Techniques in black box testing

Techniques in Black Box TestingTechniques in Black Box TestingPresenter: Le Thuy Linh

Agenda

� About A.N.S Asia and About Me

� Techniques in Black Box Testing

� Discussions

About A.N.S Asia

� 100% subsidiary of ANS Japan

� Address : 10F CMC Tower, Duy Tan Street

� Foundation: 10/2012� Foundation: 10/2012

� Business functions: Software development and IT consulting,…

About Me

� My Name: Le Thuy Linh

� Current position: Tester

� Interesting in: Travelling, Listening Music... Music...

Methods in Testing

I/P O/P

� Black Box Testing

� White Box Testing

Techniques

� Equivalence Partitioning

� Boundary-value Analysis

� Cause – effect graphic testing

� State transition testing� State transition testing

� ....

Equivalence Partitioning

� Equivalence partitioning is based on the premise that the inputs of a component can be partitioned into classes

� The result of testing a single value from an equivalence partition is considered representative of the complete partition.

Equivalence Partitioning

Determine equivalence classes:

� a<x<b

� True/False

� {a,b,c,..}

Boundary Value Analysis (BVA) is a test Functional Testing technique where the extreme boundary values are chosen.

� Standard BVA

� Robustness testing

� Standard BVA

Boundary values include: Min, Min+, Mom, Max-, Max

Test cases : 4n+1

BVA - Standard

Test cases : 4n+1

– 4: values( min,min+, max, max-)

– n: number of variables

– 1: mom

� Robustness testing:

Boundary values include : Min, Min+, Mom, Max, Max, Min-, Max+

Test cases: 6n+1.

BVA - Robustness

Test cases: 6n+1.

– 6: values(min-, min,min+, max-, max,max+)

– n: number of variables

– 1: mom

� Cause Effect Graph is a black box testing

technique that graphically illustrates the

relationship between a given outcome and

all the factors that influence the outcome.

Cause –effect graphic

all the factors that influence the outcome.

Cause – effect graphic

� Step 1: Identify the causes and the effects

� Step 2: Establish the graph of relations between causes and effects

�� Step 3: Complete the graph by adding constraints between causes and effects

� Step 4: Convert the graph to a decision table

� Step 5: Generate a test cases

A system of car insurance premiums:

� Sex is Female and Age is < 65, Premium is 500$

� Sex is Male and Age is < 25, Premium is

Example

� Sex is Male and Age is < 25, Premium is 3000$

� Sex is Male and Age is => 25 and <65, Premium is 1000$

� Age is => 65, Premium is 1500$

Establish the graph of relations between causes and effects

Step 2

Complete the graph by adding constraints between causes and effects

Example – Step 3

Example – Step 4

Example – Step 5

State transition testing

State transition technique is a dynamic testing technique, which is used when the system is defined in terms of a finite number of states and the transitions between the states is governed by the rules of the system.

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State –Transition diagram

State -Transition Tables

Test Case

ThanksThanks

Techniques in black box testing

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Transcript of Techniques in black box testing

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