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Stubs and Drivers The concept of Stubs and Drivers are mostly used in the case of component testing. Component testing may be done in isolation with the rest of the system depending upon the context of the development cycle. Stubs and drivers are used to replace the missing software and simulate the interface between the software components in a simple manner. Suppose you have a function (Function A) that calculates the total marks obtained by a student in a particular academic year. Suppose this function derives its values from another function (Function b) which calculates the marks obtained in a particular subject. You have finished working on Function A and wants to test it. But the problem you face here is that you can't seem to run the Function A without input from Function B; Function B is still under development. In this case, you create a dummy function to act in place of Function B to test your function. This dummy function gets called by another function. Su...