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Regression and performance testing

This document discusses software regression testing and performance testing. It defines regression testing as retesting software after changes to check for defects in modified areas and unaffected areas. Regression testing happens at the unit, integration, and system levels and requires analyzing software changes and impacts. Performance testing evaluates a system's compliance with performance requirements by testing response times under various loads. It helps ensure applications meet customers' expectations as defined in SLAs. The document discusses performance testing tools and benefits of the approach while cautioning that performance testing is as much an art as a science due to the many variables involved.

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Performance Testing• Regression Testing•
SOFTWARE REGRESSION AND PERFORMANCE TESTING Dr. Himanshu Hora SRMS College of Engineering & Technology Bareilly (INDIA)
What is Software Regression Testing? What is Software Regression Testing? - Testing activities occur after software changes. - Regression testing usually refers to testing activities during software maintenance phase. Major testing objectives: - Retest changed components (or parts) - Check the affected parts (or components) Regression testing at different levels: - Regression testing at the unit level - Re-integration - Regression testing at the function level - Regression testing at the system level
What is Software Regression Testing? Who perform software Regression: Developers - regression testing at the unit level or integration Test engineers - regression testing at the function level QA and test engineers - regression testing at the system level What do you need to perform software regression testing? - Software change information (change notes). - Updated software REQ and Design specifications, and user manuals. - Software regression testing process and strategy. - Software regression testing methods and criteria.
Problems and Challenges in Software Regression Testing Major problems in software regression testing: - How to identify software changes in a systematic way? - REQ. specification changes - Design specification changes - Implementation (or source code) changes - User manual changes - Environment or technology changes - Test changes - How to identify software change impacts in a systematic way? - REQ impacts - Design impacts - Implementation impacts - User impacts - Test impacts
Problems and Challenges in Software Regression Testing Major regression testing problems: - How to use a systematic method or tool to identify changed software parts? - How to use a systematic method or tool to identify software change impacts? - How to use a systematic method or tool to identify affected software test cases? - How to reduce the re-test suites? - How to select the test cases in a test suite? Major challenge in software regression testing: - How to minimize re-testing efforts, and achieve the adequate testing coverage?
Software Regression Process Software Regression Process: Step #1: Software Change Analysis - Understand and analyze various software changes. Step #2: Software Change Impact Analysis - Understand and analyze software change impacts Step #3: Define Regression Test Strategy and Criteria Step #4: Define, select, and reuse test cases to form a regression test suite Step #5: Perform re-testing at the different levels. - re-testing at the unit level - re-testing at integration level - re-testing at the function level - re-testing at the system level Step #6: Report and analyze regression test results
Software Regression Process Software Change Analysis Software Change Impact Analysis Define Regression Testing Strategy Build Regression Test Suite Run Regression Tests at different levels Report Retest Results
“With an order of magnitude fewer variables performance testing could be a science, but for now, performance testing is at best a scientific art.” --Scott Barber Vice President & Executive Director, Association for Software Testing www.associationforsoftwaretesting.org
PERFORMANCE TESTING What Testing conducted to evaluate the compliance of a system or component with specified performance requirements (IEEE). Why To meet/exceed the customers’ expectations as per the agreed SLAs (Service Level Agreements) for the response time of different business functions. How - Outsourcing - In house with Purchased Tools - In house with Leased Tools 9
Good Performance…?
Define Performance Testing  Stress Testing: Stress Testing is done in order to check when the application fails by varying the system resources such as RAM, HDD etc. and keeping the number of users as constant.  Load Testing: Load Testing is done in order to check when the application fails by increasing the number of users and keeping the system resources as constant.  Performance Testing: The term Performance can mean measuring response time, number of hits , resource utilization, or some other system characteristic( or group of them), by varying the number of users.
Performance Testing Tools • • • • HP-LoadRunner Compuware-QA Load IBM-Rational Performance Tester Borland-Silk Performer
Benefit of Performance Testing If done well, there can be benefits: • Dramatically reduce the overhead involved in managing test environments • Easier for performance testing to have it’s own test environment • Enable collaborative tuning without having to “borrow” hardware resources • Put the test team in control of their test environments Virtualization does not change the core principles of successful performance testing
SUMMARY:“Only performance testing at the conclusion of system or regression testing is like ordering a diagnostic blood test after the patient is dead.” --Scott Barber Vice President & Executive Director, Association for Software Testing www.associationforsoftwaretesting.org
REFERENCES • • • • • www.sqe.com/ControlImages/sqe/.../empirix_archivepresentation www.qaiconferences.org/tempEQAA/Performance%20testing https://wiki.uta.edu/download/attachments/48170179/Testing www.idi.ntnu.no/emner/tdt4242/materials/Regression-testing www.engr.sjsu.edu/gaojerry/course/287/regression-test
Thank You Dr. Himanshu Hora SRMS College of Engineering & Technology Bareilly (INDIA)