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It ensures that the ETL process functions well with other upstream and downstream processes. A Data warehouse implementation is a collection of many components, and hence integration testing is a must. Typically, system testing only includes testing within the ETL application.

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As a general principle, testing is about risk/reward, which comes down to cost in terms of money/time/resources (people/machines) in various combinations. The test coverage curve will be some sort of …
answered Apr 6 '17 by Marcus D