What is Integration Testing?

For all new modules or changes to complex systems, Integration Testing is performed to verify that the software modules interface and perform correctly when combined with each other and/or with hardware, as defined in the Functional/System Design Specification.  In particular, this stage verifies the integration of each modified components with those parts of the system to which they are functional linked

For iterative development, Integration Testing must ensure that a new release integrates fully with previous releases.

This may be accomplished partly in Unit Testing and partly in System Testing and hence this may not be represented as a separate phase.

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