The document discusses white box testing (WBT), which tests the internal structure and workings of an application. WBT involves understanding source code to design test cases that execute all paths and verify expected outputs. Key WBT techniques include control flow testing, data flow testing, branch testing, and path testing. WBT provides advantages like optimizing code and revealing hidden errors, but requires extensive knowledge of the application and may not test all conditions.

2. SOFTWARE
ENGINEERING
WHITE BOX TESTING
Presented by: Aurangzeb
12BS(cs)27
Department of Computer Sciences-QUEST

3. Table of Contents
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White Box testing---Introduction
WBT vs BBT----------pictural representation
Explanations
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WBT Techniques
Formal Examples
Real life examples
Advantages and Disadvantages of WBT
Summary
References
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4. What is White Box Testing?
(WBT)
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White box testing is a process of testing a source
code again and again to check and correct the
bugs present in any code.
White-box testing (also known as clear box
testing, glass box testing, transparent box
testing, and structural testing) is a method of
testing software that tests internal structures or
workings of an application, as opposed to its
functionality (i.e. black-box testing).
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5. white-box testing (IEEE-1990)

Testing that takes into account the internal
mechanism of a system or components.
 (IEEE-1990)
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6. BBT vs WBT
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7. Explanations;
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white-box testing an internal perspective of the
system, as well as programming skills, are used to
design test cases. The tester chooses inputs to
exercise paths through the code and determine the
appropriate outputs. This is analogous to testing
nodes in a circuit, e.g. in-circuit testing (ICT).
White Box Testing (WBT) is also known as CodeBased Testing or Structural Testing. White box testing
is the software testing method in which internal
structure is being known to tester who is going to test
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the software.

8. Continued…
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white-box testing can be applied at
the unit, integration and system levels of
the software testing process, it is usually done at
the unit level.
It can test paths within a unit, paths between units
during integration, and between subsystems
during a system–level test.
Though this method of test design can uncover
many errors or problems, it might not detect
unimplemented parts of the specification or
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missing requirements.

9. Example;
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11. What do you verify in White Box
Testing ?
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In the White box testing following steps are executed
to test the software code:
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Basically verify the security holes in the code.
Verify the broken or incomplete paths in the code.
Verify the flow of structure mention in the specification
document
Verify the Expected outputs.
Verify the all conditional loops in the code to check the
complete functionality of the application.
Verify the line by line or Section by Section in the code &
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cover the 100% testing.

12. WBT Techniques;
White-box test design techniques include:
 Control
flow testing
 Data flow testing
 Branch testing
 Path testing
 Statement coverage
 Decision coverage
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13. Terminologies using WBT;
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White-box testing's basic procedures involve the
understanding of the source code that you are testing
at a deep level to be able to test them
The programmer must have a deep understanding of
the application to know what kinds of test cases to
create so that every visible path is exercised for
testing.
Once the source code is understood then the source
code can be analyzed for test cases to be created.
These are the three basic steps that white-box testing
takes in order to create test cases:
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14. Continued…
Input, involves different types of requirements, functional
specifications, detailed designing of documents, proper
source code, security specifications. This is the preparation
stage of white-box testing to layout all of the basic
information.
 Processing Unit, involves performing risk analysis to guide
whole testing process, proper test plan, execute test cases
and communicate results. This is the phase of building test
cases to make sure they thoroughly test the application the
given results are recorded accordingly.
 Output, prepare final report that encompasses all of the
above preparations and results.

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15. Advantages of WBT;

White-box testing is one of the two biggest testing
methodologies used today. It primarily has three advantages:
 Side effects of having the knowledge of the source code is
beneficial to thorough testing.
 Optimization of code by revealing hidden errors and being
able to remove these possible defects.
 Gives the programmer introspection because developers
carefully describe any new implementation.
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16. Disadvantages of WBT;

Although White-box testing has great advantages, it is not
perfect and contains some disadvantages. It has two
disadvantages:
 White-box testing brings complexity to testing because to be
able to test every important aspect of the program, you must
have great knowledge of the program. White-box testing
requires a programmer with a high-level of knowledge due to
the complexity of the level of testing that needs to be done.
 On some occasions, it is not realistic to be able to test every
single existing condition of the application and some
conditions will be untested.
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17. Summary;

White-box testing is a method of testing the
application at the level of the source code. The
test cases are derived through the use of the
design techniques mentioned above: control
flow testing, data flow testing, branch testing, path
testing, statement coverage and decision
coverage as well as modified condition/decision
coverage. White-box testing is the use of these
techniques as guidelines to create an error free
environment by examining any fragile code.
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18. White Box – summary;
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Statement testing
uses a model of the program’s control flow
it is designed in order to execute all or selected statements of the test
object
Branch/Decision Testing
uses a model of the program’s flow
it is designed in order to execute (each) outcome of all or selected decision
points in a test object
Branch Condition Combination
uses a model of the program flow where each combination of the inputs for
a decision/condition must be tested, in order to check if each branch is
covered
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19. References;
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http://en.wikipedia.org/wiki/White-box_testing
http://www.chaudhary.org/WhiteBox.pdf
http://www.sersc.org/journals/IJSEIA/vol5_no3_2011/1
.pdf
http://ijcsi.org/papers/7-3-1-11-16.pdf
http://www.4shared.com/get/yCrequN8/Software_engi
neering_book.html
http://www.softwaretestingclass.com/white-boxtesting/
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