1. Software Testing & Quality
1
Assurance
Lecture 1
Introduction to software testing

2. 2 Outcomes:
 Understanding the concept of software faults.
 Some sources of software faults including examples.
 Definition of software testing including verification and validation.
 Some main principles of software testing.
 Why to test?
 Testing Activities.

3. 3 Understanding software faults
 Faults in software may cause:
 Loss incurred by companies.
 Loss of lives.
 Loss of confidence of stakeholders

4. 4 Sources of faults
 Improper requirement engineering.
 Flaws in design.
 Inadequate testing.
 Evolution of software: addition of new features may introduce new faults.

5. 5 Software Testing
 A process or set of activities to prove quality of software to stakeholders.
 Verification and validation is part of testing.

6. 6 Verification(product right)
X
SOFTWARE X FUNCTIONALITY

7. 7 Validation (Right product)
 Making sure software provide traceable requirements.

8. 8 Principles
 Good test case helps to find bugs.
 Successful test helps to find undiscovered errors.
 Testing is destructive and is followed by debugging.
 Testing cannot find all defects.

9. 9 Testing & confidence
 Increase % bugs found, the higher is the confidence.

10. 10 Standard Testing Activities
 Model the environment.
 Select test scenarios.
 Test and evaluate.
 Measure testing progress.