT_TEST_PAN");
            paymentRecordService.save(recordDO);
        }
        UNIT_TEST_PAYMENT_RECORD_ID = recordDO.getId();
    }

    /**
     * <pre>
     * /payment/request/{requestId}
     * 根据请求唯一ID获取支付记录
     * </pre>
     **/
    @Test
    void getPaymentRecordByRequestId() throws Exception {

        mockMvc.perform(get("/payment/request/" + UNIT_TEST_PAYMENT_RECORD_REQUEST_ID)
                        .accept(MediaType.APPLICATION_JSON))
                .andDo(print())
                .andExpect(status().isOk());
    }

    /**
     * <pre>
     * /payment/{id}
     * 根据主键ID查询支付记录详情
     * </pre>
     **/
    @Test
    void getPaymentRecordById() throws Exception {
        mockMvc.perform(get("/payment/" + UNIT_TEST_PAYMENT_RECORD_ID)
                        .accept(MediaType.APPLICATION_JSON))
                .andDo(print())
                .andExpect(status().isOk());
    }

    /**
     * <pre>
     * 修改支付记录的用户备注信息
     * /payment
     * </pre>
     **/
    @Test
    void updatePaymenRecordPayerRemark() throws Exception {
        PaymentRecordPayerRemarkUpdateDTO updateDTO = new PaymentRecordPayerRemarkUpdateDTO();
        updateDTO.setId(UNIT_TEST_PAYMENT_RECORD_ID);
        updateDTO.setPayerRemark("unit test：" + DateTime.now());
        updateDTO.setPicurl("unit test");
        updateDTO.setTags("unit test");

        mockMvc.perform(put("/payment")
                        .accept(MediaType.ALL_VALUE)
                        .contentType(MediaType.APPLICATION_JSON)
                        .content(JSON.toJSONString(updateDTO))
                )
                .andDo(print())
                .andExpect(status().isOk());
    }

    /**
     * <pre>
     * /list/{userId}
     * </pre>
     **/
    @Test
    void listPaymentRecords() throws Exception {
        mockMvc.perform(get("/payment/list/" + UNIT_TEST_PAYMENT_USER_ID)
                        .accept(MediaType.APPLICATION_JSON))
                .andDo(print())
                .andExpect(status().isOk());
    }
}

测试结果

理论上单元测试是要求可重复验证才对，这里是OK的