I have an application in ASP.Net, with web forms, but without any tests, and I would like to do them, now, unit tests would not be worth me since, it has many procedures that use up to 10 different tables with inner join and the paradigm is a mixture between structured programming and object oriented, well, arrived at this point of project decontrol without any type of test, the question is: What minimal tests should be done? Would it be advisable to try integration tests?
Greetings and thanks