对数字系统的测试依据的基本思想是暗箱理论，数字系统的在线测试通常分为测试生成、测试评价和测试实施三个阶段。
The basic theory of digital system is dark-box . On-line testing of digital system is divided into three stages : test generating , test evaluating ' and test implementing .
暗箱理论