lecture10-软件测试相关度量课件.ppt

Software Metrics;COCOMO;COCOMO: Basic;COCOMO: Intermediate;COCOMO II;Putnam’s SLIM;Test Concepts Estimating Number of Test Case Allocating Test Times Test Coverage Metrics Remaining Defects Metrics;Section 1Test Concepts;防不胜防的软件错误 —— 例1：1963年, 美国, 飞往火星的火箭爆炸, 损失$ 10 million. 原因: FORTRAN循环 DO 5 I = 1, 3 误写为 DO 5 I = 1.3;What is software testing;Software Testing Objectives;1:5-10 Mainframes i.e.,1 tester for every 5 to 10 developers 2:3 Microsoft, 1992 2:1 Lotus (for 1-2-3 Windows) 1:2 Average of 4 major companies,1992 Microsoft, Borland, WordPerfect, Novell;What is a test case?;A test is made up of (many) test cases A test procedure is the detailed instructions for setting up, starting, monitoring and restarting a given test case. a.k.a test plan a test case may be used in more than one test procedure a test case may include many subtests;Test;Testing Methodology;Objective: Cover the software structure;Graph representation of control flow and data flow relationships; Statement Coverage Branch Coverage Condition Coverage Basis Path Coverage All-Edges Coverage All-Paths Coverage ;1 2 3 4 5 6 7 8 9 10 11 12 13 14 15;2,3,4;2,3,4;minimum level coverage using structural testing may be impossible to achieve 100% statement coverage code only executed in exceptional or dangerous circumstances code that is unreachable;2,3,4;Branch Testing：weaknesses;2,3,4;Condition Coverage;2,3,4;2,3,4;Basis path testing：Strengths/weaknesses ;2,3,4;2,3,4;All-Paths testing;All-Paths testing (cont.);2,3,4;How many test cases are needed?;all-statements;Black Box Test;Testing Levels;Overall Approach;Section 2Estimating Number of Test Case  Allocating Test Times ;Estimate No. of Test Cases;Example;Allocating Test Time;Test Time: Systems /1;Test Time: Systems /2;Test Case Invocation;Section 3Test Coverage Metrics;Test Coverage Metrics /1;Test Coverage /1;Test Coverage /2;Test Coverage /3;Test Coverage /4;Test Pass, Failure Pending Rate/1;Test Pas