Software Testing & Quality

AssuranceLecture 1

Introduction to software testing

1

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.

2

Understanding software faults

Faults in software may cause:

Loss incurred by companies.

Loss of lives.

Loss of confidence of stakeholders

3

Sources of faults

Improper requirement engineering.

Flaws in design.

Inadequate testing.

Evolution of software: addition of new features may introduce new faults.

4

Software Testing

A process or set of activities to prove quality of software to stakeholders.

Verification and validation is part of testing.

5

Verification(product right)6

SOFTWARE X

X

FUNCTIONALITY

Validation (Right product)

Making sure software provide traceable requirements.

7

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.

8

Testing & confidence

Increase % bugs found, the higher is the confidence.

9

Standard Testing Activities

Model the environment.

Select test scenarios.

Test and evaluate.

Measure testing progress.

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