Use case design is the focus
Functional use case design - whether the function is normal; whether the function is implemented according to the interface document.
Logic use case design - whether there is any dependent business (SMS verification is required before logging in; you should log in before placing an order)
Abnormal test case design - parameter exception (keyword parameter, parameter is empty, more, less parameters, wrong parameter) and data exception (keyword data, data is empty, inconsistent length, wrong data)
Security interface test case design - 1. cookie (logically dependent on business); 2. header; 3. unique identification code
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