Test Case Designing Techniques

Test Case Design Techniques:

To design better test cases there are three test case design techniques available.

•        Boundary Value Analysis.

•        Equivalence Clause Partition.

•        Error Guessing.

Boundary Value Analysis:

•     Boundary Value Analysis:

•     The process of analyzing the data at boundary levels 

•     There are 6 Boundary Levels.

1) Min       

2) Min – 1  

3) Min + 1        

4) Max  

5) Max – 1  

6) Max + 1

• Example:   

• If there is a requirement such as a user can be granted a loan if

•     Condition – 1:  User age >= 20, User age <= 50.

 Condition – 2:  User Sal >= Rs.20,000, User Sal <= Rs.2,00,000.     

                           

Min	Status		Max
Min = 20	Pass	Pass	Max = 50
Min - 1 = 19	Fail	Pass	Max - 1 = 49
Min + 1 = 21	Pass	Fail	Max + 1 = 51

 

Equivalence Clause Partition

• ECP (Equivalence Clause Partition):

• The process of partitioning / dividing the data between the classes like Valid or Invalid.

• Example:  when there is a requirement such as user name field should accept either alpha or numeric or the combination of alphanumeric

•        (a – z), (A – Z), (0-9), {A-Z}{a-z}{0-9}.

Valid	Status	Invalid	Status
a – z	Pass	Special Chars (*&^%...)	Fail
A – Z	Pass	Function Keys (F1..F12)	Fail
0 – 9	Pass	Blanks, spaces, all zeros	Fail
[A-Z][a-z][0-9]	Pass

Error Guessing

• The process of guessing errors where ever they are required.

• Example: When there is a requirement like password can accept any alphanumeric.

• When we enter special characters in the password field there should be “invalid password”. When you don not enter any value in the password field click again there should be a “Please enter password” message.

 

Error Guessing

• Test Purpose:

• To verify blank data submission on the Login page gives proper validation messages

• Test Steps:

• Without entering User Name and password, click on Sign In Button

• There should be error messages indicating that, username and password are not entered

• Expected Results:

• For blank data submission on the Login page the Login page should give proper validation messages indicating that, username and password are not entered

Posted in: Test Case Designing Techniques