Yesterday I was thinking about some testing strategies for a little project I’m working on. One idea I had was to test the output of a function when applied to every possible variant of an enum. One way I could implement this is by manually naming every variant of the enum in question – probably while using a macro. However, I am terrible at keeping track of things and I would most likely add a new variant to my enum without updating my tests. I could include in the macro a line of code that matched each variant like this: