Software Testing - SDLC Model
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The document discusses software testing, a process to assess the correctness and quality of software through various methodologies like black and white box testing. It details the software development life cycle (SDLC), testing types, and their significance in ensuring that software meets specified requirements with minimal cost. Key concepts include verification, validation, error definitions, testing stages, and an emphasis on planning effective testing to avoid unnecessary expenditure.
Software Testing - SDLC Model
- 1. Software Engineering Dr. Kamal Gulati (Part 6) – Software Testing
- 2. It is the process used to identify the correctness, completeness and quality of developed computer software. It is the process of executing a program/application under positive and negative conditions by manual or automated means. It checks for the :- Specification Functionality Performance INTRODUCTION
- 3. OBJECTIVES Uncover as many as errors (or bugs) as possible in a given product. Demonstrate a given software product matching its requirement specifications. Validate the quality of a software testing using the minimum cost and efforts. Generate high quality test cases, perform effective tests, and issue correct and helpful problem reports.
- 4. Error, Bug, Fault & Failure Error : It is a human action that produces the incorrect result that produces a fault. Bug : The presence of error at the time of execution of the software. Fault : State of software caused by an error. Failure : Deviation of the software from its expected result. It is an event.
- 5. Standard model used word wide to develop a software. A framework that describes the activities performed at each stage of a software development project. Necessary to ensure the quality of the software. Logical steps taken to develop a software product. SDLC(Software Development Life Cycle)
- 6. Feasibility Study Requirements Analysis & Specification Design Coding & Unit Testing Integration & System Testing Maintenance Classical Waterfall Model It is the oldest and most widely used model in the field of software development.
- 7. Project Initiation System Study Summary Reports Analysis Regression Test Report Defects Execute Test Cases ( manual /automated ) Design Test Cases Test Plan Testing Life Cycle
- 8. Test Plan It is a systematic approach to test a system i.e. software. The plan typically contains a detailed understanding of what the eventual testing workflow will be.
- 9. Test Case It is a specific procedure of testing a particular requirement. It will include: Identification of specific requirement tested Test case success/failure criteria Specific steps to execute test Test data
- 10. • Verification: The software should confirm to its specification (Are we building the product right?) • Validation: The software should do what the user really requires (Are we building the right product?) Verification vs Validation
- 11. Testing Methodologies Black box testing White box testing
- 12. Black box testing No knowledge of internal program design or code required. Tests are based on requirements and functionality. White box testing Knowledge of the internal program design and code required. Tests are based on coverage of code statements, branches, paths, conditions.
- 14. White box testing Component code Test outputs Test data DerivesTests
- 15. Testing Levels • Unit testing • Integration testing • System testing
- 16. UNIT TESTING Tests each module individually. Follows a white box testing (Logic of the program). Done by developers.
- 17. INTEGRATION TESTING Once all the modules have been unit tested, integration testing is performed. It is systematic testing. Produce tests to identify errors associated with interfacing. Types: Big Bang Integration testing Top Down Integration testing Bottom Up Integration testing Mixed Integration testing
- 18. SYSTEM TESTING The system as a whole is tested to uncover requirement errors. Verifies that all system elements work properly and that overall system function and performance has been achieved. Types: Alpha Testing Beta Testing Acceptance Testing Performance Testing
- 19. Alpha Testing It is carried out by the test team within the developing organization . Beta Testing It is performed by a selected group of friendly customers. Acceptance Testing It is performed by the customer to determine whether to accept or reject the delivery of the system. Performance Testing It is carried out to check whether the system meets the nonfunctional requirements identified in the SRS document.
- 20. Types of Performance Testing: Stress Testing Volume Testing Configuration Testing Compatibility Testing Regression Testing Recovery Testing Maintenance Testing Documentation Testing Usability Testing
- 21. In order to be cost effective, the testing must be concentrated on areas where it will be most effective. DISCUSSION The testing should be planned such that when testing is stopped for whatever reason, the most effective testing in the time allotted has already been done. The absence of an organizational testing policy may result in too much effort and money will be spent on testing, attempting to achieve a level of quality that is impossible or unnecessary.
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