Integration Testing

In this the units or modules are combined and tested as a group.
Modules are typically code modules, individual applications, client and server applications on a network, etc. Integration Testing follows unit testing and precedes system testing. There are two ways integration is performed. It is called Pre-test and Pro-test.
1) Pre-test:
The testing performed in Module development area is called Pre-test. The Pre-test is required only if the development is done in module development area.
2) Pro-test:
The Integration testing performed in baseline is called pro-test. The development of a release will be scheduled such that the customer can break down into smaller internal releases.