1. Software Engineering S o f t w a r e T e s t i n g Chapter 8
Dr.Doaa samy
Modified from Sommerville’s originals

2. Objectives  Understand the stages of development testing.2
 Understand the stages of development testing.
 Understand test-driven development.
 Know the important of release testing.
 Be aware of user testing processes and techniques.

3. Program Testing 3
 Testing is intended to show that a program does what it is intended to do and to discover program defects before it is put into use.
 Can reveal the presence of errors NOT their absence.
 Should be used in conjunction with inspection to provide full V&V coverage.

4.  A successful test is one that shows that a requirements
Type of Program Testing 4
 Validation testing
 Intended to show that the software meets it requirements.
 A successful test is one that shows that a requirements
has been properly implemented.
 If there is any variation in the test  Defect testing
 Tests designed to discover system defects.
 A successful defect test is one which reveals the presence
of defects in a system.

5. Validation vs. Verification5
 Validation:
 "Are we building the right product? ”
 The software should do what the user really requires.
 Verification:
 "Are we building the product right?”
 The software should conform to its specification.

6. V & V Goals and the type of use will determine the degree of6
 Aim of V&V is to establish confidence that the system is ‘fit for purpose’.
 This does not mean completely free of defects.
 Rather, it must be good enough for its intended use
and the type of use will determine the degree of
confidence that is needed.

7. Best wishes,