Black Box Testing:
In Black Box
Testing we don’t want to execute the code for finding the defect. Is also known as Behavioral Testing. Black
Box testing method is applicable to all levels of the software testing process
like.
·
Unit Testing
·
Integration Testing
·
User Acceptance Testing
·
System Testing
By using this method we will find errors in
the following categories:
·
Incorrect or Missing Functions
· Behavior errors or performance errors
·
Interface Errors
In Black Box
testing we will use some techniques to find the defects
a.
Boundary Value Analysis Technique (BVT)
b.
Equal Class Partitioning
c.
State Transition Technique
a) Boundary Value Analysis Technique (BVT): It is a
software test design technique. In Boundary Value Analysis Technique we are
trying to test boundary values of the test data. By using this technique we can
prepare accurate test data.
Example: We will consider x and y are the range of
the value. X is the starting value and y
is ending value then, we will try to test by using some conditions
X - Value, y –
Value, x+1 – Value, y+1 – Value, x-1 – Value, y-1 – Value We will try to test
these conditions.
For example we will write test cases for login field:
Requirements are: 1) Login field should accept 6- 12
characters only
S. NO
|
BRS ID
|
Description
|
Test Data
|
Expected Result
|
Actual Result
|
Pass/Fail
|
1
|
1.1
|
Verifying the username filed length
exactly with 6 characters
|
username:
12345y
|
User name field should be accept the
value
|
User name field accepted the value
|
|
2
|
1.1
|
Verifying the username filed length
between 7 to 11 characters
|
user name:
14253yuiqs
|
User name field should be accept the
value
|
User name field accepted the value
|
|
3
|
1.1
|
Verifying the username filed length
exactly with 12 characters
|
User name:
12345y54hber
|
User name field should be accept the
value
|
User name field accepted the value
|
|
4
|
1.1
|
Verifying the username filed length more
than 12 characters
|
User name : 12450@ghjkawe
|
User name field Should not be accept
the value and it will throw the error
|
User field is not accepted the value
and its throwing “ Please enter the character between 6-12 Characters Only”
|
|
5
|
1.1
|
Verifying the username filed length less than 6 characters
|
User name : 150@e
|
User name field Should not be accept
the value and it will throw the error
|
User field is not accepted the value
and its throwing “ Please enter the character between 6-12 Characters Only”
|
|
b) Equal Class Partitioning: In Equal Class
Partitioning class we are dividing test data into different classes. We will
consider alphabets (a, b, c, d...) are one class. And numbers are in one
class(0,1,2,3,4,5,6), and Special
Characters are in one
class(!,@,#,$,%,&,*) . Equal Class Partitioning (ECP) technique will use
full some User Name fields (or) Password fields will accept only one type
characters only.
Requirements
are: 1) Login field accept alpha bate characters
only
2)
Password alpha numeric characters only
S. NO
|
BRS ID
|
Description
|
Test Data
|
Expected Result
|
Actual Result
|
Pass/Fail
|
1
|
1.1
|
Verifying the username filed With
alpha bates
|
User Name : ascdfe
|
User name field should be accept the
value
|
User name field accepted the value
|
|
2
|
1.1
|
Verifying the username filed With
alpha Numeric
|
User Name : adc@123#$
|
User name field Should not be accept
the value and it will throw the error
|
User field is not accepted the value
and its throwing “ Please
enter Characters Only”
|
|
3
|
1.1
|
Verifying the Password filed values
without
entering alpha numeric characters
|
Password: asdcfvr
|
Password field should not be accept the value and it will throw the
error
|
User field is not accepted the value
and its throwing “alpha
numeric characters”
|
|
4
|
1.1
|
Verifying the Password filed values with
entering alpha numeric characters
|
Password: asd@#$4152
|
Password field should be
accept the value
|
Password field is accepted the value
|
|
5
|
1.1
|
Verifying the username filed With
Numeric values
|
User Name: 123456
|
User name field Should not be accept
the value and it will throw the error
|
User field is not accepted the value
and its throwing “ Please
enter Characters Only”
|
|
c)State Translation Technique: In this technique
we are testing how the pages are re-directing form one page to another page.
And how the pages are re-directing form another pages to home page.
Advantages
of Black Box Testing:
1)Testers no needed to know any programing
knowledge
2)Testers are done form the user’s Point of View
3)Test cases can be designed as soon as the
Functional Requirement Specifications are complete
2) White Box Testing:
White Box testing is also known
as “Glass box testing or Structural Testing” .In White Box testing we want to
execute Code for finding the defect. If tester wants to do White Box Testing,
the tester should have knowledge on Coding. In White box testing we need to do
detailed investigation of internal logic and structure of the code. In order to
perform white box testing on an application, the tester needs to possess
knowledge of the internal working of the code
White Box testing Method is applicable to the
following level of the software testing process like
·
Unit Testing
·
Integration Testing
·
System Testing
