Software Quality-Software Engineering-Lecture Slides, Slides of Software Engineering

Download Software Quality-Software Engineering-Lecture Slides and more Slides Software Engineering in PDF only on Docsity! Software Quality docsity.com Software Verification & Validation * Verification Does the product meet system specifications? Have you built the product right? ¢ Validation Does the product meet user expectations? Have you built the right product? (Boehm) ® docsity.com Software Testing ¢ The correct approach to testing a scientific theory is not to verify it, but to seek to refute the theory — that it has errors. (Popper 1965) The goal of testing is to expose latent defects in a software system before it is put to use. docsity.com Software Testing ¢ A Software tester tries to break the system. ¢ The objective is to show the presence of a defect. * Testing can not show the absence of a defect. It only increases your confidence level in the software. ® docsity.com Limitations of the Testing ¢ A function to compare two strings of characters for equality. bool isStringEqual(char a[], char b[]); docsity.com Limitations of the Testing ¢ In order to prove that a formula or hypothesis is incorrect you have to show only one example. * To prove that a formula or hypothesis is correct any number of examples are insufficient. docsity.com Limitations of the Testing ¢ These examples only help you in coming up with as hypothesis but they are not proofs by themselves. ¢ They only enhance your comfort level in that particular hypothesis, i.e., in your piece of software. docsity.com Effective Software Testing docsity.com