state to the world. In some cases it may be useful to make a unittest class a friend of the class it tests. 29 Friends extend, but do not break, the encapsulation boundary of a class. In some cases this undesirable, particularly in widely-used or mature code. RTTI can be useful in some unit tests. For example, it is useful in tests of factory classes where the test has to verify that a newly created object has license boilerplate. File comments describe the contents of a file. If a file declares, implements, or tests exactly one abstraction that is documented by a comment at the point of declaration, file comments

statements 5. Function definitions 6. Executed statements, if applicable (e.g., print, plot) Unit tests should go in a separate file named originalfilename_test.R. Commenting Guidelines Comment your code = TRUE) BAD: PredictCTR <- function(query, property, num.days, show.plot = TRUE) Ideally, unit tests should serve as sample function calls (for shared library rou- tines). Function Documentation Functions

as functions. Decora- tor pydoc should clearly state that the function is a decorator. Write unit tests for decorators. Avoid external dependencies in the decorator itself (e.g. don’t rely on files, sockets functionality. The main functionality should be in a main() function. In Python, pydoc as well as unit tests require modules to be importable. Your code should always check if __name__ == '__main__' before executing

Graz University of Technology, WS 2021/22 Types of Experiments  #1 Exploratory Experiments  Tests for functional correctness  Unstructured experiments for initial feedback  eval feasibility  #2

it's not numeric; that's fine, just continue } return handleTextResponse(response); Exception: In tests, a caught exception may be ignored without comment if its name is or begins with expected. The following