blackboxandwhiteboxtesting in software testing.ppt

BLACKBOX TESTING
 In Black Box Testing we just focus on inputs and
output of the software system without bothering
about internal knowledge of the software program.
[Figure of Blackbox Testing]
 The above Black Box executable program can be any
software system you want to test.

BLACKBOX TESTING
 By applying black-box techniques, you derive a set of
test cases that satisfy the following criteria:
 (1) test cases that reduce, by a count that is greater
than one the number of additional test cases that must
be designed to achieve reasonable testing, and
 (2) test cases that tell you something about the
presence or absence of classes of errors, rather than
an error associated only with the specific test at hand.

BLACKBOX TESTING
 Blackbox Techniques/ Methods:
 Equivalence partitioning: It is a software test design
technique that involves dividing input values into valid
and invalid partitions and selecting representative
values from each partition as test data.
 Boundary Value Analysis: It is a software test design
technique that involves determination of boundaries
for input values and selecting values that are at the
boundaries and just inside/ outside of the boundaries
as test data.
 Cause effect graphing: It is a software test design
technique that involves identifying the cases (input
conditions) and effects (output conditions), producing
a Cause-Effect Graph, and generating test cases
accordingly.

WHITEBOX TESTING:
 White Box Testing (also known as Clear Box Testing,
Open Box Testing, Glass Box Testing, Transparent Box
Testing, Code-Based Testing or Structural Testing) is
a software testing method in which the internal
structure/ design/ implementation of the item being
tested is known to the tester.
 White Box Testing is like the work of a mechanic who
examines the engine to see why the car is not moving.
 Using white-box testing methods, you can derive test
cases that
 (1) guarantee that all independent paths within a
module have been exercised at least once

 (2) exercise all logical decisions on their true and
false sides
 (3) execute all loops at their boundaries and within
their operational bounds
 (4) exercise internal data structures to ensure their
validity.
WHITEBOX TESTING:

WHITEBOX TESTING:
[Figure of Whitebox Testing Approach]

WHITEBOX TESTING:
Why and When White-Box Testing:
 White box testing is mainly used for detecting logical
errors in the program code.
 It is used for debugging a code, finding random
typographical errors, and uncovering incorrect
programming assumptions.
 White box testing is done at low level design and
implementable code.
 It can be applied at all levels of system development
especially Unit, system and integration testing.
 White box testing can be used for other development
artifacts like requirements analysis, designing and test
cases.

WHITEBOX TESTING:
Whitebox Testing Techniques:
 Following are Whitebox testing techniques:
 Statement coverage: This technique is aimed at
exercising all programming statements with minimal
tests.
 Branch and decision coverage: This technique is
running a series of tests to ensure that all branches are
tested at least once.
 Tools: An example of a tool that handles branch
coverage testing for C, C++ and Java applications
is TCAT-PATH
 Path coverage: This technique corresponds to testing
all possible paths which means that each statement
and branch is covered.

WHITEBOX TESTING:
[Figure of Path coverage Example]

COMPARISON OF BLACKBOX TESTING AND WHITEBOX TESTING:

blackboxandwhiteboxtesting in software testing.ppt

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