请注意依赖性和指令都是可选的；只有目标和冒号才是必须的。

Note that both the dependencies and the instructions are optional; only the target and the colon are required.

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可选的：创建单元测试以确保原始目标对象的工厂方法仍返回正确的非模仿对象。

Optional: create a unit test to assure that the original target object's factory method still returns the correct, non-mock object.

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KPI——通过时间间隔和其他维度限定的聚合度量，附带表示预期目标和阈值的可选属性。

KPI — aggregated metric qualified by time period and other dimensions, with optional attributes to represent expected targets and thresholds.

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