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

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。

youdao

Whether a test data subset with optional privacy masking should be created.

是否创建带有可选屏蔽的测试数据子集。

youdao

Although this is optional, it is a good test to check that the system has been configured correctly.

虽然这是可选的，但是可以很好地检查系统是否配置正确。

youdao

The optional moonlight blue sheen on my test created bit of unexpected pizazz to the exterior.

FORBES: Car of the Week: 2013 Audi allroad 2.0T quattro tiptronic

Fortunately, my test truck had the optional rearview video camera.

CNN: Chevy Avalanche: Big truck for the real world

Not optional will be the use of standardized test scores.

WSJ: Conn. Joining Teacher Trend