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Testing of ETL is a key aspect of Data Warehouse, Data Migration and Data Integration projects.
BI Testing is unique because it requires focus on a combination of BI metadata, database queries and data.
Flat files are commonly used for exchanging data between enterprises or between organizations.
Application testing is well documented but often there is little or no testing done for database development.
Data Warehouse testing requires a data-centric testing approach. It consists of ETL testing and BI testing.
Checklist for Data Warehouse testing published by our own (Wayne Yaddow) in IBM Big Data Magazine.