Chapter 9 testing the systemChapter 9 testing the system.ppt

* * * * * * * * * * * * * * * * Chapter 9 Testing the System 2. Types of Performance tests ?several types of performance tests A: stress tests（压力测试 / 强度测试） (在短时间内加载极限负荷, 以验证系统能力) B: volume tests（巨量数据测试 / 容量测试） (验证系统处理巨量数据的能力) C: configuration tests（配置测试） ---构建测试用例 对系统软硬件的各种配置(最小到最大)进行测试。 D: compatibility tests（兼容性测试）---测试接口等 E: regression tests (by old and new test cases) F: security tests ( security requirement ) G: timing tests H: environment tests * Chapter 9 Testing the System I: quality tests J: recovery tests K: human factors test ( use interface-----usability) ?focus on: A: performance test ----more difficult than function test B: requirement must be explicit to ensure performance test C: requirement quality is often been reflected in the ease of performance testing (需求质量通常可以反映在性能测试的容易度上) * Chapter 9 Testing the System 9.4 Reliability,Availability,Maintainability （可靠性，可用性，可维护性） (关于性能测试) focus:A: performance test----Reliability, Availability, Maintainability----is critical issues B: it is difficult to measure directly before delivery 1. Definitions software reliability : ( probability : 0 1 ) ----软件系统在给定的时间间隔和给定条件下运行 成功的概率 availability: ( 0/1 ) ----软件系统在给定的时间点（按SRS要求）成功 运行的概率 * Chapter 9 Testing the System maintainability: ( 0 1 ) ----是指在给定的使用条件（预定的时间 间隔、维护程序、维护资源之下进行维 护）下，维护活动能被执行的概率 2. Four different levels of failure severity(严重性) A: reason: because reliability, availability, and maintainability are defined in terms of failures, they must be measu