高级软件工程课件-软件测试.ppt

Testing the Programs
中国科学技术大学软件学院
孟宁
2012年12月
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Contents
Software Faults and Failures
Testing Issues
Unit Testing
Integration Testing
Testing Object Oriented Systems
Test Planning
Automated Testing Tools
When to Stop Testing
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Chapter 8 Objectives
Types of faults and how to clasify them
The purpose of testing
Unit testing
Integration testing strategies
Test planning
When to stop testing
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Software Faults and FailuresWhy Does Software Fail?
Wrong requirement: not what the customer wants
Missing requirement
Requirement impossible to implement
Faulty design
Faulty code
Improperly implemented design
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Software Faults and Failures Objective of Testing
Objective of testing: discover faults
A test is essful only when a fault is discovered
Fault identification is the process of determining what fault caused the failure
Fault correction is the process of making changes to the system so that the faults are removed
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Software Faults and FailuresTypes of Faults
Algorithmic putation and precision fault
a formula’s implementation is wrong
Documentation fault
Documentation doesn’t match what program does
Capacity or boundary faults
System’s performance not acceptable when certain limits are reached
Timing or coordination faults
Performance faults
System does not perform at the speed prescribed
Standard and procedure faults
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Software Faults and FailuresTypical Algorithmic Faults
An algorithmic fault occurs when ponent’s algorithm or logic does not produce proper output
Branching too soon
Branching too late
Testing for the wrong condition
Forgetting to initialize variable or s