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Course: Software Testing Lecture 3 Prepared by: Dr. Salwa Elakeili Instructor: Mrs. Huda Moftah Bohalfhay Faculty of Information Technology  Outline White Box Testing Techniques Activities of a Test Engineer Testing Levels Based on Software Activity...

Course: Software Testing Lecture 3 Prepared by: Dr. Salwa Elakeili Instructor: Mrs. Huda Moftah Bohalfhay Faculty of Information Technology  Outline White Box Testing Techniques Activities of a Test Engineer Testing Levels Based on Software Activity  Recall: Importance of Testing  No matter how well software has been designed and coded, it will inevitably still contain defects  Testing is the process of executing a program with the aim of finding faults.  A “successful” test is one that finds errors, not one that doesn’t find errors  Testing can “prove” the presence of faults, but can not “prove” their absence  Methods of Testing White-Box Testing Black-Box Testing requirements output... our goal is to ensure that all statements and conditions have been executed at least once... input events  White Box - Testing – Also named: open-box, clear box , glass box , logic-driven, Structural Testing – It is a testing technique which evaluates the code and the internal structure of a program. – Test all possible paths of control flow.  White Box Testing / Structural Testing Based on knowledge of internal logic of an application's code Based on coverage of code, statements, branches, paths, conditions coverage We perform White Box Testing to ensure: – That all independent paths within a module have been exercised at least once. – All logical decisions verified on their true and false values. – All loops executed at their boundaries and within their operational bounds internal data structures validity.  White Box Testing Techniques Three Main White Box Testing Techniques  Statement Coverage  Branch Coverage  Path Coverage  White Box Testing Techniques Statement Coverage : it is the method of validating whether each and every line of the code is executed at least once Branch Coverage: Branch” in a programming language is like the “IF statements”. An IF statement has two branches: True and False. So in Branch coverage (also called Decision coverage), we validate whether each branch is executed at least once. Path coverage: Path testing is where all possible paths through the code are defined and covered. It's a time-consuming task.