Software Testing Łukasz Wojcieszek s2690 Tomasz Wyrzuc s2675

Agenda What is testing? Types of Testing System test Tools Common mistakes

What is testing ? „Testing is the process of executing a program with the intent of finding errors” Dr Glen Myers

Major Terms Verification Validation

Main Testing Goals Detection and deletion of errors in applications Evaluation of software reliability

Audit Review and evaluation of software done by independent organization, testers (whatever)

Inspection This form of testing is specialized in detailed evaluation of source code, whole project or a component. It is done by special group of people (not authors).

Types of Testing Error detection Dynamic test Static test – based on source code analyzes Static test – based on detection of common mistakes

Types of Testing 2 Functional Tests – black box Structural Tests – white box

What also should be tested? System efficiency Used Hardware Resources System Protection System Interface

What also should be tested? Portability Software maintainability Software security Susceptibility for modifications

What also should be tested ? Documentation quality Efficiency during heavy system load User satisfaction

Heavy load test Stress test Robustness test

White Box testing … our goal is to ensure that all statements and conditions have been executed at least once …

Black Box testing

Reliability measurements Probability of wrong executions Frequency of errors Time between errors Accessibility

Typical Errors Uninitiated variables Index out of table bounds Errors in conditional instructions Never-ending loops Improper use of brackets Wrong operations on pointers

System tests Upward testing Downward testing

Loop testing Recommendations of choosing entrance data: Minimal number of iterations Maximum number of iterations Average number of iterations

Testing tools Debuggers Coverage analysers Comparators

Debuggers Useful for inner testing and testing by people not connected with project. Rules of white-box testing Debugger properties

Coverage analysers Summing data from few testing processes Projecting steering graphs Shows information about coverage Operating in environment of software development

Comparators Allow to compare two programs, files, to show similarities and differences Often used to compare testing results with expected results

Best Practices Basic Practices Foundational Incremental

Common mistakes The Role of Testing Planning the Testing Effort Personnel Issues The Tester at Work Technology Rampant

Main testing results Improved code, project, model and requirements specification Testing processes report Estimation of software reliability and costs of maintenance

Software testing - related links

The End

SYSTEM CRASH!