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I would term it: Data Validation or Data Transformation Validation You are validating that the data has been transformed correctly.
Going by "Integrity = Validity + Completeness", I use the following terminology: Data validity testing - checking that all of the data you have is correct Data integrity testing - checking that all of the data you have is correct and all of the data is there Although the previous citation uses validity and completeness in the context of relational ...
I would consider this to be a set of unit tests. For a given piece of data you want to apply the transformation and then validate that the results are as expected. I would expect there to a number of these tests handling the various different cases.
This type of testing is known an: Extract Transform Load .. or ETL testing for short. ref: ETL testing- checklist for testing
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