Thread: need Boundary Value analysis explaination with example

Hi,

How do you do BVA for range between 10-20?

This question was posed to me by a inteviewer. As per theory, i told
him 9,10,11 (min-1,min,min+ 1)and 19,20,21(max- 1,max,max+ 1)
values will be tested.Then he questioned the rationale behind testing
11 and 19 .he told me that if 11 passes surely 19 too would pass.for
which i was unable to reply.

Friendz,can anyone explain BVA clearly?????
Any docs on this subject would be very helpful.

Thanx,
vb

Can you give me some examples with answers, as to how to identify the number of test cases to write w.r.t to EP and BVA?

Originally Posted by jayanthisundar

Can you give me some examples with answers, as to how to identify the number of test cases to write w.r.t to EP and BVA?

hi iam chandu i will give my idea about ecp and bva this may help u i feel so!
example name:5 to 30 characters and name contains only alphabetics

valid partition :5 to 30 characters
invalid partition:less than 5 characters
and greater than 30characters
valid boundary:5
30
invalid boundary:4
31

Hi

Boundary value analysis is a software testing design technique in which tests are designed to include representatives of boundary values. The test cases are developed around the boundary conditions. One common example for this technique can be, if a text box (named username) supports 10 characters, then we can write test cases which contain 0,1, 5, 10, >10 characters.

Thought it may be useful

Regards
Dwebb

int liability (int age, char sex,boolean married)
int premium=500;
if ((age<25) && (sex=='M') && (!married))
{
premium = premium +1500;
}
else
{
if (married || sex=='F')
{
premium= premium -200
}
if ((age>45) &&(age<65)
{
premium = premium -100
}
return premium;
}

hello i need help i want some test cases for this problem kindly help me thanks in advance
boundary value analysis
equivalence partitioning

hi,

BVA nothing But checking the values at boundery levels
i.e just checking +1 max value and -1 min value

Ex: login window of any application
It contains Username and Password
Username accepts Only accepts 4-15 characters
In this we check username by giving 3 characters and 16 characters
this is an example of BVA

Would you not also add a test to cover an invalid character such as A or $? so in total making 7 tests?

Hello.
The answer provided before seems to be incomplete. However, if you investigate the function in more depth you will find that the boundary value is not only about the age but also related to the function inputs. Furthermore, if you need to investigate in a further depth you will consider each of the if statement parameter's boundary value as well.

In order to assist your answer, i think that you need to include these sets to the aforementioned answers.

Classes that generates premium " Affect the Premium Value" are :
{24, m, ! married}, {age=?, f, ! married} , {age=?, f, married},
{25, m, married} , {24, m, married} , {age>45, m, married},
{45
The classes that does not generate premium "Affect the premium value" are:
{25<=Age<=45, m, ! married}.
{65,m,!married}.

The boundary value analysis of these values is can be separated into three main categories, especially as there are three main inputs for the function and these inputs are use is interchanging depending on the condition stated in the if functions. However, the followings are the boundary values for the three main inputs:

Martial Status : {Married, ! Married}
Sex/Gender : {M,F}
Age :
{24,25,26,} For the first and second condition.
{44,45,46,64,65,66} illustrated from the last condition and the return statement.

This will guarantee you a test with a full coverage of the function using these techniques. If you count on your answer this will produce a shallow test and weak test.

I hope that i am not mistaken, after all i am just a human. I also appreciate your answer. I wouldn't have compiled the solution without seeing the fault of your answers

Originally Posted by rockbalas

Hi,

10-20 is the equivalence class or valid partition. As per the Equivalence partitioning, you will have to consider conditions which meet criteria and that dont. Therefore As per Equivalence Partitioning, The values between 10 and 20 is valid equivalence class. There are two invalid equivalence class which is 1) values <10 and 2) Values >20. You could choose any one value to satisfy the test case for Equivalence partitioning.

Boundary value Analysis surfaces (surrounding boundary) close values to partition. Therefore your boundary at 10 would be 9 and 11.
Boundary at 20 would be 19 and 21 but 19 belongs to valid equivalence class which has been reasonably assumed to be tested out by evaluating 11, if you chose 11 from the values between 10 and 20. Therefore your Boundary value analysis values are 9,11,21.

Sorry, it is actually
9,10,20,21 values.

BVA tests the boundaries of Equivalence Partition.

Hi guys..
Here I am giving brief about BVA :
In the general application of Boundary Value Analysis can be done in a uniform manner. The basic form of implementation is to maintain all but one of the variables at their nominal (normal or average) values and allowing the remaining variable to take on its extreme values. The values used to test the extremities are:
• Min- = Minimal
• Min+ = - Just above Minimal
• Nom = - Average
• Max-= Just below Maximum
• Max = Maximum
Some Important examples
To be able to demonstrate or explain the need for certain methods and their relative merits I will introduce two testing examples proposed by P.C. Jorgensen [1]. These examples will provide more extensive ranges to show where certain testing techniques are required and provide a better overview of the methods usability.

1. The Next Date problem

The Next Date problem is a function of three variables: day, month and year. Upon the input of a certain date it returns the date of the day after that of the input. The input variables have the obvious conditions:
1 ≤ Day ≤ 31.
1 ≤ month ≤ 12.
1812 ≤ Year ≤ 2012.
(Here the year has been restricted so that test cases are not too large). There are more complicated issues to consider due to the dependencies between variables. For example there is never a 31st of April no matter what year we are in. The nature of these dependencies is the reason this example is so useful to us. All errors in the NextDate problem are denoted by “Invalid Input Date.”

2. The Triangle problem

In fact the first introduction of the Triangle problem is in 1973, Gruenburger. There have been many more references to this problem since making this one of the most popular example to be used in conjunction with testing literature.
The triangle problem accepts three integers (a, b and c)as its input, each of which are taken to be sides of a triangle. The values of these inputs are used to determine the type of the triangle (Equilateral, Isosceles, Scalene or not a triangle).
For the inputs to be declared as being a triangle they must satisfy the six conditions:
C1. 1 ≤ a ≤ 200.
C2. 1 ≤ b ≤ 200.
C3. 1 ≤ c ≤ 200.
C4. a < b + c.
C5. b < a + c.
C6. c < a + b.
Otherwise this is declared not to be a triangle.
The type of the triangle, provided the conditions are met, is determined as follows:
1. If all three sides are equal, the output is Equilateral.
2. If exactly one pair of sides is equal, the output is Isosceles.
3. If no pair of sides is equal, the output is Scalene.