Answer Posted / mayank juyal

I am not sure whether you can directly equate Stubs and
Drivers with a Black box or White box or Gray box testing.

But according to me Stubs and Drivers are concepts which
can be part of both of the testing approaches.

As we know that:
Stub is dummy Procedure (Function/Component), which we use
as a replacement of the actual Procedure, when the actual
procedure is not fully developed while testing.

And

Driver is a main Program/Skeleton, whose purpose is to call
a Procedure/Function/Component that is being tested.
Now both of them can be used in Black Box or White Box
testing.

Example:
Black Box:
You are testing usability of a website. There is a web
page, on which clicking ‘Submit’ button navigates to next
web page.
Here in the current web page you have functionality for
inputting a ‘Unique Email ID ‘by clicking ‘Generate’
button, which is a mandatory field and only after
generating it, you will be able to click Submit Button.
Now, developers have not yet written the code for
generating Unique Email ID, so they have created a Stub,
for same functionality which puts a hard coded Email ID for
the same field, when Generate Button is clicked.
So if you take above example you have been using a Stub in
your Back Box testing approach while doing a usability
testing.

Alternatively –

WhiteBox:
If you are a developer/tester, who debug code or do unit
testing, for the same example mentioned above – Here sub
will be function/lines of code written to create that stub.

Regards,
Mayank Juyal

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