30. Application under test | Test app with pytest | understand app | AUT | SUT | Rajiv
The test code we write needs to be able to run the application code. The “application code” is the code we are validating, and it has many names. You may hear it referred to as production code, the application, code under test (CUT), system under test (SUT), device under test (DUT), and so on. For this book, we’ll use the term “application code” if it’s necessary to distinguish the code from the test code.
The “test code” is the code we are writing in order to test the application code. Ironically, “test code” is fairly unambiguous and doesn’t have many names other than “test code.”