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文章探讨了如何通过有限状态机模型来测试电梯的工作逻辑，提供了一种不依赖内部实现的测试方法。
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文章介绍了一道关于如何测试电梯的著名面试题。作者最初认为不了解电梯内部实现原理难以设计测试用例，但后来发现可以从计算模型的角度来考察。通过将电梯抽象为有限状态机模型，可以模拟电梯的工作逻辑（如开关门、升降决策等），并针对该模型设计测试用例。这种方法不依赖具体工程实现，而是基于电梯的通用工作逻辑，是一种很好的思维训练方式。
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