所有专业功能测试员都会关注他们擅长处理的问题领域，如边界测试、压力测试和公共路径测试。
All professional function testers have their favorite problem areas on which they concentrate, such as bounds testing, stress testing, and common path testing.
通过这种方式，可以测试组件的所有功能、声明有效的行为、检验边界条件并确保适当地将组件降级。
This way, all the functionality of the component can be exercised, valid behavior asserted, boundary conditions explored, and graceful degrading ensured.
如果单元测试跨越类边界，则它就可能是功能测试。
If a unit test crosses class boundaries, it might be a functional test.
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