The particularity of database unit tests is that not only the parameters of a function, but also the data, which is stored in database tables, can be both the input and the outcome of the module being tested. Moreover, the execution of one test could influence the following tests due to the changes it makes to the data, so it might be necessary to execute the tests in a specific order.
Therefore, the testing framework should be able to insert data into the database, run tests, and then analyze the new data. Furthermore, the testing framework could also be required to manage the transactions in which the tests are executed. The easiest way to do all of that is by writing the tests as SQL scripts. In ...
