What happens when the unit test of software components works perfectly? Have you ever wondered why the 100% pass report for unit tests does no good to components when integrated and verified as one unit? Integration tests undergoing spontaneous failure do not reflect that the failure point lies within the units but somewhere where the units interact.
What Is Integration Testing?
Integration testing consists of testing around the interfaces to check the data flow between several modules of software without disturbing the functionalities of the modules.