Test Drivers are used during Bottom-up integration testing in order to simulate the behaviour of the upper level modules that are not yet integrated. Test Drivers are the modules that act as temporary replacement for a calling module and give the same output as that of the actual product.
Drivers are also used when the software needs to interact with an external system and are usually complex than stubs.
The above diagrams clearly states that Modules 4, 5, 6 and 7 are unavailable for integration, whereas, above modules are still under development that cannot be integrated at this point of time. Hence, drivers are used to test the modules. The order of Integration will be:
4,2 5,2 6,3 7,3 2,1 3,1
+ Firstly, the integration between the modules 4,5,6 and 7 + Test the integration between the module 4 and 5 with Driver 2 + Test the integration between the module 6 and 7 with Driver 3
10 Lectures 1 hours
17 Lectures 1.5 hours
60 Lectures 5 hours
99 Lectures 10 hours