软测_part 1解析.ppt

* Spiral Model If youre a tester, youll like this model. Youll get a chance to influence the product early by being involved in the preliminary design phases. * Rapid Application Development RAD or V模型 * 改进的V模型 编码 系统功能设计 系统/软件设计 细节设计 接受测试 系统测试 特征测试 单元测试 确认 需求 客户、用户 PM技术支持 校验 设计 设计分析 校验测试 * Summary The highlights of this chapter What major components go into a software product What different people and skills contribute to a software product How software progresses from an idea to a final product Theres no definitive approach. Work the best you can in the development model youre in, applying the testing skills you learn in the rest of this book to create the best software possible. far@ucalgary.ca Part 1 Section 3 The Realities of Software Testing * Contents Testing Axioms Software Testing Terms and Definitions * Testing Axioms Its Impossible to Test a Program Completely The number of possible inputs is very large. The number of possible outputs is very large. The number of paths through the software is very large. The software specification is subjective. You might say that a bug is in the eye of the beholder. Example: the Microsoft Windows Calculator. * 1+1= 1+99999999999999999999999999999999= you can move on to 2+0=, 2+1=, 2+2=, and so on. Eventually youll get to 99999999999999999999999999999999+99999999999999999999999999999999= Next you should try all the decimal values: 1.0+0.1, 1.0+0.2, and so on. The point of this example is to demonstrate that its impossible to completely test a program, even software as simple as a calculator. * Testing Axioms (continued) Software Testing Is a Risk-Based Exercise You cant test everything, and if you dont, you will likely miss bugs. The product has to be released, so you will need to stop testing, but if you stop too soon, there will still be areas untested. What do you do? One key concept that software testers need to learn is how to reduce the huge domain of possible tests into a manageable set, a