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What is driver and stub? where it is used, in top down or
bottom up approach?

Question Posted / varsha b

Answer Posted / varsha b

Driver and stub is used in integration testing.

Driver is used in bottom up approach of integration
testing.driver calls the function to be tested.

Stub is used in top down approach of integration
testing.stub is called by the function to be tested.It is a
piece of code which stimulates the activity of other module
in system.

E.g. System consist of modules A,B and C.
Development of module A and B is done.Now we cant afford to
wait till the time module C is ready.In this case we can
develop dummy of module c which will stimulate the activity
of module c in system and we can continue with our
integration testing.Here dummy of module C is stub.When we
will connect all three modules to ensure they function
properly then it is called as driver.

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