1_introduction to software testing v2.0

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January 31, 2011 TCS Internal

Introduction to Software Testing


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Objectives

Introduction to Software Testing

Importance of Software Testing Verification and Validation

Software Test Lifecycle

Testing Process


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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


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January 31, 2011 4

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


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January 31, 2011 5

Why is testing neededWhy is testing needed

Complexity of software makes it error prone

Untested or weakly tested software can cause losses in real life. Eg:

Disneys 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


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Testing Profession


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Who makes a Good tester

The testers mindset must have the below mentioned attributes

Keen Observation

Questioning Skills

Never give-up attitude

Interpersonal Skills


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The V-Model

The V-model can be said to have

developed as a result of the evolution ofsoftware testing. Various testingtechniques were defined and various kindsof testing were clearly separated fromeach other which led to the waterfall modelevolving into the V-model. The tests in the

ascending (Validation) hand are deriveddirectly from their design or requirementscounterparts in the descending(Verification) hand. The V can also stand

for the terms Verification and Validation.


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SDLC and STLC


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The Testing Process

Project Initiation

Test Strategy and Planning

Test Environment setup

Test Case Designing

Test Execution

Defect Reporting and Tracking

Project closure

Test Cycles


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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/
http://knol.google.com/k/istqb-certification-answers-of-all-tests-chapter-1-6http://9th-direction.com/ISTQB/ISTQB-Question-Paper-Dump-6.pdfhttp://9th-direction.com/ISTQB/ISTQB-Question-Paper-Dump-6.pdfhttp://9th-direction.com/ISTQB/ISTQB-Question-Paper-Dump-6.pdfhttp://istqb.patshala.com/http://knol.google.com/k/istqb-certification-answers-of-all-tests-chapter-1-6http://9th-direction.com/ISTQB/ISTQB-Question-Paper-Dump-6.pdfhttp://9th-direction.com/ISTQB/ISTQB-Question-Paper-Dump-6.pdfhttp://knol.google.com/k/istqb-certification-answers-of-all-tests-chapter-1-6http://knol.google.com/k/istqb-certification-answers-of-all-tests-chapter-1-6http://istqb.patshala.com/http://9th-direction.com/ISTQB/ISTQB-Question-Paper-Dump-6.pdfhttp://9th-direction.com/ISTQB/ISTQB-Question-Paper-Dump-6.pdfhttp://9th-direction.com/ISTQB/ISTQB-Question-Paper-Dump-6.pdfhttp://9th-direction.com/ISTQB/ISTQB-Question-Paper-Dump-6.pdfhttp://9th-direction.com/ISTQB/ISTQB-Question-Paper-Dump-6.pdfhttp://9th-direction.com/ISTQB/ISTQB-Question-Paper-Dump-6.pdfhttp://9th-direction.com/ISTQB/ISTQB-Question-Paper-Dump-6.pdfhttp://9th-direction.com/ISTQB/ISTQB-Question-Paper-Dump-6.pdfhttp://9th-direction.com/ISTQB/ISTQB-Question-Paper-Dump-6.pdfhttp://9th-direction.com/ISTQB/ISTQB-Question-Paper-Dump-6.pdfhttp://9th-direction.com/ISTQB/ISTQB-Question-Paper-Dump-6.pdfhttp://9th-direction.com/ISTQB/ISTQB-Question-Paper-Dump-6.pdfhttp://9th-direction.com/ISTQB/ISTQB-Question-Paper-Dump-6.pdfhttp://9th-direction.com/ISTQB/ISTQB-Question-Paper-Dump-6.pdfhttp://knol.google.com/k/istqb-certification-answers-of-all-tests-chapter-1-6http://knol.google.com/k/istqb-certification-answers-of-all-tests-chapter-1-6http://knol.google.com/k/istqb-certification-answers-of-all-tests-chapter-1-6http://knol.google.com/k/istqb-certification-answers-of-all-tests-chapter-1-6http://knol.google.com/k/istqb-certification-answers-of-all-tests-chapter-1-6http://knol.google.com/k/istqb-certification-answers-of-all-tests-chapter-1-6http://knol.google.com/k/istqb-certification-answers-of-all-tests-chapter-1-6http://knol.google.com/k/istqb-certification-answers-of-all-tests-chapter-1-6http://knol.google.com/k/istqb-certification-answers-of-all-tests-chapter-1-6http://knol.google.com/k/istqb-certification-answers-of-all-tests-chapter-1-6http://knol.google.com/k/istqb-certification-answers-of-all-tests-chapter-1-6http://knol.google.com/k/istqb-certification-answers-of-all-tests-chapter-1-6http://knol.google.com/k/istqb-certification-answers-of-all-tests-chapter-1-6http://knol.google.com/k/istqb-certification-answers-of-all-tests-chapter-1-6http://knol.google.com/k/istqb-certification-answers-of-all-tests-chapter-1-6http://knol.google.com/k/istqb-certification-answers-of-all-tests-chapter-1-6http://knol.google.com/k/istqb-certification-answers-of-all-tests-chapter-1-6


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1_introduction to software testing v2.0

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