Composite实现了该接口，并维护一个测试集合。

Composite implements this interface and maintains a collection of tests.

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tests （Collection 对象）—— 保存分配的测试集合。

tests (a Collection object) - Holds the set of assigned tests.

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从理论上讲，如果对可交付内容做出了任何变更，都应该执行完整的测试集合。

In theory, the entire test suite should be executed if any change is made to the deliverables.

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