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Integration Testing
Individual software modules are combined and tested as a group. It follows Unit Testing and precedes System Testing. It takes, as its input, modules that have been checked by Unit Testing, groups them in larger aggregates, applies tests defined in an Integration Test Plan and delivers as its output, the integrated system ready for System Testing.

This type of testing is especially relevant to client/server and distributed systems. The purpose of Integration Testing is to detect any inconsistencies between the software units that are integrated together called assemblages or between any of the assemblages and hardware.
 
There are two methods in integration testing
Incremental
Big bang
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