Developer: when they build the application they also need other application on which his own application is depend. When they test their application they also need a proper result from other depended application. So this developer is responsible for the Integrated testing.

Tester: Either developer do the integrated testing or not. Tester need to test or cross the check all the dependency with other modules. If he doesn't do this then it gives the error at client side and they ask testing is not done completely. So the tester is also responsible for the integrated testing.

Mandeep Sharma