本文介绍了如何在测试中模拟外部依赖关系?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我已经在实现中使用外部包装箱对汽车进行了建模和实现:
I've modeled and implemented a car using an extern crate inside the implementation:
extern crate speed_control; struct Car; trait SpeedControl { fn increase(&self) -> Result<(), ()>; fn decrease(&self) -> Result<(), ()>; } impl SpeedControl for Car { fn increase(&self) -> Result<(), ()> { match speed_control::increase() { // Here I use the dependency // ... } } // ... }我想测试上面的实现,但是在我的测试中,我不想让speed_control::increase()像生产时那样运行-我想对其进行模拟.我该如何实现?
I want to test the implementation above, but in my tests I don't want speed_control::increase() to behave like it was in production - I want to mock it. How can I achieve this?
推荐答案我建议您将后端功能speed_control::increase包装为某些特征:
I would suggest you wrap the back-end function speed_control::increase in some trait:
trait SpeedControlBackend { fn increase(); } struct RealSpeedControl; impl SpeedControlBackend for RealSpeedControl { fn increase() { speed_control::increase(); } } struct MockSpeedControl; impl SpeedControlBackend for MockSpeedControl { fn increase() { println!("MockSpeedControl::increase called"); } } trait SpeedControl { fn other_function(&self) -> Result<(), ()>; } struct Car<T: SpeedControlBackend> { sc: T, } impl<T: SpeedControlBackend> SpeedControl for Car<T> { fn other_function(&self) -> Result<(), ()> { match self.sc.increase() { () => (), } } }更多推荐
如何在测试中模拟外部依赖关系?
发布评论