SWE 202 Chapter 7: Introduction to Software Testing

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Questions and Answers

What is the primary purpose of a Control Flow Graph (CFG)?

To visualize the user interface of a program

To describe the control structures of a program (correct)

To model the data structures of a program

To optimize the performance of a program

What is a Basic Block in a Control Flow Graph?

A sequence of statements with no branches (correct)

A single statement that controls the program flow

A sequence of statements with multiple branches

A group of statements that are never executed

What does an edge in a Control Flow Graph represent?

A program input

A transfer of control (correct)

A statement or sequence of statements

A data structure

What is the purpose of annotating a Control Flow Graph with extra information?

To provide additional context for testing Signup and view all the answers

What is the main difference between an if-else structure and an if structure without an else?

The presence of a default branch Signup and view all the answers

What is the primary application of Graph Coverage?

To test software specifications Signup and view all the answers

What is the chapter of the textbook that covers Graph Coverage?

Chapter 7 Signup and view all the answers

What is the name of the authors of the textbook 'Introduction to Software Testing'?

Paul Ammann and Jeff Offutt Signup and view all the answers

In a CFG, what is the purpose of adding 'extra' nodes?

To handle loops Signup and view all the answers

Which type of loop structure has an implicit initialization?

For loop Signup and view all the answers

What is the condition for the while loop to terminate?

x >= y Signup and view all the answers

What is the purpose of the return statement in a CFG?

To terminate the function Signup and view all the answers

What is the purpose of the dummy node in a CFG?

To handle loops Signup and view all the answers

In a CFG, what type of edges are not allowed?

Edges from node 2 to 3 Signup and view all the answers

What is the purpose of the incremental statement in a loop?

To increment the loop counter Signup and view all the answers

What is the difference between a do-while loop and a while loop?

The do-while loop checks the condition after the loop body Signup and view all the answers

What is the purpose of the print statement in a CFG?

To print the value of x Signup and view all the answers

What is the purpose of the function call in the loop body?

To perform some calculation Signup and view all the answers

Study Notes

Graph Coverage for Source Code

A control flow graph (CFG) models all executions of a program by describing control structures.
In a CFG, nodes represent statements or sequences of statements (basic blocks), and edges represent transfers of control.
A basic block is a sequence of statements where if the first statement is executed, all statements will be (no branches).
CFGs can be annotated with extra information.

Control Flow Graphs for if Statements

In an if-else structure, CFG nodes are created for each branch.
If there is no else clause, CFG nodes are still created to ensure proper control flow.

Control Flow Graphs for Loops

Loops require additional nodes to be added to the CFG, which do not represent statements or basic blocks.
In a while loop structure, a dummy node is added to ensure proper control flow.
For loop structures, nodes are implicitly created to handle initialization and incrementation.
Do-while loop structures also require additional nodes for proper control flow.

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Description

This quiz covers chapters 7.3-7.6 of the 2nd edition of 'Introduction to Software Testing' by Paul Ammann and Jeff Offutt, focusing on graph coverage. It's designed for the SWE 202 course.