·
It is the way of
replacing a hard coded value in the script with a parameter which represents a
list of values.
· VuGen generates a script that contains the
actual values used during recording and during script enhancement phase test
engineer has to replace the recorded values with parameters is known as
parameterizing the script.
Objectives
of parameterization:
· One
of the main objective of parametrization is to simulate real user
behavior while running the test and we also use this to solve below problem
·
Solve
Date constraints that may occur during playback
1. Eg: When Second Virtual User accessing
the Application
user may fail because of the 2/14/99 was yesterday!]
·
Solve
data caching that may occur during playback
1. Eg: When Second Virtual User accessing the
Application, user will get data from
Cache
·
Solve
unique constraints that may occur during playback
Eg: Order number 1234 is already here
·
Solve
data dependency that may occur during playback
·
Emulate
real user activity
- Exercise the server (Some
times when we are searching with same keyword, the request will not go to
database and it will get the data from the webserver cache and it will not
exercise the server. Parameterization will solve this problem)
How to create Parameters:
·
Right click on the value and select “Replace with parameter” where we need
to execute with different set of values.
·
On the new window opened just give the Parameter name as user defined variable
and Parmeter typeàselect
any one from the drop down and Original Value will be default value and click
on properties
·
After clicking on properties new window
will be opened then click on Edit with
notepad button and enter some list of values.
Note: After entering values in notepad keep the
cursor in new line and save the notepad and close it.
·
After entering the different set of values
we have to customize the parameter properties to execute the script as user’s
perspective.
Parameter Customization:
1. Select
Columnà By Number
à
By Name
These values are used when we have multiple
columns in the same table with the same parameter type. We can select for each
parameter by number as column number or by name as column name.
2. File
Formatà Column Delimiter
à
First Data Line
Column
Delimiter drop down has values Comma,Tab,Space which are used to separate
multiple columns.
First
Data Line is a number which it uses that number row data at the time of
execution. For eg: if you increase the number to 2 by using up button then the
execution starts from 2nd row data.
3. Select
Next Row à Sequential
à
Random
à
Unique
Update
Value on à Each Iteration
à Each Occurrence
à Once
If
you select Select Next Row as Sequential and Update Value On as Each iteration
then the users will execute the data sequentially for each iteration.
Click
on close button and press CTRL+L buttons then parameter properties window will
open with all parameters in left side and right side parameters data window.
If
you click on Simulate Parameter button
and then enter the iterations in check box and then click on simulate button
then we will get the user behavior when the time of execution how the
parameters will pass to the vusers.
If
you select Update value on as Each Occurrence we can not simulate the
parameter.
If
you select Update value on as Once then the vuser will take only one set of
data for all vusers. For ex: In the above snapshot we will get jojo and bean
for each and every vuser we execute.
If
you select Select Next Row as Random and Update value on as Each iteration then
the user will pick random data for each and every iteration. At that we have to
select for one parameter these values and select Same line as that parameter
name for remaining parameters
For
Ex: If we select RandomàEach iteration for
Username then we have to select Same line as username for password.
If
you select Select Next Row as Unique and Update value on as Each Iteration or
Each Occurrence then automatically When
Out of Values and Allocate Vuser
values in the controller will be enabled.
When
Out Of Valuesà Abort Vuser
à Continue in a cyclic manner
à
Continue with last value
Allocate
Vuser values in the controller(Radio Buttons)
Automatically allocate block size
Allocate ______ values for each vuser
If
you have values less than vusers at that time we have to select UniqueàEach
IterationàAbort Vuser then
what ever the users extra are aborted from the execution.
OR
We
can select UniqueàEach IterationàContinue
in a cyclic manner
OR
We
can select UniqueàEach IterationàContinue
with last value
And
we can select any of the two radio buttons for Allocate vuser values in the
controller in the above three different cases
If
you select Uniqueà Each Occurrence
only
Allocate ______ values for each vuser
will be enabled for all the three cases
And
you can click on Simulate Parameter button for each and every different options
customized to view how the vuser behavior.
If
you select Uniqueà Once all the
vusers will execute with one set of data.
Once parameterization is
done click on close button. Test the data execution procedure in the form of
iterations in VUGen.
Posted by: Sandeep Yalamanchali
