Does anyone have experience in testing "data science workflows". I made up that term because I can't think of anything better to call it. For example, a program

Does anyone have experience in testing "data science workflows". I made up that term because I can't think of anything better to call it. For example, a programmer starts off with some business requirements (that would be written by a business analyst) that might cover rules on which customers should receive marketing newsletters. By SQL wrangling a few different databases using some pretty complicated logic, the programmer arrives at a list of customers that they feel satisfies the business analyst's requirements. Would a tester test that the programmer's code "works" by "unit testing" or should a tester have the knowledge and skills to build their own "independent version" of what the programmer has built and compare results?