# What is Boundary value analysis and Equivalence partitioning?

Boundary value analysis and Equivalence partitioning, explained with simple example:

Boundary value analysis and equivalence partitioning both are test case design strategies in black box testing.

Equivalence Partitioning:

In this method the input domain data is divided into different equivalence data classes. This method is typically used to reduce the total number of test cases to a finite set of testable test cases, still covering maximum requirements.

In short it is the process of taking all possible test cases and placing them into classes. One test value is picked from each class while testing.

E.g.: If you are testing for an input box accepting numbers from 1 to 1000 then there is no use in writing thousand test cases for all 1000 valid input numbers plus other test cases for invalid data.

Using equivalence partitioning method above test cases can be divided into three sets of input data called as classes. Each test case is a representative of respective class.

So in above example we can divide our test cases into three equivalence classes of some valid and invalid inputs.

Test cases for input box accepting numbers between 1 and 1000 using Equivalence Partitioning:
1) One input data class with all valid inputs. Pick a single value from range 1 to 1000 as a valid test case. If you select other values between 1 and 1000 then result is going to be same. So one test case for valid input data should be sufficient.

2) Input data class with all values below lower limit. I.e. any value below 1, as a invalid input data test case.

3) Input data with any value greater than 1000 to represent third invalid input class.

So using equivalence partitioning you have categorized all possible test cases into three classes. Test cases with other values from any class should give you the same result.

------------

We have selected one representative from every input class to design our test cases. Test case values are selected in such a way that largest number of attributes of equivalence class can be exercised.

Equivalence partitioning uses fewest test cases to cover maximum requirements.

Boundary value analysis:

It’s widely recognized that input values at the extreme ends of input domain cause more errors in system. More application errors occur at the boundaries of input domain. ‘Boundary value analysis’ testing technique is used to identify errors at boundaries rather than finding those exist in center of input domain.

Boundary value analysis is a next part of Equivalence partitioning for designing test cases where test cases are selected at the edges of the equivalence classes.

Test cases for input box accepting numbers between 1 and 1000 using Boundary value analysis:
1) Test cases with test data exactly as the input boundaries of input domain i.e. values 1 and 1000 in our case.

2) Test data with values just below the extreme edges of input domains i.e. values 0 and 999.

3) Test data with values just above the extreme edges of input domain i.e. values 2 and 1001.

Boundary value analysis is often called as a part of stress and negative testing.

Note: There is no hard-and-fast rule to test only one value from each equivalence class you created for input domains. You can select multiple valid and invalid values from each equivalence class according to your needs and previous judgments.

E.g. if you divided 1 to 1000 input values in valid data equivalence class, then you can select test case values like: 1, 11, 100, 950 etc. Same case for other test cases having invalid data classes.

This should be a very basic and simple example to understand the Boundary value analysis and Equivalence partitioning concept.

#1 Beena

Nice…
Thanx….

#2 lAKSHMI

Hi ,
Thanks for updating me.

Can u please hepl me about the certification in Testing as i planning to write.

First i need what is the Use of this certifications

#3 sathish

Greate article……

Thank u….

#4 Deepa

hi vijay,

It’s a very good article. Thanks for sharing knowledge.

Regards,
Deepa

#5 kishore

I would like to add one formulae here for boundary value.
n, n+1, n-1 one can use this formulae to calculate BV. It can be used for min and max value. As in the above example. 1-1000
BV= 1,2,0 and 1000,1001,999

Regards
kishore

#6 dhinesh

Very good explanations

dhinesh
grdhinesh@gmail.com

This kind of Articles helps every one. Good Work.

#8 rakesh

hi friends can anybody explain about traceability in detail with detail,,matrix

#9 rakesh

hi friends can anybody explain about traceability matrix in detail with example

Hi Vijay,

Thanks to Sharing knowledge

Regards

Hi Friends ,

Can anybody tell me For I.s.t.Q.B Certification and is it indispensible condition to have atleast 2 yr. exp. in mannual My mail is is :-
Er4testing@yahoo.com

Regards

#12 Mohit Verma

Hi!

Nice Way to explain with simple example. Keep the good work coming.

#13 Senthil

Why we have to methods to test the same condition.. Is it intenstional ?

#14 kishore

Senthil

Using Equivalence partition:
you can divide input data into different class as valid and invalid class
eg: 1-1000
valid class-1-1000
Invalid class-less than 1
invalid class-more than 1000

Using BV: now using the above class you write your test cases on boundaries. you can use above formulae posted in my comment to find the boundary values for diffrenet classes.

Both the techniques are used simultaneously to design test case.
First you divide your input data into valid and invalid class using Equivalence partioning and

Second use boundary value to decide on the boundaries of each class.

Regards
kishore

#15 Ganesh.p

Hi to every one,

This kind of articles help in Testing and

we must share the real time experience also

so i preparing that one as soon as i share to everyone

thanks

good luck to everyone

Be prepare for coming time in IT

Great!!! Simple, precise & accurate way of making others to understand the concepts… Thanks

#17 Suhas M

Good writing Vijay !!!
But, I have a doubt here. When you apply the equivalence class partitioning for the input in the above example you have had 3 partitions – within the limit, above upper limit and below lower limit. Now my question is – is this equivalence class partitioning limited to this, if thats the case then i dont see there is much difference in EP and BVA. If you apply BVA, EP is autometically applied.
Hope I am not very incorrect in my understanding, your views on this please.

Regards, Suhas M

#18 Suhas M

@Kishore,

Do we apply the BVA for all the classes i.e valid class as well as invalid class? Or is it enough to apply the BVA for valid class only. It would be great if you could explain this with an example.

Regards, Suhas M.

#19 G.Mallikarjun

Hello,

What a beautiful explanation.

#20 Sreenivasa Rao

Cld anybody pls help me in answering the following question – how many test cases will be generated for three check boxes and one button

#21 kishore

Suhas
Nice thought!!
As per my knowledge we can use BVA for both the classes.
For eg: If I consider 5-50 a range then my
valid class: 5-50
invalid class: lets say =49.99 also we use the same technique.

#22 kishore

Suhas
Nice thought!!
As per my knowledge we can use BVA for both the classes.
For eg: If I consider 5-50 a range then my
valid class: 5-50
invalid class: lets say (less than =4.99) and
other invalid class would be (greater than=49.99 )
Instead of writing test cases on all the values we can use BVA to minimise the no of test cases.

#23 shekhar rai

thanks
its very nice

#24 life99joy

Said nicely and simple. I’d like to add one more check (I was asked that in the interview) – would probably be a good idea to check the values somewhere in the middle. Let’s say if we’re testing values 1 to 100,000 we should also look into 1,000; 10,000, ect.

#25 Suhas M

@Kishore
I am not clear yet, :(
For a valid range of input – if you apply BVA, its simililar to EP. So why do we need to apply EP and then BVA, because if you directly apply BVA to the above example it goes well.

I would like to explain what I have understood by BVA and EP by slightly modifying the above example.

Lets say a system accepts the input as number that ranges form 100-100000 or alphabetical/alphanumeric input with 3-6 char.
Now my classes will be
1.Only numbers.
2.Only alphabets.
3.Alphanumeric.
4.Numbers with special characters.
5.Alphabets with special characters.
6.Alphanumeric with special characters.
Out of this if you apply BVA for 1,2 and 3 its good enough.

Let me know if my understanding is correct. If you think I am wrong helpme understanding with explaining your views with my example.

Regards, Suhas M.

#26 kishore

Suhas
Consider below example
Suppose my valid class is 10-100
If I am asked to write test cases, I would apply BVA to this class to minimize my number of test cases. Otherwise it would go from 10 to 100
Using BVA my test cases have reduced to SIX. Three for min value and three for max value.

9,10,11 and 99,100,101

Regards
kishore

#27 Suhas M

@Kishor,
I completly agree with what you say about BVA, now for the input set 10-100 how would you apply EP ?
PS: My question is more to do with EP in the above example given by Vijay.

Hey Vijay, could you throw some light on this as well? Some how am getting a feel that the EP what you have explained is either incomplete or you have not have not explained it with a very good example.

Regards, Suhas M

#28 kishore

Excellent brainstorming session Suhas
Well put it simple
Use ECP to divide input domain into equivalent class as you pointed out in your example and then use BVA to decide test cases on extreme edges.

#29 sharan

very nice article about BVA and EP

regards,
Sharan

#30 Qastation

Hi Vijay

Candid to the comments does it really works. Since if you take a text box of 1 -1000 characters, then will it possible to execute without entering 1000 characters at an instant to verify whether it allow or not. If system allows then what’s the necessity to go for in between values (Equivalence Partitioning) since it allows all the 1000.

Is am byte confused here……? Can you please clear my doubt?

Also does really a Test Engineer use this strategy to prepare test cases for Black Box Testing?

#31 Munna bhai

Thanx

#32 rao

TQ

#33 Deepak

Hi, Vijay this is a great site. Good job. Can u mail me the software testing by ron patton ebook to rockys283@yahoo.co.in

Thanks and Regards

#34 anusha

hai

can any body tell me the QTP life cycle all phases to me
more examples on manual test cases
give me some requirements to write test cases

sujani_2008@yahoo.com

#35 Sreenivasa Rao

Could anybody pls help me in answering the following question – how many test cases will be generated for three check boxes and one button which was questioned me in an interview.

#36 Sreedhar

Srinivasa Rao,
for 3 check boxes and one button – 8 test cases can be written. BTW, button was only to confuse but all 8 test cases are the possible selection of 3 check boxes.

Hope this helps. But I don’t understand why you were asking that question here in the comment section of BVA article.

#38 Sreenivasa Rao

Sorry, Sreedhar for posting the question in the comment section of BVA. Thanks for the answer.

#39 Inder P Singh

It is believed that EP is a good technique to reduce the number of test cases to a bare minimum. Though EP is related to efficiency of test case design, I think that we should be aware that using EP could prevent the discovery of defects related to particular data value(s) in a range. Consider a date input text box (with a calendar control) that accepts dates between 1 Jan 1970 and today. We have three classes (also called partitions) here
1) = 7 Nov 2008.
By just selecting one test data value from each class might not be able to exercise the application with other interesting values e.g. 29 Feb 2008 or any particular value not handled correctly by the application.

#40 Inder P Singh

Part of my comment has gone missing when posted. Therefore, I am posting my comment again:

It is believed that EP is a good technique to reduce the number of test cases to a bare minimum. Though EP is related to efficiency of test case design, I think that we should be aware that using EP could prevent the discovery of defects related to particular data value(s) in a range. Consider a date input text box (with a calendar control) that accepts dates between 1 Jan 1970 and today. We have three classes (also called partitions) here:
Less than or equal to 31 Dec 1969, 1 Jan 1970 to 6 Nov 2008, greater than or equal to 7 Nov 2008.

By just selecting one test data value from each class might not be able to exercise the application with other interesting values e.g. 29 Feb 2008 or any particular value not handled correctly by the application.

Inder P Singh

#41 Tanvi

Hi Vijay

I din’t know where to put this question because there is no category for that.

Can you help me with ways of testing an artificial intelligence software/product

thanks Tanvi

Good topic. It is very user full…..why cont you explain about estimation concept in testing

Thanks

HP

#43 mrunalini

this is a great article.

can anybody mail me the software testing ebook.
my mail id: oasisuser4@gmail.com

#44 Sirisha

Respected seniors, Vijay plz. answer me.

How to answer – “what METRICS do you use? How many types of metrics are there?” It’s a most imp question in interviews. As far as i know, different metrics are–Defect Density, Defect Leakage, Traceability Matrix, Bug Trend Analysis(means comparing no of bugs in different versions). Types of Metrics are Process, Product, Project. “Do CMM, ISO 9000 come under Metrics?”. I am not concluding the above information. My attempt is to make clear that on what topic seniors have to give their kind and valuable suggestions.

Plz. respond with full details.

Yours faithfully………Sirisha

#45 swapna

actually, how many types of “Test Reports” are there?

i came through different terminology like—

Test summary reports
Test execution reports
Test status reports
Test log reports
Test daily, weekly reports

These all mean same??? if not please explain me and also explain me if there are any other reports that come under above list. in the least case please provide me exact link. Thanks in advance.

#46 Qastation

@Sirisha

Types of Metrics:
Process & Product/Project (depends upon application)

Under process metrics: Evaluates the efficiency of the process you use for your production (Project)

Effort, Schedule, Quality (DRE)

Product/Project:

Can have DRE also here, Phasewise defect removal, defect density and etc.

….mm Tracability Matrix is used for trace the requirements. It’s an verification techniques, not metric.

#47 Qastation

@Swapna

All the above mentioned reports are of same.
It depends upon the organisation requirements they will name it as they are.

#48 Asawari

Hi,

very useful article written in simple way so that any one can understand it easily.

Thanks…..

But I think very less topics are covered….Plz write more topics on testing….It will be very helpfull to us…..

#49 BAO

GUYS and GALS,
from what i see in the article BVA and EP just different method of testing. Use either one.

Now can anyone help me in this scenario

i have 2 textboxes or fields, and
One can be entered with only alphabet
another can be entered with only number

so how can i use BVA on this scenario

won’t there be too many scenario?
such
– leading space i.e. ” hello”
– blank
– symbol

Can someone post all the scenario?

Greatly appreciated..

#50 Venkata Srikanth

@LAKSHMI

Hi Lakshmi,

If u do the certification in Testing that will give good weightage to ur Resume.

Suppose if any organization is following RUP model those organizations will give more importance to Certified Test Engineers.

If u r intrested to do certification in S/w Testing u can mail me at srikanthvelivela@gmail.com for further details.

#51 Daiju

In BVA, we are taking the values from the edges of the classes and write the test cases. But in EP, We are taking the value from each classes and write the test cases.

#52 Ashish Singh

Dear BAO,

U can try out by permutation for both fields.
Am I right all there?

#53 Rashmi

hi,

In order to test for a text box that excepts amount in the range 1 to 100 we need to test for the following condition:

1. First see if the text box accepts alphabets
2. second whether it accepts special characters
3. Then enter “2e4” in some cases it allows this and converts to exponent which should not be allowed
4. then go for BVA
i.e enter 0,1,2 and 99,100,101

Dont u think this is the approach that needs to be followed.

#54 GIRISH

dear lakshmi,

your approach is correct,use some more combinations like alphanumeric+specialcharacters and
alphabets+small letters+numericals+special characters.

#55 GIRISH

hey sorry,rashmi.

#56 raj

can you tell me Installation Testing….!

#57 GIRISH

hi raj,

Installation testing should be done in the collabartion with the configuration engineer.
installation is the process which first time client/user is going to interacted with our product/appl.
installation testing is done to ensure that the client/user do not feel trouble while installing the software.
thank you

#58 diya

hi,
what is statement coverage and branch coverage? could you explain with examples.
thanks

#59 Sureshkumar

Guys,

In a system designed to work out the tax to be paid: An employee has £4000 of salary tax free. The next £1500 is taxed at 10% The next £28000 is taxed at 22% Any further amount is taxed at 40% To the nearest whole pound, which of these is a valid Boundary Value Analysis test case? a) £1500 b) £32001 c) £33501 d) £28000

#60 Sreedhar

Option C is correct. Valid values for the above scenario will be -1,0,1,3999,4000, 4001, 5499,5500, 5501, 33499,33500,33501.

#61 Sureshkumar

Exactly u r correct Sreedhar…Thanks for reply

1500+28000+4000 = 33500 +1 is 33501(last boundry)

#62 Kruti

hi…very nice article with good explanation with simple examples in simple language, so that every one can understand it easily.

#63 rajesh

it very nice article to get the knowledge of boundary value analysis and equal partitioning….great work

#64 Karuna

its very good n useful…
thanks very much..

#65 Suresh Rathod

It’s a very nice article. Thanks for sharing knowledge.

#66 Bithika

Hi,

I have 4 yrs of experience in manual testing. Which certification will help me to shape up my career graph.

regards
Bithika

#67 shivanand

#68 G.suresh

Hi

It’s good sharing your knowledge with others about equivalence and boundary value analysis, but I am having one doubt, you have taken the example for only single instance what will happen if there are multiple instances? Its take time and somewhat difficult to do that. Recently I have seen a tool called “TestersDesk.com” Which is useful for both TestDesign and TestData Generation Toolkit in that Boundary value analysis tool is there with the help of tool we can reduce our work and can do for multiple instances at the same time

#69 ch.girishchander raju

hi bithika,

you can go for ISTQB(foundation level) first.After
that you can go for Advanced level.Tthen u can be called as ISTQB certified functional tester/technical tester.
Thank u

cheers,

CH.GIRISH CHANDER RAJU
CERTIFIED TEST ENGINEER

#70 varma

Hi
Can anyone explain me the process of Business Testing

#71 SAchin

Thanks man
its really good.I can suggest to give some more examples so that people can understand in a better way! :)

#72 Yays:D

Nice concise explanations and examples of EP and BV – makes my revision a lot easier! Cheers! :D

#73 Veni

Its very nice article which is explained in simple words so that every one can understand. Nice work Ajay!! Thanks for sharing this gr8 article..Keep it up!!

#74 Anurag Srivastava

Great work VIJAY!!

I really appreciate ur work and all those who have posted their comments

#75 XXX

Its very nice article

#76 SUHASINI

Hi All,

Could anyone please give me a justifying answer for wat suhas has askd on the efficiency of Equivalence partitioning over BVA? Because as he said, BVA is going to cover all of the scenarios including what we are trying to cover in EP. Please let me know with a clear example.

#77 Srikumaran

BVA is something it covers the valid and invalid class of EP.

For ex: 60 – 120
for equivalance partitioning we go by the value
59 60 61 119 120 121
59.9 60 60.1 70 119.9 120 120.1
In case of value 59 is a invalid class, similarly 121 is an invalid class.

Could anyone clear me if i am wrong?

#78 david

I think this misses the heart of equivalence class partitioning. A number range does not offer a good opportunity to describe equivalence classes because 1-1000 everything is equivalent. One can only understand the technique when some are not equivalent.

Let’s say one is testing an eCommerce application and there’s a drop-down for selecting the state. Some states have no tax, others have tax, and some the company cannot ship to. Equicalence class partitioning might lead you to choose at least one state each from:
0 tax + can ship
0 tax + cannot ship
>0tax + can ship
>0tax + cannot ship

0 tax and >0 tax are different because they have different semantics to the app. 5% tax and 6% tax yield different results but you expect the behavior to be similar (tax amt. should be tax % * taxable total) and testing every possible combo 5%, 5.5%, 6%, etc. might not be practical.

As always, go back to the classics. Glenford Myers “the art of software testing” is a good resource.

#79 oracleeye

hi every1,
thnaks to all because of you guys I come to know the new terms which i never heard.. thank you very much

#80 oracleeye

especially to susma

#81 andrew hudson

this is a nice explaination with a neat example.

#82 inder

thanks for giving an important info about boundary value analysis.

#83 Sumesh

Nice example

#84 amol

very good…..
thanks!

#85 kushal

How can we made equivalence partioning for a field where date is the input like 1 Jan 1976 to 5 Nvoember 2009?
What would be the Equivalence classes…consder the leap years also

#86 Balaji

Good article and comments with nice examples. Thanx.

#87 Sonali

Thnx…its a nice example

#88 prashanth

Can anyone explain me the process of Avinoncs software Testing

#89 Mohan

Good stuff!!!!!! Please keep doing :-)

#90 SWTester

Check the link. You can have a detailed idea about how and why this practice has been adopted!

BVA Formula :

n-1, n, n+1

Ex: 1 – 1000 find BVA for this

0,1,2, 999,1000,1001 (is valid BVA for)

#92 prashanth

hi friend

Anser to Tracebility matrix : Tacebility matrix a document which track the completeness. e.g. Requirement Tracebility Matrics(RTM). In RTM we note down all the requirements id which are there in SRS. As and when we start writing test cases againist requirements, we keep updating those test cases id in RTM against respective requirements.

Hope this short description will help you to understand about Tracebility matrics. gook luck , happy testing.

#94 ankush

for the above example its very simple n easy to get the ecp n bva..
fr ecp we use the grouping its no possible to take every test case so..
Ecp=1-3000-1000 i take min value and then aby midle value and then max value

and Bva is for -negative approach is
min-1=1-1=0
max=1=1000+1=1001
for +ve approach its same min=1 and max=1000

#95 Shaun

One point to add to this article is the concept that granularity matters in boundary testing. In the example provided their is an assumption that only whole numbers are permitted, but what if decimals were allowed? If we could input 1.0 to 1000.0 then the granularity of the boundary condition changes. It is no longer valid to simply say the boundaries are min-1, min, min+1, max-1, max, max+1. In this example we have to go down to the 1/10ths to adequately test the boundary condition (0 isn’t sufficient for min-1, but .9 is).

Granularity becomes even more important when we consider boundary conditions related to dates and times. If I need to test for a condition where AGE > 65 years is my max+1 boundary condition 66 years, 65 years and 1 day, 65 years and 1 hour, 65 years and 1 minute, etc?

When we test for boundary conditions we must ALWAYS consider and understand the granularity of the boundary condition in order to provide a valid boundary test.

#96 AG

Here is another nice example on
equivalence partitioning

BVA Formula: min, min+1, min-1,
max, max+1, max-1

ECP: Valid and Invalid will be there in ECP

#98 Shiva

Good one!

#99 Shiva kumar

God bless you, thanks for the information, i got 6 years of exp, still i could learn some thing from you ….

#100 sheetal

great article .thank u.

#101 Jyothsna

Very good article..I have understood the topic after many days!!!Thanks a lot.

#102 Priyanka

Very well written.

#103 Jaya

All r telling about how to write test cases for numerics,alphabets and for spl char.s or mixed of 3.
I have a doubt, that is, bva on pages can be done by manually?

#104 Murali

Jaya, the concept of BVA is to design the test cases to test extremes of input domain i.e. min, max values so this cannot be used to page testing

#105 Manjunath

Good concept and keep posting

#106 Bhakti

Hey..

Very nice one.. Thanks..

Bhakti

#107 brahma

hi,

i want some information about ISTQB, can u tell me some examples.

#108 sharath sistla

hi,

nice article

#109 Pawan J

Nice Article….. Thanks

#110 anitha

Thanks for explaining in simple way

#111 Hanumant Sharma

In practical , while we test for a particular requirement, one have to test 1st from the middle , its the last step of completeion of testing when we use BVA.,

#112 ealshabaan

really good

#113 Amol Gangurde Pune

Thanks…..

what is BVA for the 0-10 range

#115 Umar

Excellent post. Easy to understand the two concepts. Thanks for sharing.

#116 kuttty

what is boundary analaysis ?

#117 Hafiz Rizwan Iqbal

Really !!!! nice one..

Impressive writing

#118 JAJA

Thanks a lot for the explanation and the simple example.

#119 Ramkumar

Thanz its v useful to update ……

#120 Ramkumar

if u have any test case samples…. send me

#121 Girijesh

Hi,

its a nice article helped a lot in my understanding.

#122 mani

i am fresher in testing supposose how can i start the testing?
which domain will be best?
send me my mail

#123 lalu

Please let me know EP and BVA for below
A-Z, a-z

#124 muralimohanreddy

Hi friends

good stuff

#125 Vetri R

Thanks for making me to understand the concepts…. very cool explanation

#126 Rajaguru

Good Explanation. Cheers, Guru

#127 Rajaguru

Hello Friends,

Could you explain, How to apply BVT for Date and Time fields?

Cheers,
Guru

#128 Priya

really useful… thanks

#129 Sandeep

Good subject details on EP(Equivalence Partitioning) & BVA(Boundary Value Analysis)

#130 prabhu

This is really useful… Thanks… thanks a lot

#131 Indrajit

thnx & very hlpful

#132 Alpha

thanks alot, its help me to understand the difference between equivalence and boundary value analysis

#133 saravanan

hi guys this forum is really helpful thanks for sharing u r knowledge in this forum :)

#134 Arokya Samy

Hi friends… I have one plus experience in Testing field…
pls mail me if u know any openings….

#135 Jitendra Bhande

for istqb preparation BVA AND EP must fix Your some marks…nice article….

#136 Rupal

Order numbers on a stock control system can range between 10000 and 99999 inclusive. Which of the following inputs might be a result of designing tests for only valid equivalence classes and valid boundaries:
1000, 5000, 99999
9999, 50000, 100000
10000, 50000, 9999
10000, 99999
which is correct?

#137 Rupal

given the following specification.
which of the following value for age are in the same EP
if uor age less than 18 then too young for insurance
if 18 to 30 then 20% discount
more then 30 ,not eligible for discount

17,18,19
29,30,31
18,29,30
17,29,31

#138 vijetha

I wrote the answers for the questions which i got.I dont know the correct answers.As per my knowledge I gave answers.Plz correct me with good explanation for wrong answers.
1) Order numbers on a stock control system can range between 10000 and 99999 inclusive. Which of the following inputs might

be a result of designing tests for only valid equivalence classes and valid boundaries:
a) 1000, 5000, 99999
b) 9999, 50000, 100000
c) 10000, 50000, 99999
d) 10000, 99999
e) 9999, 10000, 50000, 99999, 10000 ANS-C

2) Which of the following is NOT a black box technique:
a) Equivalence partitioning
b) State transition testing
c) Syntax testing
d) Boundary value analysis ANS-C

3) Error guessing is best used
a) As the first approach to deriving test cases
b) After more formal techniques have been applied
c) By inexperienced testers
d) After the system has gone live
e) Only by end users ANS-B

4) Which is not true-The black box tester
a. should be able to understand a functional specification or requirements document
b. should be able to understand the source code.
c. is highly motivated to find faults
d. is creative to find the system’s weaknesses. ans-B

5) A test design technique is
a. a process for selecting test cases
b. a process for determining expected outputs
c. a way to measure the quality of software
d. a way to measure in a test plan what has to be ans-Cdone

6) Which of the following is true?
a. Component testing should be black box, system testing should be white box.
b. if u find a lot of bugs in testing, you should not be very confident about the quality of software
c. the fewer bugs you find, the better your testing was
d. the more tests you run, the more bugs you will find. ANS-D

7) What is the important criterion in deciding what testing technique to use?
a. how well you know a particular technique
b. the objective of the test
c. how appropriate the technique is for testing the application
d. whether there is a tool to support the technique ANS-C

8) Which of the following is a black box design technique?
a. statement testing
b. equivalence partitioning
c. error- guessing
d. usability testing ANS-B

9) A program validates a numeric field as follows:
values less than 10 are rejected, values between 10 and 21 are accepted, values greater than or equal to 22 are rejected
Which of the following input values cover all of the equivalence partitions?
a. 10, 11, 21
b. 3, 20, 21
c. 3, 10, 22
d. 10, 21, 22 ANS-B

10) Using the same specifications as question 9, which of the following covers the MOST boundary values?
a. 9,10,11,22
b. 9,10,21,22
c. 10,11,21,22
d. 10,11,20,21 ANS-B

11) Error guessing:
a) supplements formal test design techniques.
b) can only be used in component, integration and system testing.
c) is only performed in user acceptance testing.
d) is not repeatable and should not be used. ANS-A

12) Which of the following is NOT a white box technique?
a) Statement testing
b) Path testing
c) Data flow testing
d) State transition testing ANS-D

13) Data flow analysis studies:
a) possible communications bottlenecks in a program.
b) the rate of change of data values as a program executes.
c) the use of data on paths through the code.
d) the intrinsic complexity of the code. ANS-C

14) In a system designed to work out the tax to be paid:
An employee has £4000 of salary tax free. The next £1500 is taxed at 10%
The next £28000 is taxed at 22%
Any further amount is taxed at 40%
Which of these groups of numbers would fall into the same equivalence class?
a) £4800; £14000; £28000
b) £5200; £5500; £28000
c) £28001; £32000; £35000
d) £5800; £28000; £32000 ANS-D

15) Test cases are designed during:
a) test recording.
b) test planning.
c) test configuration.
d) test specification. ANS-D

16) An input field takes the year of birth between 1900 and 2004
The boundary values for testing this field are
a. 0,1900,2004,2005
b. 1900, 2004
c. 1899,1900,2004,2005
d. 1899, 1900, 1901,2003,2004,2005 ANS-C

17) Boundary value testing
a. Is the same as equivalence partitioning tests?
b. Test boundary conditions on, below and above the edges of input and output equivalence classes
c. Tests combinations of input circumstances
d. Is used in white box testing strategy ANS-B

18) When testing a grade calculation system, a tester determines that all scores from 90 to 100 will yield a grade of A, but

scores below 90 will not. This analysis is known as:
a) Equivalence partitioning
b) Boundary value analysis
c) Decision table
d) Hybrid analysis ANS-B

19) Which technique can be used to achieve input and output coverage? It can be applied to human input, input via interfaces

to a system, or interface parameters in integration testing.
a) Error Guessing
b) Boundary Value Analysis
c) Decision Table testing
d) Equivalence partitioning ANS-A

20) Features to be tested, approach, item pass/fail criteria and test deliverables should be specified in which document?
a) Test case specification
b) Test procedure specification
c) Test plan
d) Test design specification ANS-A

21) Which specification-based testing techniques are most closely related to each other?
a) Decision tables and state transition testing
b) Equivalence partitioning and state transition testing
c) Decision tables and boundary value analysis
d) Equivalence partitioning and boundary value ANS-D
analysis

22) assume postal rates for ‘light letters’ are:
\$0.25 up to 10 grams
\$0.35 up to 50 grams
\$0.45 up to 75 grams
\$0.55 up to 100 grams
Which test inputs (in grams) would be selected using boundary value analysis?
a) 0, 9, 19, 49, 50, 74, 75, 99, 100
b) 10, 50, 75, 100, 250, 1000
c) 0, 1, 10, 11, 50, 51, 75, 76, 100, 101 ANS-C
d) 25, 26, 35, 36, 45, 46, 55, 56

23) If the temperature falls below 18 degrees, the heating system is switched on. When the temperature reaches 21 degrees,

the heating system is switched off. What is the minimum set of test input values to cover all valid equivalence partitions?
a) 15, 19 and 25 degrees
b) 17, 18, 20 and 21 degrees
c) 18, 20 and 22 degrees
d) 16 and 26 degrees ANS-A

24) What is a test condition?
a) An input, expected outcome, precondition and post condition
b) The steps to be taken to get the system to a given point
c) Something that can be tested
d) A specific state of the software, ex: before a test can be run ANS-D

25) What is a key characteristic of specification-based testing techniques?
a) Tests are derived from information about how the software is constructed
b) Tests are derived from models (formal or informal) that specify the problem to be solved by the software or its components
c) Tests are derived based on the skills and experience of the tester
d) Tests are derived from the extent of the coverage of structural elements of the system or components ANS-A

26) Why are both specification-based and structure-based testing techniques useful?
a) They find different types of defect.
b) using more techniques is always better
c) both find the same types of defect.
d) Because specifications tend to be unstructured ANS-D

27) Find the Equivalence class for the following test case
Enter a number to test the validity of being accepting the numbers between 1 and
99
a) All numbers 99
c) Number = 0
d) All numbers between 1 and 99 ANS-D

28) What is the relationship between equivalence partitioning and boundary
value analysis techniques?
a) Structural testing
b) Opaque testing
c) Compatibility testing ANS-B
d) All of the above

29) Suggest an alternative for requirement traceability matrix
a) Test Coverage matrix
b) Average defect aging
c) Test Effectiveness
d) Error discovery rate ANS-A

30) The following defines the statement of what the tester is expected to accomplish or validate during testing activity
a) Test scope
b) Test objective
c) Test environment
d) None of the above ANS-B

31) One technique of Black Box testing is Equivalence Partitioning. In a program
statement that accepts only one choice from among 10 possible choices,
numbered 1 through 10, the middle partition would be from _____ to _____
a) 4 to 6
b) 0 to 10
c) 1 to 10
d) None of the above ANS-A

32) Test design mainly emphasizes all the following except
a) Data planning
b) Test procedures planning
c) Mapping the requirements and test cases
d) Data synchronization ANS-D

33) Deliverables of test design phase include all the following except
a) Test data
b) Test data plan
c) Test summary report
d) Test procedure plan ANS-C

34) Test data planning essentially includes
a) Network
b) Operational Model
c) Boundary value analysis
d) Test Procedure Planning ANS-D

35) Test coverage analysis is the process of
a) Creating additional test cases to increase coverage
b) Finding areas of program exercised by the test cases
c) Determining a quantitative measure of code coverage, which is a
direct measure of quality.
d) All of the above. ANS-D

36) Branch Coverage
a) another name for decision coverage
b) another name for all-edges coverage
c) another name for basic path coverage
d) all the above ANS-A

37) The following example is a
if (condition1 && (condition2 || function1()))
statement1;
else
statement2; (Testing concepts)
a) Decision coverage
b) Condition coverage
c) Statement coverage
d) Path Coverage ANS-D

38) Test cases need to be written for
a) invalid and unexpected conditions
b) valid and expected conditions
c) both a and b
d) none of these ANS-C

39) Path coverage includes
a) statement coverage
b) condition coverage
c) decision coverage
d) none of these ANS-A

40) The benefits of glass box testing are
a) Focused Testing, Testing coverage, control flow
b) Data integrity, Internal boundaries, algorithm specific testing
c) Both a and b
d) Either a or b ANS-C

41) Find the invalid equivalence class for the following test case
Draw a line up to the length of 4 inches
a) Line with 1 dot-width
b) Curve
c) line with 4 inches
d) line with 1 inch. ANS-B

42) Error seeding
a) Evaluates the thoroughness with which a computer program is tested by purposely inserting errors into a supposedly correct

program.
b) Errors inserted by the developers intentionally to make the system
malfunctioning.
c) for identifying existing errors
d) Both a and b ANS-A

43) Which of the following best describes the difference between clear
box and opaque box?
1. Clear box is structural testing, opaque box is Ad-hoc testing
2. Clear box is done by tester, and opaque box is done by developer
3. Opaque box is functional testing, clear box is exploratory testing
a) 1
b) 1 and 3
c) 2
d) 3 ANS-D

44) What is the concept of introducing a small change to the program and having the effects of that change show up in some

test?
a) Desk checking
b) Debugging a program
c) A mutation error
d) Introducing mutation ANS-C

45) How many test cases are necessary to cover all the possible sequences of statements (paths) for the following program

fragment? Assume that the two conditions are independent of each other : – …………
if (Condition 1)
then statement 1
else statement 2
fi
if (Condition 2)
then statement 3
fi
…………
a. 1 test case
b. 3 Test Cases
c. 4 Test Cases
d. Not achievable ANS-B

46) Given the following code, which is true about the minimum number of test cases required for full statement and branch

coverage:
IF P+Q > 100 THEN
Print “Large”
ENDIF
If P > 50 THEN
Print “P Large”
ENDIF
a) 1 test for statement coverage, 3 for branch coverage
b) 1 test for statement coverage, 2 for branch coverage
c) 1 test for statement coverage, 1 for branch coverage
d) 2 tests for statement coverage, 3 for branch coverage
e) 2 tests for statement coverage, 2 for branch coverage ANS-E

47) Given the following:
Switch PC on
Start “outlook”
IF outlook appears THEN
Send an email
Close outlook
a) 1 test for statement coverage, 1 for branch coverage
b) 1 test for statement coverage, 2 for branch coverage
c) 1 test for statement coverage. 3 for branch coverage
d) 2 tests for statement coverage, 2 for branch coverage
e) 2 tests for statement coverage, 3 for branch coverage ANS-B

48) If a candidate is given an exam of 40 questions, should get 25 marks to pass (61%) and should get 80% for distinction,

what is equivalence class?
A. 23, 24, 25
B. 0, 12, 25
C. 30, 36, 39
D. 32, 37, 40 ANS-C

49) Consider the following statements:
i. 100% statement coverage guarantees 100% branch coverage.
ii. 100% branch coverage guarantees 100% statement coverage.
iii. 100% branch coverage guarantees 100% decision coverage.
iv. 100% decision coverage guarantees 100% branch coverage.
v. 100% statement coverage guarantees 100% decision coverage.
a) ii is True; i, iii, iv & v are False
b) i & v are True; ii, iii & iv are False
c) ii & iii are True; i, iv & v are False
d) ii, iii & iv are True; i & v are False ANS-C

50) Which statement about expected outcomes is FALSE?
a) Expected outcomes are defined by the software’s behavior
b) Expected outcomes are derived from a specification, not from the code
c) Expected outcomes should be predicted before a test is run
d) Expected outcomes may include timing constraints such as response times ANS-A

51) Which of the following is not a white box testing?
a) Random testing
b) Data Flow testing
c) Statement testing
d) Syntax testing ANS-D

52) If the pseudo code below were a programming language, how many tests are required to achieve 100% statement coverage?
1. If x=3 then
2. Display_messageX;
3. If y=2 then
4. Display_messageY;
5. Else
6. Display_messageZ;
a. 1
b. 2
c. 3
d. 4 ANS-B

53) Using the same code example as question 17, how many tests are required to achieve 100% branch/decision coverage?
a. 1
b. 2
c. 3 ANS-B
d. 4

54) Which of the following technique is NOT a black box technique?
a) Equivalence partitioning
b) State transition testing
c) LCSAJ
d) Syntax testing ANS-D

55) Given the following code, which is true?
IF A>B THEN
C = A – B
ELSE
C = A + B
ENDIF
IF C = D THEN ANS-B
Print “Error”
ENDIF
a) 1 test for statement coverage, 1 for branch coverage
b) 2 tests for statement coverage, 2 for branch coverage
c) 2 tests for statement coverage, 3 for branch coverage
d) 3 tests for statement coverage, 3 for branch coverage
e) 3 tests for statement coverage, 2 for branch coverage

56) Consider the following:
Pick up and read the news paper
Look at what is on television
If there is a program that you are interested in watching then switch the television on and watch the program
Otherwise
If there a crossword in the news paper then try and complete the crossword
a) SC = 1 and DC = 3
b) SC = 1 and DC = 2
c) SC = 2 and DC = 2
d) SC = 2 and DC = 3 ANS-C

57) The specification: an integer field shall contain values from and including 1 to and including 12 (number of the month)
Which equivalence class partitioning is correct?
a) Less than 1, 1 through 12, larger than 12
b) Less than 1, 1 through 11, larger than 12
c) Less than 0, 1 through 12, larger than 12 ANS-A
d) Less than 1, 1 through 11, and above

58) Analyze the following highly simplified procedure:
Ask: “What type of ticket do you require, single or return?”
IF the customer wants ‘return’
Ask: “What rate, Standard or Cheap-day?”
IF the customer replies ‘Cheap-day’
Say: “That will be £11:20”
ELSE
Say: “That will be £19:50”
ENDIF
ELSE
Say: “That will be £9:75”
ENDIF

Now decide the minimum number of tests that are needed to ensure that all the questions have been asked, all combinations

have occurred and all replies given.
a) 3
b) 4
c) 5
d) 6 ANS-A

verry nicely explained !
thanx a lot sir……

#140 Swetha Sreenivasa

I would like to thank each and every one for the clear explanation. Thank you.

Very nice and Simple Explanation with a good example

#142 Shweta

Very good Explanation & Easy to understand..

#143 Nivi

My question is for the specified range 1-100 we test the values 0,1,2 and 99,100,101 for ECP but what if the range is 0-99999,how am i suppose to use BVA or ECP and is the logic n, n-1,n+1 still applicable?? Plz help me with this!!!

#144 narap

nice

#145 narap

simple clarification

#146 Joydip

Good One

#147 sahim

Thanks 4 providing such a good material…

and also very thankful to kishor, shuhas,vijay and vijetha. they are sharing such a very important knowledge between us..

#148 SAALIM

THANX TO UR COOPERATION ME

#149 Deepu

kilimanjaro

#150 Bikash Jajodia

I have often seen the above example being provided for BVA and EQP.
However, I would like to provide another example that would demonstrate the 2 techniques better.
Let us assume that there is a field called “Age” that has inputs from 1-80.
Based on the age, customer is provided discount on tickets.
1-18: 50%
19-50: 10%
51-80: 40%

Applying BVA, the test cases would be 0, 1, 2, 79, 80, 81 and 1 random number from within the range let’s say it is 45.

Applying EQP, the test cases would be 1 number from each of the classes let’s say,
5 from 1-18 class,
29 from 19-50 class,
72 from 51 to 80 class.

Besides these, applying BVA again, the internal boundaries also should be tested, hence, we should also include 18, 19, 50 and 51 in our test cases.

Thus, overall, test cases should be for 0, 1, 2, 5, 18, 19, 29, 45, 50, 51, 72, 79, 80, 81 (total of 14).

Since the number of test cases is high, we can easily optimize the same and reduce it to the following set:
0, 1, 2, 18, 19, 29, 50, 51, 79, 80, 81 (total of 11).

#151 Bikash Jajodia

Theoretically, we still apply the same logic. But, practically, we have to see what can be tested and what cannot be tested and adapt our test cases accordingly.
For example, there may be a field that says that application may allow upto 9999 accounts to be created. It is practically impossible to create so many accounts and test the limit. In such cases, these techniques cannot be applied.

#152 Shekhar

Can BVA be applied to alphabetic values?If yes , could you please explain with an example?

#153 Viswanathan D

Very good article on Boundary Value Analysis.

Thanks,
Viswa
dviswa29@gmail.com

#154 loser

worst article i have ever read :-(

#155 Sherin

This aritcle is not clear..it explains only the boundary values….. wat abt Equivalence Partioning?

#156 some

Very descriptive

#157 ravi

what value we select in equivalance partioning if value is 150 to 1500

#158 Parag

If a input takes integer value from 1 to 100.
applying equivalence partitioning to above problem we
get following classes.
1 to 100(valid)
less than1(Invalid)
greater than 100(invalid)

as in equivalence partitioning there is no hard and fast rule to select input from partitions.

so here from valid class i take input value (1 ,2 99 ,100)
from invalid class lower than1 takes value(0,-1,50)
from invalid class greater than 100 takes value(101,500)

so by taking all this value together(1,2,99,100,0,-1,50,0,-1,50)
i have covered values which lies on boundary.

so why u need to apply BVA(Boundary Value Analysis).if we can get boundary values applying EP(Equivalence Partitioning). Can anyone explain…?

#159 thiru

How to calculate Cyclomatic complexity for the below code using the formula M=E-N+P. where,
E = the number of edges of the graph
N = the number of nodes of the graph
P = the number of connected components (exit nodes).

Q. 23: The following code snippet reads through a file and determines whether the numbers contained are prime or not.

2 While NOT End of File Do
3 Prime := TRUE;
4 For Holder := 2 TO Val DIV 2 Do
5 if Val – (Val DIV Holder) * Holder= 0 Then
6 Write (Holder, ‘ is a factor of ‘, Val);
7 Prime := FALSE;
8 Endif;
9 Endfor;
10 if Prime = TRUE Then
11 Write (Val, ‘ is prime’);
12 Endif;
14 Endwhile;
15 Write (‘End of run)

#160 arunkamatchi

anybody say about latant bug,and golden bug definition and the differents between then…. Please and thanks in advance…

#161 Satish

Suppose password field allows length of 3 to 9 characters. Then as per BVA we will test for characters having length as 2,3,4 and 8,9,10. Interviewer question was Why to test for 4 and 8 when we already test for 3 and 9, isn’t it time consuming?

#162 pankaj goyal

i want to know that what is the main difference between EP and BVA. that mean which strategy should be perform and why? why these both are different from each other?
any one can explain my problem?

#163 Hansa

Please let me know, how by using a testing technique, we will prepare Test Case for a Field accepting decimal numeric value e.g. “XXXXXXXX.XX”

#164 HDN

Good explaination and really simple to undestand.So in the boundry values how many test cases(minimum) that we have to write according to above eg.????

#165 kur

Can the Equivalence analysis have the following casses added under invalid inputs:

1) input data with letters (a-z),(A-Z),Special characters too??

#166 Aman Saxena

Great Article……… Really very useful

#167 Manpreet

Is test cases are written in a particular report ? if yes tell me how test cases are managed

#168 lakshmi

very good one ,it helped me a lot

#169 Rajesh

Very good article. Really nice one !!!!

#170 law choudhary

BVA IS THE ANALYSIS OF MIN-1,MIN,MAX,MAX+1 IF ANYONE WANT THE FULL EXPLANATION WITH EXAMPLE PLZ TELL ME

#171 law choudhary

EQUIVALENCE PARTIONING IS GIVEN PRESSMAN………IF YOU WANT ANYONE WANTS THE 3 POINTS OF THIS TELL ME I WILL EXPLAIN………..

#172 Karan

good explanation with good example

#173 usha

max
min
max+1
max-1
min+1
min-1

are possible input values for boundary value analysis.

#174 Ravi

Very Useful.simply gud

#175 saurabh

I need details of Decision Table tree and Tracibilty Matrix… please mail me all details with example… @ shahsaurabh1983@gmail.com

#176 Ball

good

#177 kkr

Super..

#178 shivani

can u pls explian the function,procedures in black box testing

#179 Be Modipe

always got lazy when coming to all this but thanx to u guys for opening my mind now i no um gonna show ISTQB wat i got…….thanx for the examples u used,it helped alot,was rili stuck..

#180 Anand

Checking for the nor, max+, max-, min+,min- are the boundary values
Partitioning the inputs based on requirements is equivalence partitions.

Thanks for the clear information abt both techniques.

#181 Chaitali

Explained in such a simple way. Very useful. Thanks a lot… :)

#182 Sagar

We need to check total 6 inputs
n,n-1,n+1,m,m-1,m+1…correct if m wrong

#183 ishu

ya nice vav it s very useful for us
-prince na gethu

#184 ishu

awesomee……………………………………………………..
-prince na gethu

#185 sriram

Hi,

Can anyone tell me how many testcase can we write for the below scenario in Equivalence Partitioning and Boundary Level

Marks – 0-100
Student type — First Time/Repeat
Grade – F, D, C, B, A
First Time
0-40 – F; 41-50-D; 51-60-C; 61-70-B; 71-100-A
Repeat
0-50 – F; 51-60-D; 61-70-C; 71-80-B; 81-100-A

#186 Vikrant

Value Range: 1-100

What is Valid Equivalence Partition and Boundary Value of 1-100 range?

What is invalid Equivalence Partition and Boundary Value of 1-100 range?

#187 anil

When it comes API testing, I do not think this theories really helps always. You will be working with Objects rather than numbers like 1-100. And as an API tester you have the full freedom to go and see the dev code that consumes these input parameters and design your test cases accordingly.

#188 Aparna

Postal rates for ‘light letters’ are 25p up to l0g, 35p up to 50g plus an extra l0p for each additional 25g up to l00g.
Which test inputs (in grams) would be selected using equivalence partitioning?
a. 8,42,82,102
b. 4,15, 65, 92,159
c. 10,50,75,100
d. 5, 20, 40, 60, 80

#189 Thulasiram

Great Going Guys :)

Just a suggestion , nothing Personal on this ..
Testing Techniques are introduced to find the minimal number of test cases that can make full coverage (say optimal coverage) , but i see few Pals going out of the Testing Techniques like (EP , BVA)

Like.,,
to check for no of testcases for a text box accepting values between 1 -100 ,

Note :
the main focus on this is to check how system behaves values between 1 – 100 and the values on the boundaries (this shouldn’t be like what happens if we give charactes , spl chars and symbols , that will be carried in other form of testing like field validation (GUI Testing).

As per EP :
we get 3 clauses ,
100(invalid clause). we take 1 value from each clause to check whether system behaves as supposed and not supposed to work .,

To go for further coverage , we go for Boundary checks
which assures our coverage .

#190 Thulasiram

Some of my comments missing *

As per EP :
we get 3 clauses ,
100(invalid clause). we take 1 value from each clause to check whether system behaves as supposed and not supposed to work .,

To go for further coverage , we go for Boundary checks
which assures our coverage .

#191 Thulasiram

Apologies again :(

different clauses are getting missed
lessthan 1 will be invalid clause
1 to 100 will be a valid clause and greatethan 100 will be a invalid caluse

we take 1 value from each clause to check whether system behaves as supposed and not supposed to work .,

#192 Thulasiram

@Aparna ,

Its a bit confusing question , they didn’t explicitly said about which partition to pick up for the test case design .

Expalnation :
10g 25p
50g 35P
75g 45p
100g 55P

Thing to worry here is if we are going to consider the valid partition of weight (in grams) then u r answer should be “c. 10,50,75,100” which covers all the four cases .

If they are expecting to cover us with , invalid partions then we are in trouble :p we got no option in answers to cover those ( we may get additional 2 testcases for invalid partitions)

#193 Thulasiram

@vikrant ,

1-100
valid partition is 1- 100
invalid partitions 0 , 101 (if its a pure interger)

#194 Geetika

can anyone let me know the difference between boundary value and equivalence classes ?????

#195 suji

i could not understand the BVA..but other one example is good

In Boundary value analysis there are three basic steps to perform this validation:

1) First enter extreme valid values both from lower and upper limit

2) Then decrement by 1 from both upper limit and lower limit and test validation on that data

Test Data = Lower limit -1
Test Data = Upper Limit -1

3) Then increment by 1 from both upper limit and lower limit and test validation on that data

Test Data = Lower limit +1
Test Data = Upper limit +1

#197 Thulasiram

@Geethika ,
Though they sounds similar there is a difference between BVA and EP testing techniques

1. EP(Equivalence partitioning)
finding the partitions or combinations (valid /invalid )

Eg :
To check for the valid and invalid partitions between 10 – 100
Valid partion : 10 – 100
Invalid Partitions : 100
— While preparing the testdata if we select number between 10- 100 , then we are testing with valid data. here system should behave as documented
— If we are selecting value 100 then we are testing with the invalid partition (negative testing) , in this system should have some exception handling (error messages/popups)

2 . BVA(Boundary value analysis) :
Testing with the boundary values

Eg : considering the same example ,
to check with values 10-100
–Valid data : 10 -100 : system going to behave same for all the values from 10 -100 , so we dont test all the values , we just check with 10 and 100(we got 2 testdata)
— Invalid date 100 , so we take 9 and 101(as additional negative testdata) for this system should throw error messages .

Note :
I Know both sounds similar , but we can say Equivalence partitioning is part of BVA , so its upto tested to select the technique for testing .

Like if you are not worried about negative cases , then you can go for EP cases (valid partition).
if you want to test the negative as well then you can go for BVA.

There are multiple external parameters on which we should choose the best technique.like
1. Time
2.Expected Coverage
3.logic complexity etcc..

#198 rehana

#199 Thulasiram

Hi Rehana ,

+1 and -1 is the boundary value for a pure integer .
In your case if 1000 ,
you need to test with
1. 1000 is the positive or valid data , data should be accepted
2. 999,1001 are the invalid values , likely negative testing where values shoulnt be accepted.

Eg : if x + y = 1000 and its already given y = 0
then x should be 1000 is the positive testing

for the values 999,1001 it should get failed.

#200 keshav pav

Defenitly it is best artical wid example ever i seen…..everybody get easily understand

#201 Sechaba

This side is very helpful,i would like to know wich sort of technical questions should you ask during the interview for Test analyst

#202 khan

Can any plz help out with worst test cases on BVA

#203 Amrath

#204 sunil verma

great …the way u express simple and meaningful

#205 roma

hi
>this is roma … i want your help… i want to know the test cases for Microsoft outlook 2007..i hope you will help me..
>i prepared test scenario which i mentioned below:-

>thanks
>
>Ms. Roma
>
>1 Always BCC •Performs a CC or a BCC automatically for every email.
>•Customize the email messages that get CC’ed or BCC’ed.
>2 Attachment Reminder • Check your outgoing email for keywords and prompt you in case you
> forgot to attach a file.
>• Keywords are configurable.
>• Intelligently considers signature files.
>3 Attachment Save •Replaces attachments with links.
>•Reduces Outlook storage spaces.
>•Improve Outlook performance.
>•Delete the attachment when deleting an email.
>4 Duplicate Appointment Remover •Removes duplicate appointments.
>•Customizable
>•Fast
>5 Duplicate Contact Remover •Removes duplicate contacts.
>•Customizable
>•Fast
>6 Duplicate Email Remover •Remove duplicate emails in Microsoft Outlook.
>•Customizable
>•Fast
>7 Duplicate Note Remover •Delete duplicates or move them to a folder.
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#206 Ron

Good post, I have to say the Equivalence Partitioning technique has saved me from writing and executing a large number of unnecessary tests.

#207 minnie

very clear and simple explanation thnku so much

#208 kavita

Hi,
I want to know whether I have written correct ECP and BVA values for the condition if(a>b) and both are of type INT32 .
a>b Valid class
a==b Invalid class
a<b Valid class

and values are like b,b+1,b-1,minium and maximum and in the ECP can we change the both variable value or we should keep one as a constant to have good ECP

Thanks

#209 kavita

Hi,
I want to know whether I have written correct ECP and BVA values for the condition if(a>b) and both are of type INT32 .
a>b Valid class
a==b Invalid class
a<b Invalid class

and values are like b,b+1,b-1,minium and maximum and in the ECP can we change the both variable value or we should keep one as a constant to have good ECP

Thanks

#210 priya

Awesome explanation for Boundary value Analysis and Equivalence Class partitioning. Easy to understand.
Thanks a ton for the clear explanation.

#211 Sudham

Very Useful.. thanks for posting

#212 Manish

Simple & Useful..

#213 Martin

Good one!

#214 shilpa

my question is
what is BVA and ECP value for -1 to 1022 range

#215 Avnish

Don’t Forget “Testing is Context Dependent”.

-2 -1 0 1021 1022 1023

#216 Nava chaithanya

Really its good. .

#217 Sanjay

How to write BVA for Date range .

Suppose a field take data between following date range then how to write BVA

Date: 1 Jan 2014 to 31 March 2014

#218 KANIKA

Dear Frnds

pl help me how to write test cases for regristration form of any website

#219 Prathap Reddy

Nice and Easy to learn….to understand easy…tanKQ…

#220 vishnu shankar

This kind of Articles helps every one especially freshers

#221 Shashank Sissodia

great artical,It makes me to understand very easy.

#222 Rahul

Good article…
Thanks lot

#223 Uma Gupta

Nice article with very gud examples. Thanks a lot to Vijay for the support.

#224 Deepa

Hi,
Can someone help me to write BVA(Boundary Value Analysis) for input field that accepts only 10 digit Phone numbers? What will be the boundary numbers?

#225 Nisarg

Really thanks for the help.. It will be helpful in my mid semester exam..

#226 Rabi

Hello Everybody,
I have one doubt Regarding boundary value analysis and Equivalent class partitioning.
Let I have one Test cases for input box accepting numbers between 1 and 1000.
So as we know through boundary value analysis and Equivalent class partitioning we can check min value i.e. 0,1,2 and max value i.e 999,1000,1001.
But user may give some random number like 55,555555,45566,289 and So on.
So,My doubt is how we can check that number is valid or not ?

#227 Anoop

Thanks for sharing………

#228 Kavita

Nice questions for brushing before exam.

#229 kavita

Hi Friends ,

Could anyone be kind enough to send me questions or dumps with answers for ISTQB Fundamental Certification . I am appearing For ISTQB certification exam next week.

Thanking you all in anticipation.
Kavita

#231 Devaraju

That would be 9 test cases, let me know if it’s not right

#232 vignesh

i have doubt regarding Test Matrices , Test Metrics, & Test matrix can u pls explain tis

#233 srikanth kamera

valuable info

#234 Gustav

So, in the equivalence class test cases for numbers from 1 to 1000, since there are only three test cases, do we also perform only three tests, or do we still need to perform 1000 tests? If we are supposed to perform only three tests, then how can we be sure that every single number gives the same result? Maybe the software has a bug that gives a different result for 99.

#235 Ahmed Raza Siddique

You Rock Dude Awesome

#236 Ravella Baji

Thank you very much,its very helpful one …..!