When you test a module, especially when you use TDD to drive the design of the code, you shouldn’t test classes or functions in isolation. Going “too low” with the unit tests (class by class, method by method) takes away almost all “Characteristics of good tests” (as described above). That’s because you don’t test the key element of the design, that is the interactions between classes/functions. Such a test suite exhibits an excessive usage of a mocking framework (and it’s a sign of a bad test suite; probably a large number of tests only check that method A invokes method B).
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另一方面，多数零食大包装采用“春节定制包装+厂家现有产品”的组合形式，而春节销量存在诸多不确定性，一旦销售未达预期，后续在厂家→经销商→终端的流通链条中，无论是折价清仓还是拆整售零，都会给全链路带来直接利益损失。换句话说，厂商在春节大包装布局上，面对的并非简单的“做大做小”选择，而是“卖得快”与“卖得久”的核心抉择。