Stubs are dummy modules that are always distinguish as "called programs", or you can say that is handle in integration testing (top down approach), it used when sub programs are under construction.
Stubs are considered as the dummy modules that always simulate the low level modules.
Drivers are also considered as the form of dummy modules which are always distinguished as "calling programs, that is handled in bottom up integration testing, it is only used when main programs are under construction.
Drivers are considered as the dummy modules that always simulate the high level modules.
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