This is where another method of testing, unit testing, comes into play.
这时，我们需要使用另一种测试方法，那就是单元测试。
The play method implementation of the drw.SlotMachine class looks like this
SlotMachine类的play方法实现是这样的
The play method implementation of the drw.SlotMachine class looks like this
SlotMachine类的play方法实现是这样的
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