Topic: Data Flow Testing

Message

   Data Flow Testing
First, a
proper data flow diagram like control flow(see basis path flow) is
drawn. Then selects test paths according to the location of definitions
and use of variables. Any variables that have been defined in any
program behaves in the following way:
D: define the variable, normally defined in declarative section,
U: use the variables which is defined earlier, in the program.
K: kill the variable, which is another state of the variable at any time of the execution of the program. 
Any
variable that is part of the program will undergo any of the above
state. However, the sequence of states is important. We can avoid
following anomalies during the program execution:
•   DU: Normal,
•   UK, UU: Normal,
•   DD: Suspicious
•   DK: Probable bug
•   KD: Normal
•   KK: Probable bug
•   KU: bug
•   UD: Normal
For example, 
DU:
Normal means a variable is defined first and then used in the program
which is normal behavior of the data flow in the program. 
DK:
Probable bug means a variable is defined and then killed before using
in the program. This may be bug as why the variable is defined and
killed with out using in the program.

Author	Message
tanushree Senior Member Joined: 04Apr2007 Online Status: Offline Posts: 2160	Topic: Data Flow Testing Posted: 18Oct2007 at 1:01am
	Data Flow Testing First, a proper data flow diagram like control flow(see basis path flow) is drawn. Then selects test paths according to the location of definitions and use of variables. Any variables that have been defined in any program behaves in the following way: D: define the variable, normally defined in declarative section, U: use the variables which is defined earlier, in the program. K: kill the variable, which is another state of the variable at any time of the execution of the program. Any variable that is part of the program will undergo any of the above state. However, the sequence of states is important. We can avoid following anomalies during the program execution: • DU: Normal, • UK, UU: Normal, • DD: Suspicious • DK: Probable bug • KD: Normal • KK: Probable bug • KU: bug • UD: Normal For example, DU: Normal means a variable is defined first and then used in the program which is normal behavior of the data flow in the program. DK: Probable bug means a variable is defined and then killed before using in the program. This may be bug as why the variable is defined and killed with out using in the program. Post Resume: Click here to Upload your Resume & Apply for Jobs

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