Integration Test
Integration test occurs when independently designed components are integrated with the rest of the subject system to verify that they interoperate and do not destabilize the system.
In a complex system, integration testing can present a tremendous challenge to fault isolation for several reasons.
Integration testing must accommodate individual component development completion times.
During integration testing, component interfaces may be in a state of flux.
During integration testing, components may not be stable or have unintended affect on other components.
Adding several new components to a build may make problem diagnosis very difficult.
So new component integrations are sometimes staggered to minimize system perturbation.
Integration tests are usually against the use cases or an acceptance test.
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