用例中的前置条件和后置条件

最新推荐文章于 2025-06-08 13:30:22 发布

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最新推荐文章于 2025-06-08 13:30:22 发布

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分类专栏：其他技术文章标签：用例前置条件后置条件 preconditions Post-conditions

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本文详细解释了用例中的前置条件和后置条件的概念。前置条件描述了触发用例执行前系统的状态；而后置条件则定义了用例执行完毕后系统的状态，无论执行的是主线流程还是备选流程。

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A preconditions section definesall the conditions that must be true (i.e., describes the state ofthe system) for the trigger to meaningfully cause the initiation ofthe use case

Post-conditions are thestates the system can be in after the use case ends，such as systemstate or persistent data that is left when the use case iscomplete

A post-condition for a use case should be trueregardless of which alternative flows were executed; it should notbe true only for the main flow. If something could fail, you wouldcover that in the post-condition by saying “The action iscompleted, or if something failed, the action is not performed,”rather than just “The action is completed.”

eg.

Post-condition for the Control Light Use Case

On leaving this use case, the system remembers the currentbrightness level for the selected On/Off/Dim button