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Introduction to Software Testing. Module Objectives. Introduction to Software Testing Importance of Software Testing Verification and Validation Software Test Lifecycle Testing Process. Goal of testing. The goal of a software tester is: To find bugs To find them as early as possible

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module objectives
Module Objectives

Introduction to Software Testing

Importance of Software Testing

Verification and Validation

Software Test Lifecycle

Testing Process

goal of testing
Goal of testing

The goal of a software tester is:

To find bugs

To find them as early as possible

& make sure they get fixed

Testing is a means to:

Find bugs

Provide confidence and information

Even prevent defects

why is testing needed
Why is testing needed

A defect in the software has a root cause, while the effect of defect is

seen as impact by the different stake holders.

Testing is part of overall Quality Assurance – It covers the Quality

Control aspect of ensuring Quality

A fault doesn't necessarily result in a failure, but a failure can only occur if a

fault exists. To avoid a failure you must find the fault.

Software testing may be required for compliance with contractual or legal requirements

When is testing complete?

Actually never

However for practical reasons it is stopped after considering the

risks involved, time and budget constraints

why is testing needed1
Why is testing needed

Why is testing needed

  • Complexity of software makes it error prone
  • Untested or weakly tested software can cause losses in real life. Eg:
  • Disney’s Lion King – 1994 – 1995- The software did not work on

the most common systems that the public had.

  • Intel Pentium Floating-Point Division Bug – 1994 – Intel took a

charge of more than $400 million to cover the costs of replacing

bad chips

  • NASA Mars Polar Lander – 1999 – Malfunction due to an

unexpected setting of a single data bit

  • Patriot missile defense system – 1991 – A software bug caused

the tracking system to be inaccurate after 14 hrs of operation

  • Software bugs can cause harm to a person, to the environment or to a

company

who makes a good tester
Who makes a Good tester

The tester’s mindset must have the below mentioned attributes

  • Keen Observation
  • Questioning Skills
  • “Never give-up” attitude
  • Interpersonal Skills
the v model
The V-Model

The V-model can be said to have

developed as a result of the evolution of

software testing. Various testing

techniques were defined and various kinds

of testing were clearly separated from

each other which led to the waterfall model

evolving into the V-model. The tests in the

ascending (Validation) hand are derived

directly from their design or requirements

counterparts in the descending

(Verification) hand. The ‘V’ can also stand

for the terms Verification and Validation.

the testing process

Project Initiation

Test Strategy and Planning

Test Environment setup

Test Case Designing

Test Execution

Test Cycles

Defect Reporting and Tracking

Project closure

The Testing Process
references
References
  • http://knol.google.com/k/istqb-certification-answers-of-all-tests-chapter-1-6#
  • http://9th-direction.com/ISTQB/ISTQB-Question-Paper-Dump-6.pdf
  • http://istqb.org/download/attachments/2326555/Foundation%20Level%20Syllabus%20(2010).pdf
  • http://istqb.patshala.com/