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Selected Topics in Software Engineering - Distributed Software Development

Selected Topics in Software Engineering - Distributed Software Development. Testing. Tihana Knaffl. Testing. demonstrates the presence of program faults Software product should: conform to its specifications meet the customers needs to satisfy these objectives:

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Selected Topics in Software Engineering - Distributed Software Development

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  1. Selected Topics in Software Engineering-Distributed Software Development

  2. Testing Tihana Knaffl

  3. Testing • demonstrates the presence of program faults • Software product should: • conform to its specifications • meet the customers needs • to satisfy these objectives: • verification and validation - V&V

  4. Verification and validation • Verification: Are we building the right product? • Validation: Are we building the product right? • V&V : • should estabilish confidence that the software is fit for purpose • should be applied at each stage in the software development process

  5. Static and dynamic V&V tehniques • Static: • Software inspections • analysis and checking of the static system representation • Dynamic: • Software testing • exercising and observing product behaviour

  6. Static and dynamic V&V tehniques

  7. Software testing • Statistical testing • measures software preformance and reliability • test designed to reflect the frequence of user inputs • Defect testing • revealing the presence of defects in the system • not concerened with locating and correcting defects (debbugging)

  8. Defect testing • impossible to be exhaustive • it is more important to test the parts of the system which are commonly used • different approaches: • functional testing • structural testing • interface testing

  9. Testing process • testing in stages

  10. Testing process • Object-oriented system testing • Objects are not necessarily integrated into sub-systems • cluster testing • testing a group of cooperating objects • thread testing • test a processing thread as it weaves from object to object

  11. Test planning • testing should be scheduled as a part of the project planning process • testing requires adequate resources • The test plan: • The testing process • Requirements traceability • Tested items • Testing schedule • Test recording procedures • Hardware and software requirements • Constraints

  12. The V-model of development

  13. Testing strategies • ways of approaching the testing process • top-down testing • bottom-up testing • thread testing • stress testing • back to back testing • Different strategies may be applied at different stages of the testing process • Large systems are usually tested comining different strategies

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