CSE Study Material

Predicate Interpretation The simplest predicate depends only on input variables Example 1: If x1 and x2 are inputs, the predicate might be "x1 + x2 >= 7", given the values of x1 …

Predicates, Path Predicates and Achievable Paths Predicate: The logical function evaluated at a decision is called predicate The direction taken at a decision depends on the value of decision…

Loop Testing Time Any kind of loop can lead to long testing time, especially if all the extreme value cases are to be attempted (Max -1, Max, Max + 1) This situation is obviously worse for nes…

Control flow Graphs versus flowcharts A programs flow chart resembles a control flow graph In flow graphs, it is not necessary to show the details of what is in a process block In flow charts…

Control Flow Graphs The graphical representation of a program's control structure is known as control flow graph It uses the elements like process blocks, decisions and junctions The flow …

Bug Assumption The Bug Assumption for the path testing strategies is when something has gone wrong with the software that makes it take a different path than intended Example: "GOTO X" …

Requirements, Features and Functionality of Bugs Various categories in Requirements, Features and Functionality of Bugs include: Requirements and Specifications of Bugs: The Requi…

Taxonomy of Bugs There is no universally correct way to categorize bugs. The taxonomy is not rigid A given bug can be put into one or another category depending on its history and the progra…

Flexible Severity Rather Than Absolutes The combination of factors, of which number of bugs and their severity is treated as one component is used to measure the quality of a product Many organis…

Consequences of Bugs The consequences of a bug can be measured in terms of human, rather than machine, Some consequences of a bug on a scale of one to ten are: 1. Mild: The symptoms of the bu…

Importance of Bugs The importance of bugs on frequency, correction cost, installation cost, and consequences Frequency : How often does that kind of bug occur? Pay more attention to the more f…

The image shows a model of testing process It includes three models : A model of the environment, a model of the program and a model of the expected bugs Tests Tests are formal proc…

Testing vs Debugging  Function vs Structure  Designer vs Tester      Modularity vs Efficiecy     Small vs Large                Builder vs Buyer     Testing vs Debugging Many people …

Testing consumes atleast half of the time and work required to produce a functional program History reveals that even well written programs still have 1-3 bugs per hundred statements Producti…

Software Testing Methodologies Overview Software testing is the process of finding bugs or errors in a software The main reason for testing is to detect software failures, so that defects may …