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How do we test ETL pipelines? Part one unit tests

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Why do we bother testing? Testing isn’t an easy thing to define, we all know we should do it, when something goes wrong in production people shout and ask where the tests were, hell even auditors like to see evidence of tests (whether or not they are good isn't generally part of an audit) . What do we test, how and why do we even write tests? It is all well and good saying “write unit tests and integration tests” but what do we test?

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