关键词: 三层体系结构, 单元测试框架, 设计模式, 面向接口编程, NUnit

Abstract: The unit testing is fundamental and also the most important step in the whole testing system. Through the deep research of the characteristics of the three-layer architecture，In this paper a unit testing framework based on the three-layer architecture was proposed,In this architecture,a popular interface-oriented programming was adopted, meanwhile, the flexible designing patterns were used to effectively guide the whole testing process. Currently, the whole framework has been put into practice and also has been proved feasible by practice. It can discover the hidden problems in the process of the software development, more effectively ensure the quality of the Web application procedure and cut down the expense on the latter maintenance.

Key words: three-layer architecture, unit testing framework, design pattern, interface-oriented programming, NUnit