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单元测试是保证代码质量的第一道防线。SpringBoot 内置了 JUnit 5，Mockito 可以模拟外部依赖。

一、依赖

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

二、Service 层测试

@SpringBootTestclassSeckillServiceTest{@AutowiredprivateSeckillServiceseckillService;@TestvoidtestDoSeckill(){// 测试正常的秒杀流程ResultVOresult=seckillService.doSeckill(1L,1001L,"测试用户");assertThat(result.getCode()).isEqualTo(200);}}

三、Mock 测试

@ExtendWith(MockitoExtension.class)classOrderServiceTest{@MockprivateOrderMapperorderMapper;@InjectMocksprivateOrderServiceorderService;@TestvoidtestCreateOrder(){Orderorder=newOrder();order.setOrderNo("ORD001");when(orderMapper.insert(any())).thenReturn(1);assertThat(orderService.create(order)).isTrue();}}

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