Unit testing defines a written contract about the behavior of each unit.

单元测试定义一个有关每个单元的行为的书面合同。

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Second, we can fulfill the testing end of that contract.

第二，我们可以达成该契约的测试终点。

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Unit testing and Design by Contract

单元测试和契约式设计

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Unit testing and Design by Contract

单元测试和契约式设计

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